<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2021 Workiva-->
<!--r:18240810-a83b-4a4e-8e53-ef584e733496,g:12b49ddd-8901-4d4e-84dd-378c06ce12e3-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:roleRef roleURI="http://www.leidos.com/role/Cover" xlink:type="simple" xlink:href="ldos-20210101.xsd#Cover"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/Cover" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/CONSOLIDATEDBALANCESHEETS" xlink:type="simple" xlink:href="ldos-20210101.xsd#CONSOLIDATEDBALANCESHEETS"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/CONSOLIDATEDBALANCESHEETS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_5a94e9fb-c270-4b9c-b3f3-ddd835315389" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockValue_edae876c-c75a-450d-84d6-d9b67dc4d68f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PreferredStockValue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_5a94e9fb-c270-4b9c-b3f3-ddd835315389" xlink:to="loc_us-gaap_PreferredStockValue_edae876c-c75a-450d-84d6-d9b67dc4d68f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValue_5525ac6c-fb5d-46f2-a392-2081ce966b4b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonStockValue"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_5a94e9fb-c270-4b9c-b3f3-ddd835315389" xlink:to="loc_us-gaap_CommonStockValue_5525ac6c-fb5d-46f2-a392-2081ce966b4b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapital_6e24fd87-e7cc-4990-bdf5-6232c19223f0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AdditionalPaidInCapital"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_5a94e9fb-c270-4b9c-b3f3-ddd835315389" xlink:to="loc_us-gaap_AdditionalPaidInCapital_6e24fd87-e7cc-4990-bdf5-6232c19223f0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_cd460cf8-4877-47ad-99e5-c06303b33907" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_5a94e9fb-c270-4b9c-b3f3-ddd835315389" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_cd460cf8-4877-47ad-99e5-c06303b33907" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_b2ee4ef6-9efb-4c68-945f-660f594adda2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_5a94e9fb-c270-4b9c-b3f3-ddd835315389" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_b2ee4ef6-9efb-4c68-945f-660f594adda2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_aee87951-04bf-482a-9e11-0ac694743f7b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_ed7c6ffb-5a8d-4393-b881-316f35e1c765" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquity"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_aee87951-04bf-482a-9e11-0ac694743f7b" xlink:to="loc_us-gaap_StockholdersEquity_ed7c6ffb-5a8d-4393-b881-316f35e1c765" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterest_7d1b4592-6b24-494c-9bd6-a6c546792f17" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_MinorityInterest"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_aee87951-04bf-482a-9e11-0ac694743f7b" xlink:to="loc_us-gaap_MinorityInterest_7d1b4592-6b24-494c-9bd6-a6c546792f17" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_cb7e4139-9b23-4a94-b7d7-88bf041a4406" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_6c8e73d0-5d77-4394-a4f6-91caa6f96afa" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_cb7e4139-9b23-4a94-b7d7-88bf041a4406" xlink:to="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_6c8e73d0-5d77-4394-a4f6-91caa6f96afa" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_3f90e425-197b-41b2-a20c-713abaf9e8f9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EmployeeRelatedLiabilitiesCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_cb7e4139-9b23-4a94-b7d7-88bf041a4406" xlink:to="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_3f90e425-197b-41b2-a20c-713abaf9e8f9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtCurrent_a998409d-6321-4cdd-a53a-523c1345a1b7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtCurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_cb7e4139-9b23-4a94-b7d7-88bf041a4406" xlink:to="loc_us-gaap_DebtCurrent_a998409d-6321-4cdd-a53a-523c1345a1b7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_7e0f006c-e228-44fc-a839-e9b2a67df188" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Assets"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_300479bb-be7b-4f64-b1ee-1dc5f3ffebcf" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Goodwill"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_7e0f006c-e228-44fc-a839-e9b2a67df188" xlink:to="loc_us-gaap_Goodwill_300479bb-be7b-4f64-b1ee-1dc5f3ffebcf" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_e8b48d3e-570c-4696-8811-f80ad753f34f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_7e0f006c-e228-44fc-a839-e9b2a67df188" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_e8b48d3e-570c-4696-8811-f80ad753f34f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_64222da0-61ca-4304-b2ed-c767e0d014cf" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_7e0f006c-e228-44fc-a839-e9b2a67df188" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_64222da0-61ca-4304-b2ed-c767e0d014cf" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_0f7923cc-38e1-4766-8811-39cd9c60917f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherAssetsNoncurrent"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_7e0f006c-e228-44fc-a839-e9b2a67df188" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_0f7923cc-38e1-4766-8811-39cd9c60917f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_095785b2-a063-4319-8b17-6b20112ff720" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_7e0f006c-e228-44fc-a839-e9b2a67df188" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_095785b2-a063-4319-8b17-6b20112ff720" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_4fd0eaeb-4bda-4da3-be49-83c98be2734c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AssetsCurrent"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_7e0f006c-e228-44fc-a839-e9b2a67df188" xlink:to="loc_us-gaap_AssetsCurrent_4fd0eaeb-4bda-4da3-be49-83c98be2734c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_fb5fc548-0a71-432f-9ac9-c5d365805fb4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_66b90f24-f4f6-4f5e-8744-83d03020e1a3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredIncomeTaxLiabilitiesNet"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_fb5fc548-0a71-432f-9ac9-c5d365805fb4" xlink:to="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_66b90f24-f4f6-4f5e-8744-83d03020e1a3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_969a5d4c-4647-49e9-83ff-598c8fc8b8e5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_fb5fc548-0a71-432f-9ac9-c5d365805fb4" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_969a5d4c-4647-49e9-83ff-598c8fc8b8e5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingencies_3903d863-de9c-48e1-a4a8-a8d0fb4f1c80" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommitmentsAndContingencies"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_fb5fc548-0a71-432f-9ac9-c5d365805fb4" xlink:to="loc_us-gaap_CommitmentsAndContingencies_3903d863-de9c-48e1-a4a8-a8d0fb4f1c80" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_8a0c0b4b-79f5-4e64-b795-6d53bd9503cb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquity"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_fb5fc548-0a71-432f-9ac9-c5d365805fb4" xlink:to="loc_us-gaap_StockholdersEquity_8a0c0b4b-79f5-4e64-b795-6d53bd9503cb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterest_289c7bc0-d2ad-4ac1-9e55-466cc47c9a6c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_MinorityInterest"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_fb5fc548-0a71-432f-9ac9-c5d365805fb4" xlink:to="loc_us-gaap_MinorityInterest_289c7bc0-d2ad-4ac1-9e55-466cc47c9a6c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_be8255a5-bc6d-405d-bae4-b0f7e5b3d38c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_fb5fc548-0a71-432f-9ac9-c5d365805fb4" xlink:to="loc_us-gaap_LiabilitiesCurrent_be8255a5-bc6d-405d-bae4-b0f7e5b3d38c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_283ec751-49d7-42f2-88ce-ca80cc850736" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligations"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_fb5fc548-0a71-432f-9ac9-c5d365805fb4" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_283ec751-49d7-42f2-88ce-ca80cc850736" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_6f98a265-3c89-4ac2-8e3e-561dc2a84d44" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_fb5fc548-0a71-432f-9ac9-c5d365805fb4" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_6f98a265-3c89-4ac2-8e3e-561dc2a84d44" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_83217f7c-90d0-48f1-b200-8977a670233d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AssetsCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsCurrent_37c8ff8b-64f0-487a-b9aa-bca1eacea5e2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherAssetsCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_83217f7c-90d0-48f1-b200-8977a670233d" xlink:to="loc_us-gaap_OtherAssetsCurrent_37c8ff8b-64f0-487a-b9aa-bca1eacea5e2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryNet_2ec6a9c9-2c34-414a-9d91-2ba2084c77f4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InventoryNet"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_83217f7c-90d0-48f1-b200-8977a670233d" xlink:to="loc_us-gaap_InventoryNet_2ec6a9c9-2c34-414a-9d91-2ba2084c77f4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivablesNetCurrent_7f6cab5c-5bc4-43e4-a4fc-47f236ddbb5c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ReceivablesNetCurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_83217f7c-90d0-48f1-b200-8977a670233d" xlink:to="loc_us-gaap_ReceivablesNetCurrent_7f6cab5c-5bc4-43e4-a4fc-47f236ddbb5c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_3f5767ae-60e1-4e72-b4c6-21b43ea2a7c4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_83217f7c-90d0-48f1-b200-8977a670233d" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_3f5767ae-60e1-4e72-b4c6-21b43ea2a7c4" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/CONSOLIDATEDBALANCESHEETSParenthetical" xlink:type="simple" xlink:href="ldos-20210101.xsd#CONSOLIDATEDBALANCESHEETSParenthetical"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/CONSOLIDATEDBALANCESHEETSParenthetical" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/CONSOLIDATEDSTATEMENTSOFINCOME" xlink:type="simple" xlink:href="ldos-20210101.xsd#CONSOLIDATEDSTATEMENTSOFINCOME"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/CONSOLIDATEDSTATEMENTSOFINCOME" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_dd1c3c74-9272-48f8-894d-f1e3ebb8f244" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_AcquisitionIntegrationAndRestructuringCosts_109c7789-b4a8-4541-b52b-eac3133f499e" xlink:href="ldos-20210101.xsd#ldos_AcquisitionIntegrationAndRestructuringCosts"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_dd1c3c74-9272-48f8-894d-f1e3ebb8f244" xlink:to="loc_ldos_AcquisitionIntegrationAndRestructuringCosts_109c7789-b4a8-4541-b52b-eac3133f499e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_AccountsReceivableCreditLossExpenseAndRecoveriesNet_c701beaa-498b-42b2-bfc8-de8894dc373b" xlink:href="ldos-20210101.xsd#ldos_AccountsReceivableCreditLossExpenseAndRecoveriesNet"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_dd1c3c74-9272-48f8-894d-f1e3ebb8f244" xlink:to="loc_ldos_AccountsReceivableCreditLossExpenseAndRecoveriesNet_c701beaa-498b-42b2-bfc8-de8894dc373b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromEquityMethodInvestments_92b0ad73-7edf-4025-8c87-157a7c985243" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeLossFromEquityMethodInvestments"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_dd1c3c74-9272-48f8-894d-f1e3ebb8f244" xlink:to="loc_us-gaap_IncomeLossFromEquityMethodInvestments_92b0ad73-7edf-4025-8c87-157a7c985243" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_8ae0c3f9-ccd0-4434-b045-a3cbf8b1c6cb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SellingGeneralAndAdministrativeExpense"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_dd1c3c74-9272-48f8-894d-f1e3ebb8f244" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_8ae0c3f9-ccd0-4434-b045-a3cbf8b1c6cb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfRevenue_88743820-d161-43d6-ac19-b45634e0b276" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CostOfRevenue"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_dd1c3c74-9272-48f8-894d-f1e3ebb8f244" xlink:to="loc_us-gaap_CostOfRevenue_88743820-d161-43d6-ac19-b45634e0b276" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetImpairmentCharges_30e1f379-41c5-471a-85cf-39964f793dc4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AssetImpairmentCharges"/>
    <link:calculationArc order="6" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_dd1c3c74-9272-48f8-894d-f1e3ebb8f244" xlink:to="loc_us-gaap_AssetImpairmentCharges_30e1f379-41c5-471a-85cf-39964f793dc4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_f15eb248-68ad-420c-85a1-8bcb9b086351" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Revenues"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_dd1c3c74-9272-48f8-894d-f1e3ebb8f244" xlink:to="loc_us-gaap_Revenues_f15eb248-68ad-420c-85a1-8bcb9b086351" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_ef4b1262-740c-459d-884e-e0262b0fb4ae" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetIncomeLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_7aa0c5bc-e5a2-480f-8523-6e03ae5d5e87" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_ef4b1262-740c-459d-884e-e0262b0fb4ae" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_7aa0c5bc-e5a2-480f-8523-6e03ae5d5e87" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_bed35e17-0c96-4223-b212-6170ecea599a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProfitLoss"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_ef4b1262-740c-459d-884e-e0262b0fb4ae" xlink:to="loc_us-gaap_ProfitLoss_bed35e17-0c96-4223-b212-6170ecea599a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_2d14d78f-8935-4e6e-bb3f-0844e0b6deb4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_c5cc1efe-7db6-4585-8548-be0450219cfc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_2d14d78f-8935-4e6e-bb3f-0844e0b6deb4" xlink:to="loc_us-gaap_OperatingIncomeLoss_c5cc1efe-7db6-4585-8548-be0450219cfc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_d9282b69-18b7-4cbf-92af-11aedd516a11" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_2d14d78f-8935-4e6e-bb3f-0844e0b6deb4" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_d9282b69-18b7-4cbf-92af-11aedd516a11" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeExpenseNet_c308782e-cb57-497a-88fa-3269e04a4cb0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestIncomeExpenseNet"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_2d14d78f-8935-4e6e-bb3f-0844e0b6deb4" xlink:to="loc_us-gaap_InterestIncomeExpenseNet_c308782e-cb57-497a-88fa-3269e04a4cb0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_23d7fe52-cf00-4c9e-89b5-ac7f97a32a78" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProfitLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_6684bc94-a11b-4bdf-b190-c482337e700d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ProfitLoss_23d7fe52-cf00-4c9e-89b5-ac7f97a32a78" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_6684bc94-a11b-4bdf-b190-c482337e700d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_4d638b22-ccfe-4eeb-bad4-0c243ca0c773" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ProfitLoss_23d7fe52-cf00-4c9e-89b5-ac7f97a32a78" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_4d638b22-ccfe-4eeb-bad4-0c243ca0c773" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME" xlink:type="simple" xlink:href="ldos-20210101.xsd#CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_61bf6c61-8072-428b-ae23-8801e3259ff9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_977dc17d-0c62-4442-93f7-d287ed61f746" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_61bf6c61-8072-428b-ae23-8801e3259ff9" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_977dc17d-0c62-4442-93f7-d287ed61f746" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax_ef29504f-3fff-4232-82f3-b98c0ddd75a5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_61bf6c61-8072-428b-ae23-8801e3259ff9" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax_ef29504f-3fff-4232-82f3-b98c0ddd75a5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax_8246aa53-8895-403a-ac1f-91b8e6a7d1b5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_61bf6c61-8072-428b-ae23-8801e3259ff9" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax_8246aa53-8895-403a-ac1f-91b8e6a7d1b5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_58548d02-c508-4850-8e7b-6ea61bcb80a1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_e8f11304-d012-4a35-aae7-55f27a02c833" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_58548d02-c508-4850-8e7b-6ea61bcb80a1" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_e8f11304-d012-4a35-aae7-55f27a02c833" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_a9d277af-92b3-4e9b-94e0-4e363da220a7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_58548d02-c508-4850-8e7b-6ea61bcb80a1" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_a9d277af-92b3-4e9b-94e0-4e363da220a7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_aaccf1b4-f8fd-4b3a-a45c-4ce1ef2c5c73" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_c6b7773f-32b9-407c-be46-5bcab00e2d73" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_aaccf1b4-f8fd-4b3a-a45c-4ce1ef2c5c73" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_c6b7773f-32b9-407c-be46-5bcab00e2d73" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_6f02a330-3acc-4a51-bc3f-abc9441271b5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProfitLoss"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_aaccf1b4-f8fd-4b3a-a45c-4ce1ef2c5c73" xlink:to="loc_us-gaap_ProfitLoss_6f02a330-3acc-4a51-bc3f-abc9441271b5" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/CONSOLIDATEDSTATEMENTSOFEQUITY" xlink:type="simple" xlink:href="ldos-20210101.xsd#CONSOLIDATEDSTATEMENTSOFEQUITY"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/CONSOLIDATEDSTATEMENTSOFEQUITY" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/CONSOLIDATEDSTATEMENTSOFEQUITYParenthetical" xlink:type="simple" xlink:href="ldos-20210101.xsd#CONSOLIDATEDSTATEMENTSOFEQUITYParenthetical"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/CONSOLIDATEDSTATEMENTSOFEQUITYParenthetical" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS" xlink:type="simple" xlink:href="ldos-20210101.xsd#CONSOLIDATEDSTATEMENTSOFCASHFLOWS"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_2f44cf98-dff4-45c4-9792-ad8efc216c92" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested_d2c85ff8-c06e-4ebe-9243-b8193a987ce4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_2f44cf98-dff4-45c4-9792-ad8efc216c92" xlink:to="loc_us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested_d2c85ff8-c06e-4ebe-9243-b8193a987ce4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_115c6d3c-ecf1-464e-9ab8-494c69d7cdad" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_2f44cf98-dff4-45c4-9792-ad8efc216c92" xlink:to="loc_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_115c6d3c-ecf1-464e-9ab8-494c69d7cdad" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromCollectionOfNotesReceivable_31f93880-ffcc-42b0-bbb9-8b9c3214d592" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromCollectionOfNotesReceivable"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_2f44cf98-dff4-45c4-9792-ad8efc216c92" xlink:to="loc_us-gaap_ProceedsFromCollectionOfNotesReceivable_31f93880-ffcc-42b0-bbb9-8b9c3214d592" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_d0f7f90c-c0e8-4cc2-884d-d3b203702fc5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_2f44cf98-dff4-45c4-9792-ad8efc216c92" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_d0f7f90c-c0e8-4cc2-884d-d3b203702fc5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireProductiveAssets_7c70dd6b-4ef3-42b6-80f6-f23b9b4e1280" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsToAcquireProductiveAssets"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_2f44cf98-dff4-45c4-9792-ad8efc216c92" xlink:to="loc_us-gaap_PaymentsToAcquireProductiveAssets_7c70dd6b-4ef3-42b6-80f6-f23b9b4e1280" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_3aad9d87-b44e-43f0-a141-138ee118afc1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsForProceedsFromOtherInvestingActivities"/>
    <link:calculationArc order="6" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_2f44cf98-dff4-45c4-9792-ad8efc216c92" xlink:to="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_3aad9d87-b44e-43f0-a141-138ee118afc1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_2464e602-847a-4ce1-aa81-cbb00e17eb14" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_95e169ce-ef75-4258-9739-bb9eb284b908" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_2464e602-847a-4ce1-aa81-cbb00e17eb14" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_95e169ce-ef75-4258-9739-bb9eb284b908" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_15904de5-c662-47e2-ace8-a4a81a74acd5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_2464e602-847a-4ce1-aa81-cbb00e17eb14" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_15904de5-c662-47e2-ace8-a4a81a74acd5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_0fb92517-7de7-4375-b76c-e97f9a20c156" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_2464e602-847a-4ce1-aa81-cbb00e17eb14" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_0fb92517-7de7-4375-b76c-e97f9a20c156" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_0353be6c-4466-459b-b7bc-65150568ff57" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_6e49f5e4-a353-42f7-ab26-a8a8fd419bc0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInOtherOperatingAssets"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_0353be6c-4466-459b-b7bc-65150568ff57" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_6e49f5e4-a353-42f7-ab26-a8a8fd419bc0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_45a31478-f09a-418b-b7d4-dcf407597615" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensation"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_0353be6c-4466-459b-b7bc-65150568ff57" xlink:to="loc_us-gaap_ShareBasedCompensation_45a31478-f09a-418b-b7d4-dcf407597615" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_f8821c65-ec16-494c-a1c8-c03879159ba7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DepreciationDepletionAndAmortization"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_0353be6c-4466-459b-b7bc-65150568ff57" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_f8821c65-ec16-494c-a1c8-c03879159ba7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetImpairmentCharges_063de30a-c6fa-4d2d-8b03-f1c40cfdb344" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AssetImpairmentCharges"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_0353be6c-4466-459b-b7bc-65150568ff57" xlink:to="loc_us-gaap_AssetImpairmentCharges_063de30a-c6fa-4d2d-8b03-f1c40cfdb344" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_IncreaseDecreaseInAccountsPayableAndAccruedLiabilitiesAndOtherNoncurrentLiabilities_0e1d72a4-3e8d-4cb7-8fd2-2a8fd0cf9ed4" xlink:href="ldos-20210101.xsd#ldos_IncreaseDecreaseInAccountsPayableAndAccruedLiabilitiesAndOtherNoncurrentLiabilities"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_0353be6c-4466-459b-b7bc-65150568ff57" xlink:to="loc_ldos_IncreaseDecreaseInAccountsPayableAndAccruedLiabilitiesAndOtherNoncurrentLiabilities_0e1d72a4-3e8d-4cb7-8fd2-2a8fd0cf9ed4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfBusiness_93044afd-69da-48ce-bcd6-a755139c7242" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GainLossOnSaleOfBusiness"/>
    <link:calculationArc order="6" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_0353be6c-4466-459b-b7bc-65150568ff57" xlink:to="loc_us-gaap_GainLossOnSaleOfBusiness_93044afd-69da-48ce-bcd6-a755139c7242" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities_16d2b434-7111-41e8-9ee9-e31d36f22305" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_0353be6c-4466-459b-b7bc-65150568ff57" xlink:to="loc_us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities_16d2b434-7111-41e8-9ee9-e31d36f22305" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInIncomeTaxes_f47432bc-59d5-44d8-9034-80d1fecf751a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInIncomeTaxes"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_0353be6c-4466-459b-b7bc-65150568ff57" xlink:to="loc_us-gaap_IncreaseDecreaseInIncomeTaxes_f47432bc-59d5-44d8-9034-80d1fecf751a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInReceivables_917f3ffa-761a-4ecb-8ca4-f32ecd5d7ec9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInReceivables"/>
    <link:calculationArc order="9" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_0353be6c-4466-459b-b7bc-65150568ff57" xlink:to="loc_us-gaap_IncreaseDecreaseInReceivables_917f3ffa-761a-4ecb-8ca4-f32ecd5d7ec9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_930acf4c-eef8-4bde-b0f6-e5eac34a7c1b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProfitLoss"/>
    <link:calculationArc order="10" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_0353be6c-4466-459b-b7bc-65150568ff57" xlink:to="loc_us-gaap_ProfitLoss_930acf4c-eef8-4bde-b0f6-e5eac34a7c1b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_5d7c9515-6249-4fd5-bcf2-94de33b3758f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit"/>
    <link:calculationArc order="11" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_0353be6c-4466-459b-b7bc-65150568ff57" xlink:to="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_5d7c9515-6249-4fd5-bcf2-94de33b3758f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_a8387c0f-5727-46cf-a030-2f4cdb749a4d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt"/>
    <link:calculationArc order="12" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_0353be6c-4466-459b-b7bc-65150568ff57" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_a8387c0f-5727-46cf-a030-2f4cdb749a4d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProvisionForDoubtfulAccounts_5baeba74-66a7-4e9b-89bb-679fee60e489" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProvisionForDoubtfulAccounts"/>
    <link:calculationArc order="13" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_0353be6c-4466-459b-b7bc-65150568ff57" xlink:to="loc_us-gaap_ProvisionForDoubtfulAccounts_5baeba74-66a7-4e9b-89bb-679fee60e489" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncashIncomeExpense_ff5bcd46-912e-4804-8b6d-d5b2c8e98a37" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherNoncashIncomeExpense"/>
    <link:calculationArc order="14" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_0353be6c-4466-459b-b7bc-65150568ff57" xlink:to="loc_us-gaap_OtherNoncashIncomeExpense_ff5bcd46-912e-4804-8b6d-d5b2c8e98a37" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_9a9f3fe0-0e37-4d90-95e1-f77297560f7b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfOrdinaryDividends_dd4ddf3b-bcd7-414c-b659-a4903512d0ed" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsOfOrdinaryDividends"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_9a9f3fe0-0e37-4d90-95e1-f77297560f7b" xlink:to="loc_us-gaap_PaymentsOfOrdinaryDividends_dd4ddf3b-bcd7-414c-b659-a4903512d0ed" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfEquity_8d4eae09-d046-49d5-832e-c4766eab2a87" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsForRepurchaseOfEquity"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_9a9f3fe0-0e37-4d90-95e1-f77297560f7b" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfEquity_8d4eae09-d046-49d5-832e-c4766eab2a87" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_PaymentOfTaxIndemnificationLiability_108ad597-258a-4f44-8ece-a7227d68e265" xlink:href="ldos-20210101.xsd#ldos_PaymentOfTaxIndemnificationLiability"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_9a9f3fe0-0e37-4d90-95e1-f77297560f7b" xlink:to="loc_ldos_PaymentOfTaxIndemnificationLiability_108ad597-258a-4f44-8ece-a7227d68e265" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfLongTermDebt_b30d679e-a260-4169-b6eb-eea8e67e5025" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RepaymentsOfLongTermDebt"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_9a9f3fe0-0e37-4d90-95e1-f77297560f7b" xlink:to="loc_us-gaap_RepaymentsOfLongTermDebt_b30d679e-a260-4169-b6eb-eea8e67e5025" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleLeasebackTransactionGrossProceedsFinancingActivities_74c0ee01-9276-4afa-86f2-dcf3177bc41f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SaleLeasebackTransactionGrossProceedsFinancingActivities"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_9a9f3fe0-0e37-4d90-95e1-f77297560f7b" xlink:to="loc_us-gaap_SaleLeasebackTransactionGrossProceedsFinancingActivities_74c0ee01-9276-4afa-86f2-dcf3177bc41f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDebtIssuanceCosts_0eeeffc0-07e4-4daa-90d6-2a309e0a149a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsOfDebtIssuanceCosts"/>
    <link:calculationArc order="6" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_9a9f3fe0-0e37-4d90-95e1-f77297560f7b" xlink:to="loc_us-gaap_PaymentsOfDebtIssuanceCosts_0eeeffc0-07e4-4daa-90d6-2a309e0a149a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOrSaleOfEquity_5ba646c2-b2cf-46bf-b051-2b7cfc772851" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromIssuanceOrSaleOfEquity"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_9a9f3fe0-0e37-4d90-95e1-f77297560f7b" xlink:to="loc_us-gaap_ProceedsFromIssuanceOrSaleOfEquity_5ba646c2-b2cf-46bf-b051-2b7cfc772851" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_b230e380-114d-4603-acd3-9317612bd990" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromPaymentsForOtherFinancingActivities"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_9a9f3fe0-0e37-4d90-95e1-f77297560f7b" xlink:to="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_b230e380-114d-4603-acd3-9317612bd990" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfDebt_a9897b41-649c-4c20-bb0d-f038368b3c06" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromIssuanceOfDebt"/>
    <link:calculationArc order="9" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_9a9f3fe0-0e37-4d90-95e1-f77297560f7b" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfDebt_a9897b41-649c-4c20-bb0d-f038368b3c06" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/NatureofOperationsandBasisofPresentation" xlink:type="simple" xlink:href="ldos-20210101.xsd#NatureofOperationsandBasisofPresentation"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/NatureofOperationsandBasisofPresentation" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/NatureofOperationsandBasisofPresentationDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#NatureofOperationsandBasisofPresentationDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/NatureofOperationsandBasisofPresentationDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/AccountingStandards" xlink:type="simple" xlink:href="ldos-20210101.xsd#AccountingStandards"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/AccountingStandards" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/SummaryofSignificantAccountingPolicies" xlink:type="simple" xlink:href="ldos-20210101.xsd#SummaryofSignificantAccountingPolicies"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/SummaryofSignificantAccountingPolicies" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/SummaryofSignificantAccountingPoliciesPolicies" xlink:type="simple" xlink:href="ldos-20210101.xsd#SummaryofSignificantAccountingPoliciesPolicies"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/SummaryofSignificantAccountingPoliciesPolicies" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/SummaryofSignificantAccountingPoliciesTables" xlink:type="simple" xlink:href="ldos-20210101.xsd#SummaryofSignificantAccountingPoliciesTables"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/SummaryofSignificantAccountingPoliciesTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/SummaryofSignificantAccountingPoliciesChangesinEstimatesonContractsDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#SummaryofSignificantAccountingPoliciesChangesinEstimatesonContractsDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/SummaryofSignificantAccountingPoliciesChangesinEstimatesonContractsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ldos_IncreaseDecreaseInIncomeFromChangeInContractEstimates_b4e55fdc-ae43-4d7d-97ab-665726742cc2" xlink:href="ldos-20210101.xsd#ldos_IncreaseDecreaseInIncomeFromChangeInContractEstimates"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_IncreaseInIncomeBeforeIncomeTaxesFromChangesInContractEstimates_3c7a69e3-50cd-482d-9203-efa1e8797977" xlink:href="ldos-20210101.xsd#ldos_IncreaseInIncomeBeforeIncomeTaxesFromChangesInContractEstimates"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ldos_IncreaseDecreaseInIncomeFromChangeInContractEstimates_b4e55fdc-ae43-4d7d-97ab-665726742cc2" xlink:to="loc_ldos_IncreaseInIncomeBeforeIncomeTaxesFromChangesInContractEstimates_3c7a69e3-50cd-482d-9203-efa1e8797977" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_DecreaseInIncomeBeforeIncomeTaxesFromChangesInContractEstimates_fcd55e8d-2781-4eb8-9556-688dc59dba60" xlink:href="ldos-20210101.xsd#ldos_DecreaseInIncomeBeforeIncomeTaxesFromChangesInContractEstimates"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ldos_IncreaseDecreaseInIncomeFromChangeInContractEstimates_b4e55fdc-ae43-4d7d-97ab-665726742cc2" xlink:to="loc_ldos_DecreaseInIncomeBeforeIncomeTaxesFromChangesInContractEstimates_fcd55e8d-2781-4eb8-9556-688dc59dba60" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/SummaryofSignificantAccountingPoliciesAdditionalInformationDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#SummaryofSignificantAccountingPoliciesAdditionalInformationDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/SummaryofSignificantAccountingPoliciesAdditionalInformationDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/SummaryofSignificantAccountingPoliciesIntangiblesDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#SummaryofSignificantAccountingPoliciesIntangiblesDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/SummaryofSignificantAccountingPoliciesIntangiblesDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/SummaryofSignificantAccountingPoliciesScheduleofDepreciationusingEstimatedUsefulLivesDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#SummaryofSignificantAccountingPoliciesScheduleofDepreciationusingEstimatedUsefulLivesDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/SummaryofSignificantAccountingPoliciesScheduleofDepreciationusingEstimatedUsefulLivesDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/Revenues" xlink:type="simple" xlink:href="ldos-20210101.xsd#Revenues"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/Revenues" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/RevenuesTables" xlink:type="simple" xlink:href="ldos-20210101.xsd#RevenuesTables"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/RevenuesTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/RevenuesNarrativeDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#RevenuesNarrativeDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/RevenuesNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/RevenuesNarrativeDetails_1" xlink:type="simple" xlink:href="ldos-20210101.xsd#RevenuesNarrativeDetails_1"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/RevenuesNarrativeDetails_1" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/RevenuesDisaggregationofrevenueDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#RevenuesDisaggregationofrevenueDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/RevenuesDisaggregationofrevenueDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/ContractAssetandLiabilities" xlink:type="simple" xlink:href="ldos-20210101.xsd#ContractAssetandLiabilities"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/ContractAssetandLiabilities" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/ContractAssetandLiabilitiesTables" xlink:type="simple" xlink:href="ldos-20210101.xsd#ContractAssetandLiabilitiesTables"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/ContractAssetandLiabilitiesTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/ContractAssetandLiabilitiesDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#ContractAssetandLiabilitiesDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/ContractAssetandLiabilitiesDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/ContractAssetandLiabilitiesAdditionalInformationDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#ContractAssetandLiabilitiesAdditionalInformationDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/ContractAssetandLiabilitiesAdditionalInformationDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/Acquisitions" xlink:type="simple" xlink:href="ldos-20210101.xsd#Acquisitions"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/Acquisitions" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/AcquisitionsTables" xlink:type="simple" xlink:href="ldos-20210101.xsd#AcquisitionsTables"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/AcquisitionsTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/AcquisitionsNarrativeDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#AcquisitionsNarrativeDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/AcquisitionsNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/AcquisitionsScheduleofpreliminaryfairvaluesoftheassetsacquiredandliabilitiesassumedDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#AcquisitionsScheduleofpreliminaryfairvaluesoftheassetsacquiredandliabilitiesassumedDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/AcquisitionsScheduleofpreliminaryfairvaluesoftheassetsacquiredandliabilitiesassumedDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_55216298-4c82-4441-92cf-26f61d5a5e1f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_fb05111c-0db7-49ea-8f21-9653ff61e0aa" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_55216298-4c82-4441-92cf-26f61d5a5e1f" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_fb05111c-0db7-49ea-8f21-9653ff61e0aa" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_0c000a94-7e4f-4b39-a237-23659432217d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_55216298-4c82-4441-92cf-26f61d5a5e1f" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_0c000a94-7e4f-4b39-a237-23659432217d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther_71eeacc2-38eb-43a2-9083-ed329bc8dfb7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_55216298-4c82-4441-92cf-26f61d5a5e1f" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther_71eeacc2-38eb-43a2-9083-ed329bc8dfb7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory_6e66a5f9-3ef7-4ab1-85ab-5438d49c1db8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_55216298-4c82-4441-92cf-26f61d5a5e1f" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory_6e66a5f9-3ef7-4ab1-85ab-5438d49c1db8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_fbf9873c-3e1a-44bc-bce3-3df12fdc7792" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_55216298-4c82-4441-92cf-26f61d5a5e1f" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_fbf9873c-3e1a-44bc-bce3-3df12fdc7792" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities_1ab6cc53-ed96-4405-8c9b-5ea1ce1a7e1c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities"/>
    <link:calculationArc order="6" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_55216298-4c82-4441-92cf-26f61d5a5e1f" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities_1ab6cc53-ed96-4405-8c9b-5ea1ce1a7e1c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_18f6c8ad-8098-4036-a150-1ace4663681a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_55216298-4c82-4441-92cf-26f61d5a5e1f" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_18f6c8ad-8098-4036-a150-1ace4663681a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingLeaseRightOfUseAssets_e87eca9e-0e66-40ef-a7b1-d88b225f55fa" xlink:href="ldos-20210101.xsd#ldos_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingLeaseRightOfUseAssets"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_55216298-4c82-4441-92cf-26f61d5a5e1f" xlink:to="loc_ldos_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingLeaseRightOfUseAssets_e87eca9e-0e66-40ef-a7b1-d88b225f55fa" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingLeaseLiabilities_9e16a985-a76b-4157-a5f1-d6572c962f54" xlink:href="ldos-20210101.xsd#ldos_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingLeaseLiabilities"/>
    <link:calculationArc order="9" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_55216298-4c82-4441-92cf-26f61d5a5e1f" xlink:to="loc_ldos_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingLeaseLiabilities_9e16a985-a76b-4157-a5f1-d6572c962f54" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedPayrollAndEmployeeBenefits_559e188c-d817-406e-abda-e089eedeadcb" xlink:href="ldos-20210101.xsd#ldos_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedPayrollAndEmployeeBenefits"/>
    <link:calculationArc order="10" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_55216298-4c82-4441-92cf-26f61d5a5e1f" xlink:to="loc_ldos_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedPayrollAndEmployeeBenefits_559e188c-d817-406e-abda-e089eedeadcb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayableAndAccruedLiabilities_194fc0db-569f-4a5f-bbe4-ae6bf0649a0c" xlink:href="ldos-20210101.xsd#ldos_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayableAndAccruedLiabilities"/>
    <link:calculationArc order="11" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_55216298-4c82-4441-92cf-26f61d5a5e1f" xlink:to="loc_ldos_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayableAndAccruedLiabilities_194fc0db-569f-4a5f-bbe4-ae6bf0649a0c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_7b59acc1-db07-4b52-8e64-c5da4900a3c5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables"/>
    <link:calculationArc order="12" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_55216298-4c82-4441-92cf-26f61d5a5e1f" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_7b59acc1-db07-4b52-8e64-c5da4900a3c5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_cd25d00d-f7c9-4022-ba37-c6e8e9c0f34d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents"/>
    <link:calculationArc order="13" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_55216298-4c82-4441-92cf-26f61d5a5e1f" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_cd25d00d-f7c9-4022-ba37-c6e8e9c0f34d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_665c2cb5-e65c-4d6e-9f48-115b2214f81e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_e17879f4-3beb-47fc-b2d7-24dd8dede24f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_665c2cb5-e65c-4d6e-9f48-115b2214f81e" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_e17879f4-3beb-47fc-b2d7-24dd8dede24f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_ee9b132c-695e-48ef-86d0-5ff42c248d0d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Goodwill"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_665c2cb5-e65c-4d6e-9f48-115b2214f81e" xlink:to="loc_us-gaap_Goodwill_ee9b132c-695e-48ef-86d0-5ff42c248d0d" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/AcquisitionsScheduleofintangibleassetsacquiredDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#AcquisitionsScheduleofintangibleassetsacquiredDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/AcquisitionsScheduleofintangibleassetsacquiredDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_1288d960-9a9c-4c48-9565-c5913e9e49b8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets_3ca6ba5e-a480-4fa9-a5f0-a20db725da16" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_1288d960-9a9c-4c48-9565-c5913e9e49b8" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets_3ca6ba5e-a480-4fa9-a5f0-a20db725da16" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_26620bde-b666-47f9-b35f-672b3a887a08" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_1288d960-9a9c-4c48-9565-c5913e9e49b8" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_26620bde-b666-47f9-b35f-672b3a887a08" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/AcquisitionsAcquisitionexpensesincurredDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#AcquisitionsAcquisitionexpensesincurredDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/AcquisitionsAcquisitionexpensesincurredDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ldos_BusinessCombinationAcquisitionAndIntegrationRelatedCosts_b831ce0c-9094-418a-93db-acb08c08f732" xlink:href="ldos-20210101.xsd#ldos_BusinessCombinationAcquisitionAndIntegrationRelatedCosts"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationIntegrationRelatedCosts_37e27d81-5ee2-4efd-b7ce-b6c64c30120c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationIntegrationRelatedCosts"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ldos_BusinessCombinationAcquisitionAndIntegrationRelatedCosts_b831ce0c-9094-418a-93db-acb08c08f732" xlink:to="loc_us-gaap_BusinessCombinationIntegrationRelatedCosts_37e27d81-5ee2-4efd-b7ce-b6c64c30120c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_941d2fe2-633b-43b5-9de1-7f72c57e4913" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationAcquisitionRelatedCosts"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ldos_BusinessCombinationAcquisitionAndIntegrationRelatedCosts_b831ce0c-9094-418a-93db-acb08c08f732" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_941d2fe2-633b-43b5-9de1-7f72c57e4913" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/AcquisitionsProFormaInformationDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#AcquisitionsProFormaInformationDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/AcquisitionsProFormaInformationDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/Divestitures" xlink:type="simple" xlink:href="ldos-20210101.xsd#Divestitures"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/Divestitures" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/DivestituresDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#DivestituresDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/DivestituresDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/Receivables" xlink:type="simple" xlink:href="ldos-20210101.xsd#Receivables"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/Receivables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/ReceivablesTables" xlink:type="simple" xlink:href="ldos-20210101.xsd#ReceivablesTables"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/ReceivablesTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/ReceivablesDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#ReceivablesDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/ReceivablesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_9181c286-bc1f-45a4-b2f0-77e3fb40e142" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountsReceivableNetCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BilledContractReceivables_8e8575a6-fa56-45b7-812a-6b0c7fac9319" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BilledContractReceivables"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccountsReceivableNetCurrent_9181c286-bc1f-45a4-b2f0-77e3fb40e142" xlink:to="loc_us-gaap_BilledContractReceivables_8e8575a6-fa56-45b7-812a-6b0c7fac9319" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_f860503f-44ab-42b7-b37c-878b68e415d2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccountsReceivableNetCurrent_9181c286-bc1f-45a4-b2f0-77e3fb40e142" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_f860503f-44ab-42b7-b37c-878b68e415d2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnbilledContractsReceivable_4a52466f-c315-40c6-87cb-ef31fa64d349" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_UnbilledContractsReceivable"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccountsReceivableNetCurrent_9181c286-bc1f-45a4-b2f0-77e3fb40e142" xlink:to="loc_us-gaap_UnbilledContractsReceivable_4a52466f-c315-40c6-87cb-ef31fa64d349" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/Inventory" xlink:type="simple" xlink:href="ldos-20210101.xsd#Inventory"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/Inventory" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/InventoryTables" xlink:type="simple" xlink:href="ldos-20210101.xsd#InventoryTables"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/InventoryTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/InventoryDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#InventoryDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/InventoryDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryNet_70992d60-23ae-456c-a8b0-f76cf9a483eb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InventoryNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryWorkInProcessNetOfReserves_3dda5b97-24cb-46fa-8a8a-0ce60dc7369a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InventoryWorkInProcessNetOfReserves"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InventoryNet_70992d60-23ae-456c-a8b0-f76cf9a483eb" xlink:to="loc_us-gaap_InventoryWorkInProcessNetOfReserves_3dda5b97-24cb-46fa-8a8a-0ce60dc7369a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryRawMaterialsNetOfReserves_562d87ad-2192-43a0-85ff-4eb9b7749cd1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InventoryRawMaterialsNetOfReserves"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InventoryNet_70992d60-23ae-456c-a8b0-f76cf9a483eb" xlink:to="loc_us-gaap_InventoryRawMaterialsNetOfReserves_562d87ad-2192-43a0-85ff-4eb9b7749cd1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryFinishedGoodsNetOfReserves_bbf2f702-53b5-43bf-b1da-240a52e1717d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InventoryFinishedGoodsNetOfReserves"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InventoryNet_70992d60-23ae-456c-a8b0-f76cf9a483eb" xlink:to="loc_us-gaap_InventoryFinishedGoodsNetOfReserves_bbf2f702-53b5-43bf-b1da-240a52e1717d" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/GoodwillandIntangibleAssets" xlink:type="simple" xlink:href="ldos-20210101.xsd#GoodwillandIntangibleAssets"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/GoodwillandIntangibleAssets" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/GoodwillandIntangibleAssetsTables" xlink:type="simple" xlink:href="ldos-20210101.xsd#GoodwillandIntangibleAssetsTables"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/GoodwillandIntangibleAssetsTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/GoodwillandIntangibleAssetsScheduleofChangesinGoodwillbySegmentDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#GoodwillandIntangibleAssetsScheduleofChangesinGoodwillbySegmentDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/GoodwillandIntangibleAssetsScheduleofChangesinGoodwillbySegmentDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/GoodwillandIntangibleAssetsNarrativeDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#GoodwillandIntangibleAssetsNarrativeDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/GoodwillandIntangibleAssetsNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/GoodwillandIntangibleAssetsScheduleofintangibleassetsDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#GoodwillandIntangibleAssetsScheduleofintangibleassetsDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/GoodwillandIntangibleAssetsScheduleofintangibleassetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_0ea94364-b6f8-4bf5-a6b8-a762141964b1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_91459e40-ca08-4345-98f5-20cab093086f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_0ea94364-b6f8-4bf5-a6b8-a762141964b1" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_91459e40-ca08-4345-98f5-20cab093086f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_8fb6c7f7-18ec-4326-b8e5-11c9939dd8cb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_0ea94364-b6f8-4bf5-a6b8-a762141964b1" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_8fb6c7f7-18ec-4326-b8e5-11c9939dd8cb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_5965ac1e-cf71-4d9c-8442-4866bf0102bd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_5447c6e9-95e0-4265-a51f-51a12a20c7e3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IntangibleAssetsGrossExcludingGoodwill"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_5965ac1e-cf71-4d9c-8442-4866bf0102bd" xlink:to="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_5447c6e9-95e0-4265-a51f-51a12a20c7e3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_58fe6cf0-ac9a-4f2b-ae17-27b7ddda94dd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_5965ac1e-cf71-4d9c-8442-4866bf0102bd" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_58fe6cf0-ac9a-4f2b-ae17-27b7ddda94dd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_dd912b85-4d2f-4dea-aa98-2e9cc3cdf6dd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IntangibleAssetsGrossExcludingGoodwill"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_3d191fd3-f1fe-440b-b559-16b2f16d9861" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_dd912b85-4d2f-4dea-aa98-2e9cc3cdf6dd" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_3d191fd3-f1fe-440b-b559-16b2f16d9861" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_92a7e88a-bf91-4459-b8e3-1b4daad96b18" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_dd912b85-4d2f-4dea-aa98-2e9cc3cdf6dd" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_92a7e88a-bf91-4459-b8e3-1b4daad96b18" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/GoodwillandIntangibleAssetsScheduleofintangibleassetsDetails_1" xlink:type="simple" xlink:href="ldos-20210101.xsd#GoodwillandIntangibleAssetsScheduleofintangibleassetsDetails_1"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/GoodwillandIntangibleAssetsScheduleofintangibleassetsDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_6346cf43-b5ef-4d62-844e-f94c0a2c177c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_aba717c4-eb94-4add-8e4f-34675d5d5c2d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_6346cf43-b5ef-4d62-844e-f94c0a2c177c" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_aba717c4-eb94-4add-8e4f-34675d5d5c2d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_1c942f6c-6f04-485e-bcf5-ed5cb2d3ff89" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_6346cf43-b5ef-4d62-844e-f94c0a2c177c" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_1c942f6c-6f04-485e-bcf5-ed5cb2d3ff89" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/GoodwillandIntangibleAssetsScheduleofestimatedannualamortizationexpenseDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#GoodwillandIntangibleAssetsScheduleofestimatedannualamortizationexpenseDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/GoodwillandIntangibleAssetsScheduleofestimatedannualamortizationexpenseDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_1906e182-69b7-4923-a023-beb87f34e3d2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_a5a71f43-40e9-4a20-8aca-066833641976" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_1906e182-69b7-4923-a023-beb87f34e3d2" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_a5a71f43-40e9-4a20-8aca-066833641976" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive_f8a5f169-dd38-414b-9774-ce1500e6e803" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_1906e182-69b7-4923-a023-beb87f34e3d2" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive_f8a5f169-dd38-414b-9774-ce1500e6e803" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_56ca2937-20d2-4534-a297-a3fb20ddfacb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_1906e182-69b7-4923-a023-beb87f34e3d2" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_56ca2937-20d2-4534-a297-a3fb20ddfacb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_1bb09851-60ae-4832-bb21-15f1db22f012" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_1906e182-69b7-4923-a023-beb87f34e3d2" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_1bb09851-60ae-4832-bb21-15f1db22f012" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_123b6152-479d-4991-b615-bb9d8e3ccd2e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_1906e182-69b7-4923-a023-beb87f34e3d2" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_123b6152-479d-4991-b615-bb9d8e3ccd2e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_1585d7a9-0b3c-4b9f-8ea3-7707d192e4fb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_1906e182-69b7-4923-a023-beb87f34e3d2" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_1585d7a9-0b3c-4b9f-8ea3-7707d192e4fb" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/PropertyPlantandEquipment" xlink:type="simple" xlink:href="ldos-20210101.xsd#PropertyPlantandEquipment"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/PropertyPlantandEquipment" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/PropertyPlantandEquipmentTables" xlink:type="simple" xlink:href="ldos-20210101.xsd#PropertyPlantandEquipmentTables"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/PropertyPlantandEquipmentTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/PropertyPlantandEquipmentScheduleofPropertyPlantandEquipmentDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#PropertyPlantandEquipmentScheduleofPropertyPlantandEquipmentDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/PropertyPlantandEquipmentScheduleofPropertyPlantandEquipmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_5688e283-9ab9-4638-8640-eca141e95eab" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization_3d633b5a-c134-41c1-8d28-97340f50f7a4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_5688e283-9ab9-4638-8640-eca141e95eab" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization_3d633b5a-c134-41c1-8d28-97340f50f7a4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization_1038b79a-1e9f-49b6-8063-8da4bdec400a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_5688e283-9ab9-4638-8640-eca141e95eab" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization_1038b79a-1e9f-49b6-8063-8da4bdec400a" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/PropertyPlantandEquipmentNarrativeDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#PropertyPlantandEquipmentNarrativeDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/PropertyPlantandEquipmentNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/Leases" xlink:type="simple" xlink:href="ldos-20210101.xsd#Leases"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/Leases" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/LeasesTables" xlink:type="simple" xlink:href="ldos-20210101.xsd#LeasesTables"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/LeasesTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/LeasesLeasesScheduleofROUassetsandleaseliabilitiesDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#LeasesLeasesScheduleofROUassetsandleaseliabilitiesDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/LeasesLeasesScheduleofROUassetsandleaseliabilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ldos_LeaseLiabilityNoncurrent_4fef87b9-3b11-4a41-a986-82de96832add" xlink:href="ldos-20210101.xsd#ldos_LeaseLiabilityNoncurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityNoncurrent_d5dddd84-a0b9-486c-8921-7a8ee2f02963" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiabilityNoncurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ldos_LeaseLiabilityNoncurrent_4fef87b9-3b11-4a41-a986-82de96832add" xlink:to="loc_us-gaap_FinanceLeaseLiabilityNoncurrent_d5dddd84-a0b9-486c-8921-7a8ee2f02963" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_eff1f6b9-9f02-406f-a3ea-fd2608851b38" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ldos_LeaseLiabilityNoncurrent_4fef87b9-3b11-4a41-a986-82de96832add" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_eff1f6b9-9f02-406f-a3ea-fd2608851b38" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_LeaseLiabilityCurrent_7a1ef66a-2fed-4262-9eff-7e5c7b52a3e1" xlink:href="ldos-20210101.xsd#ldos_LeaseLiabilityCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityCurrent_35335fba-6900-4de8-a56f-1f26b5696e93" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiabilityCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ldos_LeaseLiabilityCurrent_7a1ef66a-2fed-4262-9eff-7e5c7b52a3e1" xlink:to="loc_us-gaap_FinanceLeaseLiabilityCurrent_35335fba-6900-4de8-a56f-1f26b5696e93" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_67792655-8caa-44bf-a979-6480be9d459f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseLiabilityCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ldos_LeaseLiabilityCurrent_7a1ef66a-2fed-4262-9eff-7e5c7b52a3e1" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrent_67792655-8caa-44bf-a979-6480be9d459f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_LeaseRightOfUseAsset_51c5bd0e-11cb-4e40-b4a7-39ecc2f473a5" xlink:href="ldos-20210101.xsd#ldos_LeaseRightOfUseAsset"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAsset_8e1df458-6eb1-4abc-8a15-675fd07b1dd1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseRightOfUseAsset"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ldos_LeaseRightOfUseAsset_51c5bd0e-11cb-4e40-b4a7-39ecc2f473a5" xlink:to="loc_us-gaap_FinanceLeaseRightOfUseAsset_8e1df458-6eb1-4abc-8a15-675fd07b1dd1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_1095a941-180e-4a33-af4d-1909295ca5fc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ldos_LeaseRightOfUseAsset_51c5bd0e-11cb-4e40-b4a7-39ecc2f473a5" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_1095a941-180e-4a33-af4d-1909295ca5fc" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/LeasesNarrativeDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#LeasesNarrativeDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/LeasesNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/LeasesLeasesScheduleofleasecostDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#LeasesLeasesScheduleofleasecostDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/LeasesLeasesScheduleofleasecostDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ldos_FinanceLeaseCost_d0b86952-2466-4fb5-9bd7-186fe33b42a7" xlink:href="ldos-20210101.xsd#ldos_FinanceLeaseCost"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAssetAmortization_4682bc25-ab4f-485a-a002-090ce5204789" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseRightOfUseAssetAmortization"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ldos_FinanceLeaseCost_d0b86952-2466-4fb5-9bd7-186fe33b42a7" xlink:to="loc_us-gaap_FinanceLeaseRightOfUseAssetAmortization_4682bc25-ab4f-485a-a002-090ce5204789" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseInterestExpense_29621fdc-7126-4c70-87ec-14f1913d2712" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseInterestExpense"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ldos_FinanceLeaseCost_d0b86952-2466-4fb5-9bd7-186fe33b42a7" xlink:to="loc_us-gaap_FinanceLeaseInterestExpense_29621fdc-7126-4c70-87ec-14f1913d2712" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseCost_08e109f3-7fb9-4c92-b9b7-9d2c54633d5d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LeaseCost"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_FinanceLeaseCost_3e1255fb-c9a6-4dd9-a44c-b380de2f2bef" xlink:href="ldos-20210101.xsd#ldos_FinanceLeaseCost"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LeaseCost_08e109f3-7fb9-4c92-b9b7-9d2c54633d5d" xlink:to="loc_ldos_FinanceLeaseCost_3e1255fb-c9a6-4dd9-a44c-b380de2f2bef" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseCost_3af84167-cdbb-4ed7-a792-46e7d627d897" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseCost"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LeaseCost_08e109f3-7fb9-4c92-b9b7-9d2c54633d5d" xlink:to="loc_us-gaap_OperatingLeaseCost_3af84167-cdbb-4ed7-a792-46e7d627d897" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableLeaseCost_b6b3cca0-30b8-4700-b97a-d8874d2785f6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_VariableLeaseCost"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LeaseCost_08e109f3-7fb9-4c92-b9b7-9d2c54633d5d" xlink:to="loc_us-gaap_VariableLeaseCost_b6b3cca0-30b8-4700-b97a-d8874d2785f6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermLeaseCost_d35fbc22-f147-404c-ae17-b1db8346bf69" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShortTermLeaseCost"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LeaseCost_08e109f3-7fb9-4c92-b9b7-9d2c54633d5d" xlink:to="loc_us-gaap_ShortTermLeaseCost_d35fbc22-f147-404c-ae17-b1db8346bf69" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubleaseIncome_25404087-1935-47fa-8657-8b6237d2790c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SubleaseIncome"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LeaseCost_08e109f3-7fb9-4c92-b9b7-9d2c54633d5d" xlink:to="loc_us-gaap_SubleaseIncome_25404087-1935-47fa-8657-8b6237d2790c" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/LeasesLeasesScheduleofotherinformationrelatedtoleasesDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#LeasesLeasesScheduleofotherinformationrelatedtoleasesDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/LeasesLeasesScheduleofotherinformationrelatedtoleasesDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/LeasesLeasesScheduleoffutureminimumleasecommitmentsDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#LeasesLeasesScheduleoffutureminimumleasecommitmentsDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/LeasesLeasesScheduleoffutureminimumleasecommitmentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_261c5a6f-88dd-479a-983c-c23430829745" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_badae852-beaa-4fdb-82a4-a53067b76e00" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_261c5a6f-88dd-479a-983c-c23430829745" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_badae852-beaa-4fdb-82a4-a53067b76e00" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_49d1824d-0b2a-41c3-aad6-ff5bc55b80bf" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseLiability"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_261c5a6f-88dd-479a-983c-c23430829745" xlink:to="loc_us-gaap_OperatingLeaseLiability_49d1824d-0b2a-41c3-aad6-ff5bc55b80bf" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_487cc5fd-53d9-4183-8210-98b1c867c7f2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueNextTwelveMonths_0833c2dd-e3ea-47c8-9b65-8dd1cb52b87d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueNextTwelveMonths"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_487cc5fd-53d9-4183-8210-98b1c867c7f2" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueNextTwelveMonths_0833c2dd-e3ea-47c8-9b65-8dd1cb52b87d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo_21a1e585-bbe0-4970-8c91-6fa202b3f1c9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_487cc5fd-53d9-4183-8210-98b1c867c7f2" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo_21a1e585-bbe0-4970-8c91-6fa202b3f1c9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree_30cd692a-6263-4ab6-a0cf-e9493aed1af0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_487cc5fd-53d9-4183-8210-98b1c867c7f2" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree_30cd692a-6263-4ab6-a0cf-e9493aed1af0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour_bdad049a-9145-4dda-be78-876667892c77" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_487cc5fd-53d9-4183-8210-98b1c867c7f2" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour_bdad049a-9145-4dda-be78-876667892c77" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive_b83ee491-f853-453c-ab1b-889cdf022c99" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_487cc5fd-53d9-4183-8210-98b1c867c7f2" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive_b83ee491-f853-453c-ab1b-889cdf022c99" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive_e91ed4a0-1b9c-4060-9c88-6f0fe270248a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_487cc5fd-53d9-4183-8210-98b1c867c7f2" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive_e91ed4a0-1b9c-4060-9c88-6f0fe270248a" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/LeasesLeasesScheduleoffutureminimumleasecommitmentsDetails_1" xlink:type="simple" xlink:href="ldos-20210101.xsd#LeasesLeasesScheduleoffutureminimumleasecommitmentsDetails_1"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/LeasesLeasesScheduleoffutureminimumleasecommitmentsDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_68323bf7-c47f-49d5-9ef4-41d596d29b7a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_cfa34583-f1ec-4d53-9f1a-f331cc3415da" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_68323bf7-c47f-49d5-9ef4-41d596d29b7a" xlink:to="loc_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_cfa34583-f1ec-4d53-9f1a-f331cc3415da" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiability_0b908785-b62c-4aa5-a32f-d27e1591bbdc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiability"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_68323bf7-c47f-49d5-9ef4-41d596d29b7a" xlink:to="loc_us-gaap_FinanceLeaseLiability_0b908785-b62c-4aa5-a32f-d27e1591bbdc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_c8275094-1c68-4da4-b72e-7764a91361cf" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_b3677250-20a4-4f99-9889-4a78e1b37998" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_c8275094-1c68-4da4-b72e-7764a91361cf" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_b3677250-20a4-4f99-9889-4a78e1b37998" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_86fdf700-f64d-483e-89d7-965da4e541d0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_c8275094-1c68-4da4-b72e-7764a91361cf" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_86fdf700-f64d-483e-89d7-965da4e541d0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_dd62953f-9390-4b6a-96cd-06c0519f40e8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_c8275094-1c68-4da4-b72e-7764a91361cf" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_dd62953f-9390-4b6a-96cd-06c0519f40e8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_5342f222-7294-4385-9895-9506bec122b5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_c8275094-1c68-4da4-b72e-7764a91361cf" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_5342f222-7294-4385-9895-9506bec122b5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_36d095a1-3fbc-46c6-9344-05f9da8ca574" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_c8275094-1c68-4da4-b72e-7764a91361cf" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_36d095a1-3fbc-46c6-9344-05f9da8ca574" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_8e083421-eac5-4fc8-8563-60a115e401a6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_c8275094-1c68-4da4-b72e-7764a91361cf" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_8e083421-eac5-4fc8-8563-60a115e401a6" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/LeasesScheduleofRentalExpenseforFacilitiesandEquipmentDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#LeasesScheduleofRentalExpenseforFacilitiesandEquipmentDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/LeasesScheduleofRentalExpenseforFacilitiesandEquipmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseAndRentalExpense_596f5af5-2362-4c32-8ae3-50da61f75c5e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LeaseAndRentalExpense"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeasesRentExpenseMinimumRentals_02eb75a6-8e08-409f-a589-09987b1473eb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeasesRentExpenseMinimumRentals"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LeaseAndRentalExpense_596f5af5-2362-4c32-8ae3-50da61f75c5e" xlink:to="loc_us-gaap_OperatingLeasesRentExpenseMinimumRentals_02eb75a6-8e08-409f-a589-09987b1473eb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeasesIncomeStatementSubleaseRevenue_6ed5ad93-e0ab-4e22-ba9d-906bbacdffb0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeasesIncomeStatementSubleaseRevenue"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LeaseAndRentalExpense_596f5af5-2362-4c32-8ae3-50da61f75c5e" xlink:to="loc_us-gaap_OperatingLeasesIncomeStatementSubleaseRevenue_6ed5ad93-e0ab-4e22-ba9d-906bbacdffb0" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/LeasesLeasesScheduleofcomponentsofleaseincomeDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#LeasesLeasesScheduleofcomponentsofleaseincomeDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/LeasesLeasesScheduleofcomponentsofleaseincomeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesTypeLeaseSellingProfitLoss_f09d12fb-b0d7-4331-ad55-fc73691b9e6b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SalesTypeLeaseSellingProfitLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesTypeLeaseRevenue_f7e4cea0-2d57-4786-888d-a74981dc9d3c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SalesTypeLeaseRevenue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SalesTypeLeaseSellingProfitLoss_f09d12fb-b0d7-4331-ad55-fc73691b9e6b" xlink:to="loc_us-gaap_SalesTypeLeaseRevenue_f7e4cea0-2d57-4786-888d-a74981dc9d3c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsSoldSalesTypeLease_b69c1ce7-09c8-4872-9056-cfaf6d4743a8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CostOfGoodsSoldSalesTypeLease"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SalesTypeLeaseSellingProfitLoss_f09d12fb-b0d7-4331-ad55-fc73691b9e6b" xlink:to="loc_us-gaap_CostOfGoodsSoldSalesTypeLease_b69c1ce7-09c8-4872-9056-cfaf6d4743a8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesTypeLeaseLeaseIncome_fa92d3d2-5f07-470d-8ef6-40ffcec04985" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SalesTypeLeaseLeaseIncome"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesTypeLeaseSellingProfitLoss_1c220369-bb0b-4cc7-979e-be9c464cbf58" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SalesTypeLeaseSellingProfitLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SalesTypeLeaseLeaseIncome_fa92d3d2-5f07-470d-8ef6-40ffcec04985" xlink:to="loc_us-gaap_SalesTypeLeaseSellingProfitLoss_1c220369-bb0b-4cc7-979e-be9c464cbf58" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesTypeLeaseInterestIncomeLeaseReceivable_3ff215a6-cd86-406b-9ea9-2ea9b02e451d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SalesTypeLeaseInterestIncomeLeaseReceivable"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SalesTypeLeaseLeaseIncome_fa92d3d2-5f07-470d-8ef6-40ffcec04985" xlink:to="loc_us-gaap_SalesTypeLeaseInterestIncomeLeaseReceivable_3ff215a6-cd86-406b-9ea9-2ea9b02e451d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseIncome_03fb2f62-591e-49fe-8403-1dd06c679cee" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LeaseIncome"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesTypeLeaseLeaseIncome_3b096ee7-7ea4-4b4a-9365-e1df9db8e0a5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SalesTypeLeaseLeaseIncome"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LeaseIncome_03fb2f62-591e-49fe-8403-1dd06c679cee" xlink:to="loc_us-gaap_SalesTypeLeaseLeaseIncome_3b096ee7-7ea4-4b4a-9365-e1df9db8e0a5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLeaseIncome_ff4250cc-1aac-47cb-a05e-ec8f2e9f0190" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseLeaseIncome"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LeaseIncome_03fb2f62-591e-49fe-8403-1dd06c679cee" xlink:to="loc_us-gaap_OperatingLeaseLeaseIncome_ff4250cc-1aac-47cb-a05e-ec8f2e9f0190" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/LeasesLeasesScheduleofundiscountedcashflowsforsalestypeandoperatingleasesDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#LeasesLeasesScheduleofundiscountedcashflowsforsalestypeandoperatingleasesDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/LeasesLeasesScheduleofundiscountedcashflowsforsalestypeandoperatingleasesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceived_d501084c-faa1-4f52-8262-9009d057326d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceived"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedNextTwelveMonths_34fe654a-5624-4225-b542-4fe7fac98a36" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedNextTwelveMonths"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceived_d501084c-faa1-4f52-8262-9009d057326d" xlink:to="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedNextTwelveMonths_34fe654a-5624-4225-b542-4fe7fac98a36" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedTwoYears_dafa3864-81bb-4e48-a1b1-490cba28a045" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedTwoYears"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceived_d501084c-faa1-4f52-8262-9009d057326d" xlink:to="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedTwoYears_dafa3864-81bb-4e48-a1b1-490cba28a045" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThreeYears_6e686377-c023-41e2-b03c-9067f8779a9c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThreeYears"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceived_d501084c-faa1-4f52-8262-9009d057326d" xlink:to="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThreeYears_6e686377-c023-41e2-b03c-9067f8779a9c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFourYears_5a77afff-69d3-4bd0-84d4-a4c0f73f3a39" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFourYears"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceived_d501084c-faa1-4f52-8262-9009d057326d" xlink:to="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFourYears_5a77afff-69d3-4bd0-84d4-a4c0f73f3a39" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFiveYears_f97c7995-53c8-45cd-8938-031589add370" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFiveYears"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceived_d501084c-faa1-4f52-8262-9009d057326d" xlink:to="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFiveYears_f97c7995-53c8-45cd-8938-031589add370" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceived_6c3dd1c5-a7b5-4d9a-9376-229b8582eea3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LessorOperatingLeasePaymentsToBeReceived"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths_a12ac681-4cd5-4199-b001-eff49d043a8a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceived_6c3dd1c5-a7b5-4d9a-9376-229b8582eea3" xlink:to="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths_a12ac681-4cd5-4199-b001-eff49d043a8a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedTwoYears_0ed3d949-aec3-418c-b81f-1e27367162db" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LessorOperatingLeasePaymentsToBeReceivedTwoYears"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceived_6c3dd1c5-a7b5-4d9a-9376-229b8582eea3" xlink:to="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedTwoYears_0ed3d949-aec3-418c-b81f-1e27367162db" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedThreeYears_48fac669-5014-481d-b976-cf5d0ef38c2b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LessorOperatingLeasePaymentsToBeReceivedThreeYears"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceived_6c3dd1c5-a7b5-4d9a-9376-229b8582eea3" xlink:to="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedThreeYears_48fac669-5014-481d-b976-cf5d0ef38c2b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedFourYears_03b9e099-3b61-42dc-af71-0fd94b3357c9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LessorOperatingLeasePaymentsToBeReceivedFourYears"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceived_6c3dd1c5-a7b5-4d9a-9376-229b8582eea3" xlink:to="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedFourYears_03b9e099-3b61-42dc-af71-0fd94b3357c9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedFiveYears_2c8f68b6-3b46-4d00-bb41-8ba9e4d5a3ff" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LessorOperatingLeasePaymentsToBeReceivedFiveYears"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceived_6c3dd1c5-a7b5-4d9a-9376-229b8582eea3" xlink:to="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedFiveYears_2c8f68b6-3b46-4d00-bb41-8ba9e4d5a3ff" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/LeasesLeasesScheduleofundiscountedcashflowsforsalestypeandoperatingleasesDetails_1" xlink:type="simple" xlink:href="ldos-20210101.xsd#LeasesLeasesScheduleofundiscountedcashflowsforsalestypeandoperatingleasesDetails_1"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/LeasesLeasesScheduleofundiscountedcashflowsforsalestypeandoperatingleasesDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceived_9cbc4e48-b819-4470-86d2-f5813af712d5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceived"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivable_4beaf467-f5d3-4513-a8e1-a13196bc0a6d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivable"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceived_9cbc4e48-b819-4470-86d2-f5813af712d5" xlink:to="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivable_4beaf467-f5d3-4513-a8e1-a13196bc0a6d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivableUndiscountedExcessAmount_4b388b0e-6812-42a9-9e7e-bdbd11280b0e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivableUndiscountedExcessAmount"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceived_9cbc4e48-b819-4470-86d2-f5813af712d5" xlink:to="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivableUndiscountedExcessAmount_4b388b0e-6812-42a9-9e7e-bdbd11280b0e" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/FairValueMeasurements" xlink:type="simple" xlink:href="ldos-20210101.xsd#FairValueMeasurements"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/FairValueMeasurements" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/FairValueMeasurementsTables" xlink:type="simple" xlink:href="ldos-20210101.xsd#FairValueMeasurementsTables"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/FairValueMeasurementsTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/FairValueMeasuresFinancialInstrumentsMeasuredatFairValueonRecurringBasisDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#FairValueMeasuresFinancialInstrumentsMeasuredatFairValueonRecurringBasisDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/FairValueMeasuresFinancialInstrumentsMeasuredatFairValueonRecurringBasisDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/FairValueMeasurementsNarrativeDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#FairValueMeasurementsNarrativeDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/FairValueMeasurementsNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/DerivativeInstruments" xlink:type="simple" xlink:href="ldos-20210101.xsd#DerivativeInstruments"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/DerivativeInstruments" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/DerivativeInstrumentsandHedgingActivitiesTables" xlink:type="simple" xlink:href="ldos-20210101.xsd#DerivativeInstrumentsandHedgingActivitiesTables"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/DerivativeInstrumentsandHedgingActivitiesTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/DerivativeInstrumentsInterestrateswapsDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#DerivativeInstrumentsInterestrateswapsDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/DerivativeInstrumentsInterestrateswapsDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/DerivativeInstrumentsNarrativeDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#DerivativeInstrumentsNarrativeDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/DerivativeInstrumentsNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/DerivativeInstrumentsEffectofCashFlowHedgeDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#DerivativeInstrumentsEffectofCashFlowHedgeDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/DerivativeInstrumentsEffectofCashFlowHedgeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/Debt" xlink:type="simple" xlink:href="ldos-20210101.xsd#Debt"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/Debt" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/DebtTables" xlink:type="simple" xlink:href="ldos-20210101.xsd#DebtTables"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/DebtTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/DebtSummaryofdebtDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#DebtSummaryofdebtDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/DebtSummaryofdebtDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities_625bac3b-9876-4602-817d-b6572f6d6021" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebt_564b72dd-bc42-410f-8f3e-0385d4b8a67b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SecuredDebt"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities_625bac3b-9876-4602-817d-b6572f6d6021" xlink:to="loc_us-gaap_SecuredDebt_564b72dd-bc42-410f-8f3e-0385d4b8a67b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnsecuredDebt_8e219f82-20b0-4c8e-8a93-750746f2e02e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_UnsecuredDebt"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities_625bac3b-9876-4602-817d-b6572f6d6021" xlink:to="loc_us-gaap_UnsecuredDebt_8e219f82-20b0-4c8e-8a93-750746f2e02e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_NotesPayableAndFinanceLeases_213a12ae-7034-4b8d-80cf-7726cf74c9d1" xlink:href="ldos-20210101.xsd#ldos_NotesPayableAndFinanceLeases"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities_625bac3b-9876-4602-817d-b6572f6d6021" xlink:to="loc_ldos_NotesPayableAndFinanceLeases_213a12ae-7034-4b8d-80cf-7726cf74c9d1" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/DebtSummaryofdebtDetails_1" xlink:type="simple" xlink:href="ldos-20210101.xsd#DebtSummaryofdebtDetails_1"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/DebtSummaryofdebtDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities_8d733b8d-267b-4bd0-b3a7-ae0d28f21b2f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent_d948245e-26bd-414c-b1d5-3f7a5a82dc7a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities_8d733b8d-267b-4bd0-b3a7-ae0d28f21b2f" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent_d948245e-26bd-414c-b1d5-3f7a5a82dc7a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_799b68ee-25f6-4c4d-8a60-ad1635caab8c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligations"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities_8d733b8d-267b-4bd0-b3a7-ae0d28f21b2f" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_799b68ee-25f6-4c4d-8a60-ad1635caab8c" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/DebtNarrativeDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#DebtNarrativeDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/DebtNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/DebtScheduleofMaturitiesofNotesPayableandLongTermDebtDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#DebtScheduleofMaturitiesofNotesPayableandLongTermDebtDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/DebtScheduleofMaturitiesofNotesPayableandLongTermDebtDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities_6511b395-39bb-4564-8fd6-16c68c8ea996" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_LongTermDebtBeforeUnamortizedDiscount_1fc7c515-7de9-4ec7-96d4-cfa1dbd20a27" xlink:href="ldos-20210101.xsd#ldos_LongTermDebtBeforeUnamortizedDiscount"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities_6511b395-39bb-4564-8fd6-16c68c8ea996" xlink:to="loc_ldos_LongTermDebtBeforeUnamortizedDiscount_1fc7c515-7de9-4ec7-96d4-cfa1dbd20a27" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_f2bad2c5-c651-4f55-953f-c6a06d8b396a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities_6511b395-39bb-4564-8fd6-16c68c8ea996" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_f2bad2c5-c651-4f55-953f-c6a06d8b396a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_LongTermDebtBeforeUnamortizedDiscount_e5757955-d81c-4406-b06f-6a00a10ecd67" xlink:href="ldos-20210101.xsd#ldos_LongTermDebtBeforeUnamortizedDiscount"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_4c636119-112e-496f-8b73-47c7eb79eb0d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ldos_LongTermDebtBeforeUnamortizedDiscount_e5757955-d81c-4406-b06f-6a00a10ecd67" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_4c636119-112e-496f-8b73-47c7eb79eb0d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_3f806ca3-aef5-461a-b056-7167bcb77b6e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ldos_LongTermDebtBeforeUnamortizedDiscount_e5757955-d81c-4406-b06f-6a00a10ecd67" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_3f806ca3-aef5-461a-b056-7167bcb77b6e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_79348675-fcf7-4888-b7f6-e10cdc504dfe" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ldos_LongTermDebtBeforeUnamortizedDiscount_e5757955-d81c-4406-b06f-6a00a10ecd67" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_79348675-fcf7-4888-b7f6-e10cdc504dfe" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_ea0078bc-717b-4858-bd33-7c0f49b8645d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ldos_LongTermDebtBeforeUnamortizedDiscount_e5757955-d81c-4406-b06f-6a00a10ecd67" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_ea0078bc-717b-4858-bd33-7c0f49b8645d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive_3156acaf-4bf5-4990-ac56-96c4caa632e4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ldos_LongTermDebtBeforeUnamortizedDiscount_e5757955-d81c-4406-b06f-6a00a10ecd67" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive_3156acaf-4bf5-4990-ac56-96c4caa632e4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive_9884afbd-0c4a-4f18-8421-32c7e4c731de" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ldos_LongTermDebtBeforeUnamortizedDiscount_e5757955-d81c-4406-b06f-6a00a10ecd67" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive_9884afbd-0c4a-4f18-8421-32c7e4c731de" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/AccumulatedOtherComprehensiveLoss" xlink:type="simple" xlink:href="ldos-20210101.xsd#AccumulatedOtherComprehensiveLoss"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/AccumulatedOtherComprehensiveLoss" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/AccumulatedOtherComprehensiveLossTables" xlink:type="simple" xlink:href="ldos-20210101.xsd#AccumulatedOtherComprehensiveLossTables"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/AccumulatedOtherComprehensiveLossTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/AccumulatedOtherComprehensiveLossDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#AccumulatedOtherComprehensiveLossDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/AccumulatedOtherComprehensiveLossDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/CompositionofCertainFinancialStatementCaptions" xlink:type="simple" xlink:href="ldos-20210101.xsd#CompositionofCertainFinancialStatementCaptions"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/CompositionofCertainFinancialStatementCaptions" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/CompositionofCertainFinancialStatementCaptionsTables" xlink:type="simple" xlink:href="ldos-20210101.xsd#CompositionofCertainFinancialStatementCaptionsTables"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/CompositionofCertainFinancialStatementCaptionsTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/CompositionofCertainFinancialStatementCaptionsScheduleofCertainFinancialStatementCaptionsDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#CompositionofCertainFinancialStatementCaptionsScheduleofCertainFinancialStatementCaptionsDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/CompositionofCertainFinancialStatementCaptionsScheduleofCertainFinancialStatementCaptionsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_8c6b74a0-cd89-4f48-94cb-cfbc52ebd8b9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EmployeeRelatedLiabilitiesCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_SalariesBonusesAndAmountsWithheldFromEmployeesCompensation_297c7cb4-4e1d-4b5e-9840-0a2b43ee3f16" xlink:href="ldos-20210101.xsd#ldos_SalariesBonusesAndAmountsWithheldFromEmployeesCompensation"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_8c6b74a0-cd89-4f48-94cb-cfbc52ebd8b9" xlink:to="loc_ldos_SalariesBonusesAndAmountsWithheldFromEmployeesCompensation_297c7cb4-4e1d-4b5e-9840-0a2b43ee3f16" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedVacationCurrent_d845b4d8-c3e3-48ce-8fbd-2bf6e28e222f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccruedVacationCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_8c6b74a0-cd89-4f48-94cb-cfbc52ebd8b9" xlink:to="loc_us-gaap_AccruedVacationCurrent_d845b4d8-c3e3-48ce-8fbd-2bf6e28e222f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_48102be7-fa2b-4c63-acbb-20e11ea676eb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherAssetsNoncurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsMiscellaneous_6cb259b7-87c2-4eae-9322-8d6452e5c8dc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherAssetsMiscellaneous"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAssetsNoncurrent_48102be7-fa2b-4c63-acbb-20e11ea676eb" xlink:to="loc_us-gaap_OtherAssetsMiscellaneous_6cb259b7-87c2-4eae-9322-8d6452e5c8dc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestments_dec464de-585b-4831-ac4a-e15188c30769" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquityMethodInvestments"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAssetsNoncurrent_48102be7-fa2b-4c63-acbb-20e11ea676eb" xlink:to="loc_us-gaap_EquityMethodInvestments_dec464de-585b-4831-ac4a-e15188c30769" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_TransitionCostsandProjectAssetsNetNoncurrent_62215811-25ce-4237-a180-c098a029b466" xlink:href="ldos-20210101.xsd#ldos_TransitionCostsandProjectAssetsNetNoncurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAssetsNoncurrent_48102be7-fa2b-4c63-acbb-20e11ea676eb" xlink:to="loc_ldos_TransitionCostsandProjectAssetsNetNoncurrent_62215811-25ce-4237-a180-c098a029b466" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsCurrent_be0a1a8c-7f06-463a-a617-97b33b383a70" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherAssetsCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_PrepaidContractCosts_04e1d88b-8c60-40d2-b9c8-70a11d9880e5" xlink:href="ldos-20210101.xsd#ldos_PrepaidContractCosts"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAssetsCurrent_be0a1a8c-7f06-463a-a617-97b33b383a70" xlink:to="loc_ldos_PrepaidContractCosts_04e1d88b-8c60-40d2-b9c8-70a11d9880e5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_TransitionCostsandProjectAssetsNetCurrent_0652d576-7acf-49a7-bfed-4908fe75d7ed" xlink:href="ldos-20210101.xsd#ldos_TransitionCostsandProjectAssetsNetCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAssetsCurrent_be0a1a8c-7f06-463a-a617-97b33b383a70" xlink:to="loc_ldos_TransitionCostsandProjectAssetsNetCurrent_0652d576-7acf-49a7-bfed-4908fe75d7ed" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsMiscellaneousCurrent_8ac73988-6bfe-450d-8707-cead41bd912b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherAssetsMiscellaneousCurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAssetsCurrent_be0a1a8c-7f06-463a-a617-97b33b383a70" xlink:to="loc_us-gaap_OtherAssetsMiscellaneousCurrent_8ac73988-6bfe-450d-8707-cead41bd912b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashCurrent_c4ad4ca8-32fa-4acb-adab-82939bf84b46" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RestrictedCashCurrent"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAssetsCurrent_be0a1a8c-7f06-463a-a617-97b33b383a70" xlink:to="loc_us-gaap_RestrictedCashCurrent_c4ad4ca8-32fa-4acb-adab-82939bf84b46" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_6f92b58c-d34f-4917-9ee5-a89d8be03087" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableCurrent_0d77d86e-e803-4f5d-8c80-585e4a1b5ffb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountsPayableCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_6f92b58c-d34f-4917-9ee5-a89d8be03087" xlink:to="loc_us-gaap_AccountsPayableCurrent_0d77d86e-e803-4f5d-8c80-585e4a1b5ffb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityCurrent_439039d4-38ac-49ad-972c-f1ca3436b977" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ContractWithCustomerLiabilityCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_6f92b58c-d34f-4917-9ee5-a89d8be03087" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityCurrent_439039d4-38ac-49ad-972c-f1ca3436b977" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAccountsPayableAndAccruedLiabilities_04faaa4a-1ad9-432d-839b-a420e7e260f4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherAccountsPayableAndAccruedLiabilities"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_6f92b58c-d34f-4917-9ee5-a89d8be03087" xlink:to="loc_us-gaap_OtherAccountsPayableAndAccruedLiabilities_04faaa4a-1ad9-432d-839b-a420e7e260f4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_0d60169c-47ad-4005-9554-3e059f3425f5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccruedLiabilitiesCurrent"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_6f92b58c-d34f-4917-9ee5-a89d8be03087" xlink:to="loc_us-gaap_AccruedLiabilitiesCurrent_0d60169c-47ad-4005-9554-3e059f3425f5" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/CompositionofCertainFinancialStatementCaptionsCondensedIncomeStatementDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#CompositionofCertainFinancialStatementCaptionsCondensedIncomeStatementDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/CompositionofCertainFinancialStatementCaptionsCondensedIncomeStatementDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_1f125a39-370a-446a-bdd5-e3874be1f191" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCurrencyTransactionGainLossRealized_fb2c238a-18d9-4412-baae-7151e1d2276e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ForeignCurrencyTransactionGainLossRealized"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherNonoperatingIncomeExpense_1f125a39-370a-446a-bdd5-e3874be1f191" xlink:to="loc_us-gaap_ForeignCurrencyTransactionGainLossRealized_fb2c238a-18d9-4412-baae-7151e1d2276e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_OtherIncomeExpenseNet_3a5b6b78-5206-4421-812b-645ca13e62fd" xlink:href="ldos-20210101.xsd#ldos_OtherIncomeExpenseNet"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherNonoperatingIncomeExpense_1f125a39-370a-446a-bdd5-e3874be1f191" xlink:to="loc_ldos_OtherIncomeExpenseNet_3a5b6b78-5206-4421-812b-645ca13e62fd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_3086b933-1d08-458f-b405-848510613d3b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherNonoperatingIncomeExpense_1f125a39-370a-446a-bdd5-e3874be1f191" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_3086b933-1d08-458f-b405-848510613d3b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfBusiness_778ee71d-fd19-4d88-ada3-d429b58a0075" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GainLossOnSaleOfBusiness"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherNonoperatingIncomeExpense_1f125a39-370a-446a-bdd5-e3874be1f191" xlink:to="loc_us-gaap_GainLossOnSaleOfBusiness_778ee71d-fd19-4d88-ada3-d429b58a0075" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeExpenseNet_189261ea-f5c1-4996-802d-ad0dd3ed937f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestIncomeExpenseNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpense_acf474cc-3379-4ef6-b6c8-f788069a7316" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestExpense"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InterestIncomeExpenseNet_189261ea-f5c1-4996-802d-ad0dd3ed937f" xlink:to="loc_us-gaap_InterestExpense_acf474cc-3379-4ef6-b6c8-f788069a7316" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIncomeNet_6287ec58-7aee-4caf-9c6e-f9ed047e4911" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InvestmentIncomeNet"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InterestIncomeExpenseNet_189261ea-f5c1-4996-802d-ad0dd3ed937f" xlink:to="loc_us-gaap_InvestmentIncomeNet_6287ec58-7aee-4caf-9c6e-f9ed047e4911" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/EarningsPerShareEPS" xlink:type="simple" xlink:href="ldos-20210101.xsd#EarningsPerShareEPS"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/EarningsPerShareEPS" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/EarningsPerShareEPSTables" xlink:type="simple" xlink:href="ldos-20210101.xsd#EarningsPerShareEPSTables"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/EarningsPerShareEPSTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/EarningsPerShareEPSReconciliationofWeightedAverageNumberofSharesOutstandingDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#EarningsPerShareEPSReconciliationofWeightedAverageNumberofSharesOutstandingDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/EarningsPerShareEPSReconciliationofWeightedAverageNumberofSharesOutstandingDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_d6256322-c4b8-472b-bafb-445de5f9760f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_5b4710c2-c02c-4b8d-b926-9dbadc80afb5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_d6256322-c4b8-472b-bafb-445de5f9760f" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_5b4710c2-c02c-4b8d-b926-9dbadc80afb5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_1eec2d7b-08ac-47ef-9dd0-9780aae13ed0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_d6256322-c4b8-472b-bafb-445de5f9760f" xlink:to="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_1eec2d7b-08ac-47ef-9dd0-9780aae13ed0" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/EarningsPerShareEPSNarrativeDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#EarningsPerShareEPSNarrativeDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/EarningsPerShareEPSNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/StockBasedCompensation" xlink:type="simple" xlink:href="ldos-20210101.xsd#StockBasedCompensation"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/StockBasedCompensation" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/StockBasedCompensationTables" xlink:type="simple" xlink:href="ldos-20210101.xsd#StockBasedCompensationTables"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/StockBasedCompensationTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/StockBasedCompensationAdditionalInformationDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#StockBasedCompensationAdditionalInformationDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/StockBasedCompensationAdditionalInformationDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/StockBasedCompensationScheduleofStockBasedCompensationandRelatedTaxBenefitsRecognizedDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#StockBasedCompensationScheduleofStockBasedCompensationandRelatedTaxBenefitsRecognizedDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/StockBasedCompensationScheduleofStockBasedCompensationandRelatedTaxBenefitsRecognizedDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/StockBasedCompensationStockoptionsDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#StockBasedCompensationStockoptionsDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/StockBasedCompensationStockoptionsDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/StockBasedCompensationScheduleofWeightedAverageGrantDateFairValueandAssumptionsUsedDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#StockBasedCompensationScheduleofWeightedAverageGrantDateFairValueandAssumptionsUsedDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/StockBasedCompensationScheduleofWeightedAverageGrantDateFairValueandAssumptionsUsedDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/StockBasedCompensationScheduleofStockOptionActivityDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#StockBasedCompensationScheduleofStockOptionActivityDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/StockBasedCompensationScheduleofStockOptionActivityDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/StockBasedCompensationScheduleofRSUandAwardsActivityDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#StockBasedCompensationScheduleofRSUandAwardsActivityDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/StockBasedCompensationScheduleofRSUandAwardsActivityDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/StockBasedCompensationScheduleofPerformanceBasedStockAwardActivityDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#StockBasedCompensationScheduleofPerformanceBasedStockAwardActivityDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/StockBasedCompensationScheduleofPerformanceBasedStockAwardActivityDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/IncomeTaxes" xlink:type="simple" xlink:href="ldos-20210101.xsd#IncomeTaxes"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/IncomeTaxes" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/IncomeTaxesTables" xlink:type="simple" xlink:href="ldos-20210101.xsd#IncomeTaxesTables"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/IncomeTaxesTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/IncomeTaxesNarrativeDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#IncomeTaxesNarrativeDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/IncomeTaxesNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/IncomeTaxesScheduleofProvisionforIncomeTaxesDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#IncomeTaxesScheduleofProvisionforIncomeTaxesDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/IncomeTaxesScheduleofProvisionforIncomeTaxesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_e573d5d1-cce9-4bfb-a57b-d33312c3a008" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFederalIncomeTaxExpenseBenefit_e4a87571-98fd-4374-b455-198f6c83b4df" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredFederalIncomeTaxExpenseBenefit"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_e573d5d1-cce9-4bfb-a57b-d33312c3a008" xlink:to="loc_us-gaap_DeferredFederalIncomeTaxExpenseBenefit_e4a87571-98fd-4374-b455-198f6c83b4df" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit_664d1b65-ef3e-4bc1-b7d3-c2911b7a8640" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_e573d5d1-cce9-4bfb-a57b-d33312c3a008" xlink:to="loc_us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit_664d1b65-ef3e-4bc1-b7d3-c2911b7a8640" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrentFederalTaxExpenseBenefit_729fcafb-3710-4c96-ad99-33c28e0d5c03" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CurrentFederalTaxExpenseBenefit"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_e573d5d1-cce9-4bfb-a57b-d33312c3a008" xlink:to="loc_us-gaap_CurrentFederalTaxExpenseBenefit_729fcafb-3710-4c96-ad99-33c28e0d5c03" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrentForeignTaxExpenseBenefit_430fb62b-fd70-4cff-8c6e-be00c5151660" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CurrentForeignTaxExpenseBenefit"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_e573d5d1-cce9-4bfb-a57b-d33312c3a008" xlink:to="loc_us-gaap_CurrentForeignTaxExpenseBenefit_430fb62b-fd70-4cff-8c6e-be00c5151660" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredForeignIncomeTaxExpenseBenefit_4294e2e6-f038-4ddf-9d69-efa9b9847c7a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredForeignIncomeTaxExpenseBenefit"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_e573d5d1-cce9-4bfb-a57b-d33312c3a008" xlink:to="loc_us-gaap_DeferredForeignIncomeTaxExpenseBenefit_4294e2e6-f038-4ddf-9d69-efa9b9847c7a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrentStateAndLocalTaxExpenseBenefit_ed4641c6-5142-49db-bb47-9ec8865a7fa9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CurrentStateAndLocalTaxExpenseBenefit"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_e573d5d1-cce9-4bfb-a57b-d33312c3a008" xlink:to="loc_us-gaap_CurrentStateAndLocalTaxExpenseBenefit_ed4641c6-5142-49db-bb47-9ec8865a7fa9" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/IncomeTaxesScheduleofReconciliationofProvisionforIncomeTaxesDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#IncomeTaxesScheduleofReconciliationofProvisionforIncomeTaxesDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/IncomeTaxesScheduleofReconciliationofProvisionforIncomeTaxesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_a3d127b9-2783-4cf7-862c-6ce296e4022b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate_2ee4c545-76f3-4c05-b171-2bc540dbd889" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_a3d127b9-2783-4cf7-862c-6ce296e4022b" xlink:to="loc_us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate_2ee4c545-76f3-4c05-b171-2bc540dbd889" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes_c765f21e-451d-46a0-800e-34bb6b04eec9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_a3d127b9-2783-4cf7-862c-6ce296e4022b" xlink:to="loc_us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes_c765f21e-451d-46a0-800e-34bb6b04eec9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitAmount_872e6d62-d008-4e93-9115-fac5d1117cc1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitAmount"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_a3d127b9-2783-4cf7-862c-6ce296e4022b" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitAmount_872e6d62-d008-4e93-9115-fac5d1117cc1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationTaxCreditsResearch_40c3d475-5b1d-4514-adf4-1dadd5c4fcc7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxReconciliationTaxCreditsResearch"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_a3d127b9-2783-4cf7-862c-6ce296e4022b" xlink:to="loc_us-gaap_IncomeTaxReconciliationTaxCreditsResearch_40c3d475-5b1d-4514-adf4-1dadd5c4fcc7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance_a1be63d8-f942-42b1-8dd4-0587cbc08b77" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_a3d127b9-2783-4cf7-862c-6ce296e4022b" xlink:to="loc_us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance_a1be63d8-f942-42b1-8dd4-0587cbc08b77" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_EffectiveIncomeTaxRateReconciliationStockBasisinSubsidiaryHeldforSale_6929e944-6ccc-4d0b-8be1-97abfd32aaac" xlink:href="ldos-20210101.xsd#ldos_EffectiveIncomeTaxRateReconciliationStockBasisinSubsidiaryHeldforSale"/>
    <link:calculationArc order="6" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_a3d127b9-2783-4cf7-862c-6ce296e4022b" xlink:to="loc_ldos_EffectiveIncomeTaxRateReconciliationStockBasisinSubsidiaryHeldforSale_6929e944-6ccc-4d0b-8be1-97abfd32aaac" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationTaxContingencies_845ec04a-aed6-4d37-a899-02b017bff2fa" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxReconciliationTaxContingencies"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_a3d127b9-2783-4cf7-862c-6ce296e4022b" xlink:to="loc_us-gaap_IncomeTaxReconciliationTaxContingencies_845ec04a-aed6-4d37-a899-02b017bff2fa" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends_30f8897f-7e48-4a49-9428-41af38d39d52" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends"/>
    <link:calculationArc order="8" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_a3d127b9-2783-4cf7-862c-6ce296e4022b" xlink:to="loc_us-gaap_IncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends_30f8897f-7e48-4a49-9428-41af38d39d52" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_EffectiveIncomeTaxRateReconciliationImpactOfForeignOperations_12fee8a1-7084-4246-a9fe-ce4a32229a1a" xlink:href="ldos-20210101.xsd#ldos_EffectiveIncomeTaxRateReconciliationImpactOfForeignOperations"/>
    <link:calculationArc order="9" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_a3d127b9-2783-4cf7-862c-6ce296e4022b" xlink:to="loc_ldos_EffectiveIncomeTaxRateReconciliationImpactOfForeignOperations_12fee8a1-7084-4246-a9fe-ce4a32229a1a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_EffectiveIncomeTaxRateReconciliationTaxableConversionofSubsidiary_4e2443a6-f041-4fcb-aeb0-573056c3d24b" xlink:href="ldos-20210101.xsd#ldos_EffectiveIncomeTaxRateReconciliationTaxableConversionofSubsidiary"/>
    <link:calculationArc order="10" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_a3d127b9-2783-4cf7-862c-6ce296e4022b" xlink:to="loc_ldos_EffectiveIncomeTaxRateReconciliationTaxableConversionofSubsidiary_4e2443a6-f041-4fcb-aeb0-573056c3d24b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate_28c8f102-363a-42dc-afaf-234bac43e003" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate"/>
    <link:calculationArc order="11" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_a3d127b9-2783-4cf7-862c-6ce296e4022b" xlink:to="loc_us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate_28c8f102-363a-42dc-afaf-234bac43e003" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationOtherAdjustments_2a441d78-0f25-4a48-974a-de6e37bc4b20" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxReconciliationOtherAdjustments"/>
    <link:calculationArc order="12" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_a3d127b9-2783-4cf7-862c-6ce296e4022b" xlink:to="loc_us-gaap_IncomeTaxReconciliationOtherAdjustments_2a441d78-0f25-4a48-974a-de6e37bc4b20" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/IncomeTaxesScheduleofDeferredTaxAssetsLiabilitiesDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#IncomeTaxesScheduleofDeferredTaxAssetsLiabilitiesDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/IncomeTaxesScheduleofDeferredTaxAssetsLiabilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsGross_d3d6e41d-83e0-4526-8763-0b3625bfc43c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsGross"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_DeferredTaxAssetsOperatingLeaseLiabilities_669e4119-f527-4b54-8894-19fc733e59a6" xlink:href="ldos-20210101.xsd#ldos_DeferredTaxAssetsOperatingLeaseLiabilities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_d3d6e41d-83e0-4526-8763-0b3625bfc43c" xlink:to="loc_ldos_DeferredTaxAssetsOperatingLeaseLiabilities_669e4119-f527-4b54-8894-19fc733e59a6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsCompensatedAbsences_2d400680-bdc4-4d80-a291-7485ca2ba40a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsCompensatedAbsences"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_d3d6e41d-83e0-4526-8763-0b3625bfc43c" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsCompensatedAbsences_2d400680-bdc4-4d80-a291-7485ca2ba40a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves_f38ecba0-ccab-4beb-a1cb-864363ffc5ff" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_d3d6e41d-83e0-4526-8763-0b3625bfc43c" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves_f38ecba0-ccab-4beb-a1cb-864363ffc5ff" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation_e6239815-f026-4986-9353-e8daef642a92" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_d3d6e41d-83e0-4526-8763-0b3625bfc43c" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation_e6239815-f026-4986-9353-e8daef642a92" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_DeferredTaxAssetsTaxCreditAndNetOperatingLossCarryforwards_817314a4-f5b1-4f16-aea7-47c0f69f363d" xlink:href="ldos-20210101.xsd#ldos_DeferredTaxAssetsTaxCreditAndNetOperatingLossCarryforwards"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_d3d6e41d-83e0-4526-8763-0b3625bfc43c" xlink:to="loc_ldos_DeferredTaxAssetsTaxCreditAndNetOperatingLossCarryforwards_817314a4-f5b1-4f16-aea7-47c0f69f363d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost_18909736-698d-47a1-b3c6-ccae3c68178a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_d3d6e41d-83e0-4526-8763-0b3625bfc43c" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost_18909736-698d-47a1-b3c6-ccae3c68178a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsOtherComprehensiveLoss_048223e8-c07b-47f6-be3b-1eeb92821250" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsOtherComprehensiveLoss"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_d3d6e41d-83e0-4526-8763-0b3625bfc43c" xlink:to="loc_us-gaap_DeferredTaxAssetsOtherComprehensiveLoss_048223e8-c07b-47f6-be3b-1eeb92821250" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsDeferredRent_a6ff2234-2354-476e-ae54-30c49641e510" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsDeferredRent"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_d3d6e41d-83e0-4526-8763-0b3625bfc43c" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsDeferredRent_a6ff2234-2354-476e-ae54-30c49641e510" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsInvestments_fd05bc16-bafc-44fd-bed9-81ca56f5b035" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsInvestments"/>
    <link:calculationArc order="9" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_d3d6e41d-83e0-4526-8763-0b3625bfc43c" xlink:to="loc_us-gaap_DeferredTaxAssetsInvestments_fd05bc16-bafc-44fd-bed9-81ca56f5b035" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsOther_17a18833-e656-4ef3-865c-5c5afe609466" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsOther"/>
    <link:calculationArc order="10" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_d3d6e41d-83e0-4526-8763-0b3625bfc43c" xlink:to="loc_us-gaap_DeferredTaxAssetsOther_17a18833-e656-4ef3-865c-5c5afe609466" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilities_afc20324-0859-4a50-9a42-99fc4d89e858" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxLiabilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilities_eaf4455a-58e1-4688-adf3-ae7b57d78f53" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredIncomeTaxLiabilities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxLiabilities_afc20324-0859-4a50-9a42-99fc4d89e858" xlink:to="loc_us-gaap_DeferredIncomeTaxLiabilities_eaf4455a-58e1-4688-adf3-ae7b57d78f53" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsNet_bec7715e-0fd2-46fe-a221-8efe59faf474" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsNet"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxLiabilities_afc20324-0859-4a50-9a42-99fc4d89e858" xlink:to="loc_us-gaap_DeferredTaxAssetsNet_bec7715e-0fd2-46fe-a221-8efe59faf474" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilities_ad52f82e-2b55-47ff-868c-36443e1271d1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredIncomeTaxLiabilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment_db00cb85-b031-4bad-b454-e452e8c3353b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxLiabilities_ad52f82e-2b55-47ff-868c-36443e1271d1" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment_db00cb85-b031-4bad-b454-e452e8c3353b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesTaxDeferredIncome_3194f3e6-4506-453b-8d33-02f8a40904e9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxLiabilitiesTaxDeferredIncome"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxLiabilities_ad52f82e-2b55-47ff-868c-36443e1271d1" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesTaxDeferredIncome_3194f3e6-4506-453b-8d33-02f8a40904e9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesLeasingArrangements_9f488f4e-4ce9-44b0-968d-a8034af1ba64" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxLiabilitiesLeasingArrangements"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxLiabilities_ad52f82e-2b55-47ff-868c-36443e1271d1" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesLeasingArrangements_9f488f4e-4ce9-44b0-968d-a8034af1ba64" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets_5645329f-4d78-455c-b16f-08d91a52eaa2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxLiabilities_ad52f82e-2b55-47ff-868c-36443e1271d1" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets_5645329f-4d78-455c-b16f-08d91a52eaa2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesOther_bf7d9679-693a-4006-be86-d00e9edac4b1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxLiabilitiesOther"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxLiabilities_ad52f82e-2b55-47ff-868c-36443e1271d1" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesOther_bf7d9679-693a-4006-be86-d00e9edac4b1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_DeferredTaxLiabilityTaxDeferredExpensesCompensationAndBenefitsEmployeeBenefitContributions_5139fe59-d729-48e0-8fe9-5fd8f921cb18" xlink:href="ldos-20210101.xsd#ldos_DeferredTaxLiabilityTaxDeferredExpensesCompensationAndBenefitsEmployeeBenefitContributions"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxLiabilities_ad52f82e-2b55-47ff-868c-36443e1271d1" xlink:to="loc_ldos_DeferredTaxLiabilityTaxDeferredExpensesCompensationAndBenefitsEmployeeBenefitContributions_5139fe59-d729-48e0-8fe9-5fd8f921cb18" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsNet_2cc391cc-f9c8-4344-8bbb-1b5a23ece286" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsGross_23acca6f-0b7f-496b-b754-de7235561065" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsGross"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsNet_2cc391cc-f9c8-4344-8bbb-1b5a23ece286" xlink:to="loc_us-gaap_DeferredTaxAssetsGross_23acca6f-0b7f-496b-b754-de7235561065" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsValuationAllowance_fc2a7a60-8a0b-4d73-a0ab-a0000b920637" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsValuationAllowance"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsNet_2cc391cc-f9c8-4344-8bbb-1b5a23ece286" xlink:to="loc_us-gaap_DeferredTaxAssetsValuationAllowance_fc2a7a60-8a0b-4d73-a0ab-a0000b920637" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/IncomeTaxesScheduleofBalanceSheetDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#IncomeTaxesScheduleofBalanceSheetDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/IncomeTaxesScheduleofBalanceSheetDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/IncomeTaxesScheduleofChangesinUnrecognizedTaxBenefitsDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#IncomeTaxesScheduleofChangesinUnrecognizedTaxBenefitsDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/IncomeTaxesScheduleofChangesinUnrecognizedTaxBenefitsDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/RetirementPlans" xlink:type="simple" xlink:href="ldos-20210101.xsd#RetirementPlans"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/RetirementPlans" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/RetirementPlansDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#RetirementPlansDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/RetirementPlansDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFundedStatusOfPlan_279561ad-584f-4d0e-bd89-bfbbe4fc5735" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanFundedStatusOfPlan"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanBenefitObligation_606d5f47-2353-42ee-99aa-343a4de20573" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanBenefitObligation"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanFundedStatusOfPlan_279561ad-584f-4d0e-bd89-bfbbe4fc5735" xlink:to="loc_us-gaap_DefinedBenefitPlanBenefitObligation_606d5f47-2353-42ee-99aa-343a4de20573" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_03684567-a962-441d-8281-e4746eac98c4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanFundedStatusOfPlan_279561ad-584f-4d0e-bd89-bfbbe4fc5735" xlink:to="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_03684567-a962-441d-8281-e4746eac98c4" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/SupplementaryCashFlowInformationandRestrictedCash" xlink:type="simple" xlink:href="ldos-20210101.xsd#SupplementaryCashFlowInformationandRestrictedCash"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/SupplementaryCashFlowInformationandRestrictedCash" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/SupplementaryCashFlowInformationandRestrictedCashTables" xlink:type="simple" xlink:href="ldos-20210101.xsd#SupplementaryCashFlowInformationandRestrictedCashTables"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/SupplementaryCashFlowInformationandRestrictedCashTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/SupplementaryCashFlowInformationandRestrictedCashSupplementaryCashFlowInformationDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#SupplementaryCashFlowInformationandRestrictedCashSupplementaryCashFlowInformationDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/SupplementaryCashFlowInformationandRestrictedCashSupplementaryCashFlowInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_93e73a88-8614-4210-9c86-de7723412b69" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalents_c80cd2e6-44e2-459b-b99e-7413ee45d15d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RestrictedCashAndCashEquivalents"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_93e73a88-8614-4210-9c86-de7723412b69" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalents_c80cd2e6-44e2-459b-b99e-7413ee45d15d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_750b2e5b-4268-4f88-97cb-cdac1ac219a4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_93e73a88-8614-4210-9c86-de7723412b69" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_750b2e5b-4268-4f88-97cb-cdac1ac219a4" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/SupplementaryCashFlowInformationandRestrictedCashNarrativeDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#SupplementaryCashFlowInformationandRestrictedCashNarrativeDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/SupplementaryCashFlowInformationandRestrictedCashNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/BusinessSegments" xlink:type="simple" xlink:href="ldos-20210101.xsd#BusinessSegments"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/BusinessSegments" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/BusinessSegmentsTables" xlink:type="simple" xlink:href="ldos-20210101.xsd#BusinessSegmentsTables"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/BusinessSegmentsTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/BusinessSegmentsAdditionalInformationDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#BusinessSegmentsAdditionalInformationDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/BusinessSegmentsAdditionalInformationDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/BusinessSegmentsScheduleofSegmentReportingInformationbySegmentDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#BusinessSegmentsScheduleofSegmentReportingInformationbySegmentDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/BusinessSegmentsScheduleofSegmentReportingInformationbySegmentDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/BusinessSegmentsScheduleofTotalRevenuePercentagesContributabletoSpecificGovernmentAgenciesDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#BusinessSegmentsScheduleofTotalRevenuePercentagesContributabletoSpecificGovernmentAgenciesDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/BusinessSegmentsScheduleofTotalRevenuePercentagesContributabletoSpecificGovernmentAgenciesDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/Contingencies" xlink:type="simple" xlink:href="ldos-20210101.xsd#Contingencies"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/Contingencies" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/ContingenciesDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#ContingenciesDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/ContingenciesDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/Commitments" xlink:type="simple" xlink:href="ldos-20210101.xsd#Commitments"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/Commitments" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/CommitmentsTables" xlink:type="simple" xlink:href="ldos-20210101.xsd#CommitmentsTables"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/CommitmentsTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/CommitmentsNarrativeDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#CommitmentsNarrativeDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/CommitmentsNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/CommitmentsFutureExpirationsMaturityTableDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#CommitmentsFutureExpirationsMaturityTableDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/CommitmentsFutureExpirationsMaturityTableDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ldos_GuaranteedObligation_1106266b-2e95-429d-af15-609e56f51a10" xlink:href="ldos-20210101.xsd#ldos_GuaranteedObligation"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_GuaranteedObligationMaturityYearFour_b713947f-deec-4043-94a8-01d2416641aa" xlink:href="ldos-20210101.xsd#ldos_GuaranteedObligationMaturityYearFour"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ldos_GuaranteedObligation_1106266b-2e95-429d-af15-609e56f51a10" xlink:to="loc_ldos_GuaranteedObligationMaturityYearFour_b713947f-deec-4043-94a8-01d2416641aa" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_GuaranteedObligationMaturityYearTwo_61d76fe0-003f-421f-94bb-3f31911bc1e8" xlink:href="ldos-20210101.xsd#ldos_GuaranteedObligationMaturityYearTwo"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ldos_GuaranteedObligation_1106266b-2e95-429d-af15-609e56f51a10" xlink:to="loc_ldos_GuaranteedObligationMaturityYearTwo_61d76fe0-003f-421f-94bb-3f31911bc1e8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_GuaranteedObligationMaturityYearThree_d1bec397-fce7-408f-9e46-03cd6b0cd5a6" xlink:href="ldos-20210101.xsd#ldos_GuaranteedObligationMaturityYearThree"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ldos_GuaranteedObligation_1106266b-2e95-429d-af15-609e56f51a10" xlink:to="loc_ldos_GuaranteedObligationMaturityYearThree_d1bec397-fce7-408f-9e46-03cd6b0cd5a6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_GuaranteedObligationMaturityAfterYearFive_5b6eb996-3aa3-4161-84ec-3175cbc0373f" xlink:href="ldos-20210101.xsd#ldos_GuaranteedObligationMaturityAfterYearFive"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ldos_GuaranteedObligation_1106266b-2e95-429d-af15-609e56f51a10" xlink:to="loc_ldos_GuaranteedObligationMaturityAfterYearFive_5b6eb996-3aa3-4161-84ec-3175cbc0373f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_GuaranteedObligationMaturityYearOne_45dacf6d-bc8c-422c-864b-2d4e61b129ab" xlink:href="ldos-20210101.xsd#ldos_GuaranteedObligationMaturityYearOne"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ldos_GuaranteedObligation_1106266b-2e95-429d-af15-609e56f51a10" xlink:to="loc_ldos_GuaranteedObligationMaturityYearOne_45dacf6d-bc8c-422c-864b-2d4e61b129ab" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_GuaranteedObligationMaturityYearFive_398cf5e9-e6f4-4a0d-a8d4-a0010eaf4392" xlink:href="ldos-20210101.xsd#ldos_GuaranteedObligationMaturityYearFive"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ldos_GuaranteedObligation_1106266b-2e95-429d-af15-609e56f51a10" xlink:to="loc_ldos_GuaranteedObligationMaturityYearFive_398cf5e9-e6f4-4a0d-a8d4-a0010eaf4392" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/SubsequentEvents" xlink:type="simple" xlink:href="ldos-20210101.xsd#SubsequentEvents"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/SubsequentEvents" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.leidos.com/role/SubsequentEventsDetails" xlink:type="simple" xlink:href="ldos-20210101.xsd#SubsequentEventsDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/SubsequentEventsDetails" xlink:type="extended"/>
</link:linkbase>
