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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2025 Workiva-->
<!--r:c1f31e42-bf91-47d2-8357-d7c8371dcb85,g:861f3913-e5e0-4b40-9aee-532a07df3861-->
<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/CONSOLIDATEDBALANCESHEETS" xlink:type="simple" xlink:href="ldos-20250103.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_Liabilities_e2cc4082-e29c-4ae8-b70b-c9cbfa5b8223" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_Liabilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_dc9082c3-f03b-46d6-a816-0f315d7933c1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_e2cc4082-e29c-4ae8-b70b-c9cbfa5b8223" xlink:to="loc_us-gaap_LiabilitiesCurrent_dc9082c3-f03b-46d6-a816-0f315d7933c1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_0fe98fa9-ecbb-4869-9fb8-b3330e442500" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_Liabilities_e2cc4082-e29c-4ae8-b70b-c9cbfa5b8223" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_0fe98fa9-ecbb-4869-9fb8-b3330e442500" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_98d7edbe-e1d6-40cf-9de5-4a0c6823ab36" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_e2cc4082-e29c-4ae8-b70b-c9cbfa5b8223" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_98d7edbe-e1d6-40cf-9de5-4a0c6823ab36" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_72e11092-0078-4691-8c2c-1293e3d8f3ca" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligations"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_e2cc4082-e29c-4ae8-b70b-c9cbfa5b8223" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_72e11092-0078-4691-8c2c-1293e3d8f3ca" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_3fabe57c-b9d8-4977-85d3-70c200d7a591" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AssetsCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsCurrent_fea994ee-dd8c-45b2-ad83-8850415fc0b5" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_3fabe57c-b9d8-4977-85d3-70c200d7a591" xlink:to="loc_us-gaap_OtherAssetsCurrent_fea994ee-dd8c-45b2-ad83-8850415fc0b5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryNet_a0bb6889-49eb-407f-8c6c-23516aab227e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_3fabe57c-b9d8-4977-85d3-70c200d7a591" xlink:to="loc_us-gaap_InventoryNet_a0bb6889-49eb-407f-8c6c-23516aab227e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivablesNetCurrent_9483a146-3134-4e3b-99fb-c62ba2025577" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_3fabe57c-b9d8-4977-85d3-70c200d7a591" xlink:to="loc_us-gaap_ReceivablesNetCurrent_9483a146-3134-4e3b-99fb-c62ba2025577" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_dbc48d1f-54fc-4443-b0cc-bd0a28b5be22" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_3fabe57c-b9d8-4977-85d3-70c200d7a591" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_dbc48d1f-54fc-4443-b0cc-bd0a28b5be22" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_bfad6686-56b7-40ab-b030-e77fc61d6b8d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_7377a286-f7ec-4a8a-8c68-f4c35c1b167f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_bfad6686-56b7-40ab-b030-e77fc61d6b8d" xlink:to="loc_us-gaap_StockholdersEquity_7377a286-f7ec-4a8a-8c68-f4c35c1b167f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterest_29eb076d-1afb-4a26-888c-501c232b3834" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_bfad6686-56b7-40ab-b030-e77fc61d6b8d" xlink:to="loc_us-gaap_MinorityInterest_29eb076d-1afb-4a26-888c-501c232b3834" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_2b4b52a9-3700-45d3-86d9-bfdfdae9b431" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_5b9f0444-e5d7-4200-8891-a6daa0aa5cbc" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_2b4b52a9-3700-45d3-86d9-bfdfdae9b431" xlink:to="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_5b9f0444-e5d7-4200-8891-a6daa0aa5cbc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_b485b204-d0ba-4363-a8c3-901faa757df8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_2b4b52a9-3700-45d3-86d9-bfdfdae9b431" xlink:to="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_b485b204-d0ba-4363-a8c3-901faa757df8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtCurrent_06c43082-739c-4f6c-80c6-10f4732af685" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_2b4b52a9-3700-45d3-86d9-bfdfdae9b431" xlink:to="loc_us-gaap_DebtCurrent_06c43082-739c-4f6c-80c6-10f4732af685" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_6a699c18-8e46-4d9e-917b-45b0fa729f1a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockValue_5414dec8-5d29-4718-9d08-7c63e3d51a6c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_6a699c18-8e46-4d9e-917b-45b0fa729f1a" xlink:to="loc_us-gaap_PreferredStockValue_5414dec8-5d29-4718-9d08-7c63e3d51a6c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValue_d7fba941-942b-4f1b-8e9c-7d5a2a8560dd" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_6a699c18-8e46-4d9e-917b-45b0fa729f1a" xlink:to="loc_us-gaap_CommonStockValue_d7fba941-942b-4f1b-8e9c-7d5a2a8560dd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapital_8b06a8cb-a3dd-4618-9516-6d99661edd2c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_6a699c18-8e46-4d9e-917b-45b0fa729f1a" xlink:to="loc_us-gaap_AdditionalPaidInCapital_8b06a8cb-a3dd-4618-9516-6d99661edd2c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_36748275-22b8-428f-9682-0bb3201717d3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_6a699c18-8e46-4d9e-917b-45b0fa729f1a" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_36748275-22b8-428f-9682-0bb3201717d3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_ba192eda-10d3-416d-bc0f-c934926ae8d9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_6a699c18-8e46-4d9e-917b-45b0fa729f1a" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_ba192eda-10d3-416d-bc0f-c934926ae8d9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_c586989d-6ffc-485a-b91c-4d0622e9010c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_87f155b7-8029-4e0c-9288-5a4b733763e9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_Liabilities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_c586989d-6ffc-485a-b91c-4d0622e9010c" xlink:to="loc_us-gaap_Liabilities_87f155b7-8029-4e0c-9288-5a4b733763e9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingencies_79e2750b-b96b-4ff8-b445-00365546e6e0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CommitmentsAndContingencies"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_c586989d-6ffc-485a-b91c-4d0622e9010c" xlink:to="loc_us-gaap_CommitmentsAndContingencies_79e2750b-b96b-4ff8-b445-00365546e6e0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_acdd9fc9-2163-4e90-bf63-7f8e31ff27bd" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_c586989d-6ffc-485a-b91c-4d0622e9010c" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_acdd9fc9-2163-4e90-bf63-7f8e31ff27bd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_9189971f-8a05-461b-bd72-c8a1462c3d3a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_Assets"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_6a563dd3-397b-4915-8e7a-3e06a431276f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_9189971f-8a05-461b-bd72-c8a1462c3d3a" xlink:to="loc_us-gaap_Goodwill_6a563dd3-397b-4915-8e7a-3e06a431276f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_51a54a27-7afc-4854-9dd8-591e7a799526" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_9189971f-8a05-461b-bd72-c8a1462c3d3a" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_51a54a27-7afc-4854-9dd8-591e7a799526" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_7a19703d-aca1-4a17-9a3b-ff0df048c207" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_9189971f-8a05-461b-bd72-c8a1462c3d3a" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_7a19703d-aca1-4a17-9a3b-ff0df048c207" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_dfad5899-5fae-471e-87ff-fefdd705d012" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_9189971f-8a05-461b-bd72-c8a1462c3d3a" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_dfad5899-5fae-471e-87ff-fefdd705d012" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_26fc69b1-15c8-4f26-8966-d1e93eae5dab" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_9189971f-8a05-461b-bd72-c8a1462c3d3a" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_26fc69b1-15c8-4f26-8966-d1e93eae5dab" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_59d5b239-edb1-46a3-89e4-ab21289b8399" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_9189971f-8a05-461b-bd72-c8a1462c3d3a" xlink:to="loc_us-gaap_AssetsCurrent_59d5b239-edb1-46a3-89e4-ab21289b8399" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS" xlink:type="simple" xlink:href="ldos-20250103.xsd#CONSOLIDATEDSTATEMENTSOFOPERATIONS"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_5847c32e-6892-487f-8f0a-6254cf76c4e0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_01b8d0e6-94cb-471d-a00d-b1c27eebbbb7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_5847c32e-6892-487f-8f0a-6254cf76c4e0" xlink:to="loc_us-gaap_OperatingIncomeLoss_01b8d0e6-94cb-471d-a00d-b1c27eebbbb7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_d5836ace-587f-4a93-bc90-11f6d0768705" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_5847c32e-6892-487f-8f0a-6254cf76c4e0" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_d5836ace-587f-4a93-bc90-11f6d0768705" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeExpenseNonoperatingNet_597c88c3-1693-43f2-8f20-d4073de8e440" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_InterestIncomeExpenseNonoperatingNet"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_5847c32e-6892-487f-8f0a-6254cf76c4e0" xlink:to="loc_us-gaap_InterestIncomeExpenseNonoperatingNet_597c88c3-1693-43f2-8f20-d4073de8e440" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_4f2160ca-80b7-4396-8d61-119f2ce114f4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ProfitLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_39bdf855-57cc-4973-a1c8-a771e89f0de0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_4f2160ca-80b7-4396-8d61-119f2ce114f4" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_39bdf855-57cc-4973-a1c8-a771e89f0de0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_cb6ff21a-ea29-46e8-aaff-ea5ccb235dbf" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_4f2160ca-80b7-4396-8d61-119f2ce114f4" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_cb6ff21a-ea29-46e8-aaff-ea5ccb235dbf" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_d1227adf-186f-44df-b237-f3e4464ee158" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_cd552a97-6f11-421e-a6b9-4cd360faebc8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_Revenues"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_d1227adf-186f-44df-b237-f3e4464ee158" xlink:to="loc_us-gaap_Revenues_cd552a97-6f11-421e-a6b9-4cd360faebc8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfRevenue_e6570b41-01a8-4d8c-a295-77988cae36b5" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CostOfRevenue"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_d1227adf-186f-44df-b237-f3e4464ee158" xlink:to="loc_us-gaap_CostOfRevenue_e6570b41-01a8-4d8c-a295-77988cae36b5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_485ee47c-5b13-4784-981b-45ea2c25d044" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SellingGeneralAndAdministrativeExpense"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_d1227adf-186f-44df-b237-f3e4464ee158" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_485ee47c-5b13-4784-981b-45ea2c25d044" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_AcquisitionIntegrationAndRestructuringCosts_c251e35e-dd18-4059-ac81-8d2203bbfd55" xlink:href="ldos-20250103.xsd#ldos_AcquisitionIntegrationAndRestructuringCosts"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_d1227adf-186f-44df-b237-f3e4464ee158" xlink:to="loc_ldos_AcquisitionIntegrationAndRestructuringCosts_c251e35e-dd18-4059-ac81-8d2203bbfd55" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_AssetImpairmentChargesExcludingGoodwill_be121cb2-992a-4134-a14d-238da4ab0e11" xlink:href="ldos-20250103.xsd#ldos_AssetImpairmentChargesExcludingGoodwill"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_d1227adf-186f-44df-b237-f3e4464ee158" xlink:to="loc_ldos_AssetImpairmentChargesExcludingGoodwill_be121cb2-992a-4134-a14d-238da4ab0e11" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromEquityMethodInvestments_349418c5-9bc6-44cd-8ca1-735b2aed971c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeLossFromEquityMethodInvestments"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_d1227adf-186f-44df-b237-f3e4464ee158" xlink:to="loc_us-gaap_IncomeLossFromEquityMethodInvestments_349418c5-9bc6-44cd-8ca1-735b2aed971c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillAndIntangibleAssetImpairment_9b9ea41d-4b6c-4fbe-9d15-2d47b92c398d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_GoodwillAndIntangibleAssetImpairment"/>
    <link:calculationArc order="7" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_d1227adf-186f-44df-b237-f3e4464ee158" xlink:to="loc_us-gaap_GoodwillAndIntangibleAssetImpairment_9b9ea41d-4b6c-4fbe-9d15-2d47b92c398d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_3c8aadf8-97cc-45b5-98eb-3914d10a085b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NetIncomeLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_5a0b0a82-c4fb-4295-abad-339ab9b0447c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_3c8aadf8-97cc-45b5-98eb-3914d10a085b" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_5a0b0a82-c4fb-4295-abad-339ab9b0447c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_2085b8bc-f47d-48f6-9e4d-4bb95492b277" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_3c8aadf8-97cc-45b5-98eb-3914d10a085b" xlink:to="loc_us-gaap_ProfitLoss_2085b8bc-f47d-48f6-9e4d-4bb95492b277" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME" xlink:type="simple" xlink:href="ldos-20250103.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_fd5979df-4272-4607-b923-53bc66286a5e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_e7252f12-bf26-46d1-8359-bbdc66e05b21" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_fd5979df-4272-4607-b923-53bc66286a5e" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_e7252f12-bf26-46d1-8359-bbdc66e05b21" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax_7c58f604-53b6-4d2e-8f0d-10c3f04b6f8c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_fd5979df-4272-4607-b923-53bc66286a5e" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax_7c58f604-53b6-4d2e-8f0d-10c3f04b6f8c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax_357a316e-da47-41b9-9c19-bada104604f2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_fd5979df-4272-4607-b923-53bc66286a5e" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax_357a316e-da47-41b9-9c19-bada104604f2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_e165c4a6-9cc2-4190-92ab-d03e1fa970ff" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_a51608f8-ea78-4b06-9344-245efb60c6e8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_e165c4a6-9cc2-4190-92ab-d03e1fa970ff" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_a51608f8-ea78-4b06-9344-245efb60c6e8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_8c2b84a5-bc50-445f-86d3-54bc677c2982" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_e165c4a6-9cc2-4190-92ab-d03e1fa970ff" xlink:to="loc_us-gaap_ProfitLoss_8c2b84a5-bc50-445f-86d3-54bc677c2982" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_09d8e7d2-781d-49f2-a4c3-e8bd6b699912" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ComprehensiveIncomeNetOfTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_20b19783-0b51-4229-95cb-f695d11b543e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_09d8e7d2-781d-49f2-a4c3-e8bd6b699912" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_20b19783-0b51-4229-95cb-f695d11b543e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_860e00ce-f930-48cd-816a-75f1c2db4e85" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_09d8e7d2-781d-49f2-a4c3-e8bd6b699912" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_860e00ce-f930-48cd-816a-75f1c2db4e85" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS" xlink:type="simple" xlink:href="ldos-20250103.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_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_78fb737e-8f07-437f-9f15-e29bcf9fbf7f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_2f42a46d-53ab-4677-a281-bef0759a3615" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_78fb737e-8f07-437f-9f15-e29bcf9fbf7f" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_2f42a46d-53ab-4677-a281-bef0759a3615" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCash_be074518-2c6c-4960-bab7-7ded1ad2947d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestrictedCash"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_78fb737e-8f07-437f-9f15-e29bcf9fbf7f" xlink:to="loc_us-gaap_RestrictedCash_be074518-2c6c-4960-bab7-7ded1ad2947d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_7a8131a2-e87e-4d9a-a492-105eea8efa98" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested_473e2170-cd29-4720-8424-7d3187d329fc" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_7a8131a2-e87e-4d9a-a492-105eea8efa98" xlink:to="loc_us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested_473e2170-cd29-4720-8424-7d3187d329fc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_b0a416c0-5349-4d8e-a869-742dee5f0bf9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_7a8131a2-e87e-4d9a-a492-105eea8efa98" xlink:to="loc_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_b0a416c0-5349-4d8e-a869-742dee5f0bf9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_66b59c19-fe77-4192-87a3-e7914f2f3075" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_7a8131a2-e87e-4d9a-a492-105eea8efa98" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_66b59c19-fe77-4192-87a3-e7914f2f3075" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireProductiveAssets_96c8798e-ddcc-4fd8-9a27-223c6c2c64b8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PaymentsToAcquireProductiveAssets"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_7a8131a2-e87e-4d9a-a492-105eea8efa98" xlink:to="loc_us-gaap_PaymentsToAcquireProductiveAssets_96c8798e-ddcc-4fd8-9a27-223c6c2c64b8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_5634213e-72a2-4728-bd73-d5586bf75dd6" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PaymentsForProceedsFromOtherInvestingActivities"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_7a8131a2-e87e-4d9a-a492-105eea8efa98" xlink:to="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_5634213e-72a2-4728-bd73-d5586bf75dd6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_d7e0d85f-205f-4221-8386-a5cb70723851" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfOrdinaryDividends_57a1b640-e7e8-402f-9a55-f62470662d02" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_d7e0d85f-205f-4221-8386-a5cb70723851" xlink:to="loc_us-gaap_PaymentsOfOrdinaryDividends_57a1b640-e7e8-402f-9a55-f62470662d02" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfLongTermDebtAndCapitalSecurities_ddeb3458-a190-499e-aa8b-42b0ae85d589" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RepaymentsOfLongTermDebtAndCapitalSecurities"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_d7e0d85f-205f-4221-8386-a5cb70723851" xlink:to="loc_us-gaap_RepaymentsOfLongTermDebtAndCapitalSecurities_ddeb3458-a190-499e-aa8b-42b0ae85d589" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfEquity_ef3e64de-878b-43c0-a7fd-5ea2558bdb71" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PaymentsForRepurchaseOfEquity"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_d7e0d85f-205f-4221-8386-a5cb70723851" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfEquity_ef3e64de-878b-43c0-a7fd-5ea2558bdb71" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDebtIssuanceCosts_ba4ae167-6dce-4a03-9d77-4c2104ff3f70" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PaymentsOfDebtIssuanceCosts"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_d7e0d85f-205f-4221-8386-a5cb70723851" xlink:to="loc_us-gaap_PaymentsOfDebtIssuanceCosts_ba4ae167-6dce-4a03-9d77-4c2104ff3f70" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOrSaleOfEquity_03c0f0ca-6984-4ca1-b418-f5e2b5d55ff0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ProceedsFromIssuanceOrSaleOfEquity"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_d7e0d85f-205f-4221-8386-a5cb70723851" xlink:to="loc_us-gaap_ProceedsFromIssuanceOrSaleOfEquity_03c0f0ca-6984-4ca1-b418-f5e2b5d55ff0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfDebt_41c2fdd4-0684-40d1-aec6-359afe582a27" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ProceedsFromIssuanceOfDebt"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_d7e0d85f-205f-4221-8386-a5cb70723851" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfDebt_41c2fdd4-0684-40d1-aec6-359afe582a27" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromPaymentsToMinorityShareholders_14a8debc-74a4-49e3-8133-290b74d04670" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ProceedsFromPaymentsToMinorityShareholders"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_d7e0d85f-205f-4221-8386-a5cb70723851" xlink:to="loc_us-gaap_ProceedsFromPaymentsToMinorityShareholders_14a8debc-74a4-49e3-8133-290b74d04670" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_0b7b932e-f988-4754-b858-9634dce1a576" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_d7e0d85f-205f-4221-8386-a5cb70723851" xlink:to="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_0b7b932e-f988-4754-b858-9634dce1a576" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_051b3853-dd11-4040-84a9-f816ecd28104" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_7ab5308d-389b-4697-be4b-0dbda04cba88" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_051b3853-dd11-4040-84a9-f816ecd28104" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_7ab5308d-389b-4697-be4b-0dbda04cba88" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_66612884-cdf9-43a1-9d85-e440c260ac08" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_051b3853-dd11-4040-84a9-f816ecd28104" xlink:to="loc_us-gaap_ShareBasedCompensation_66612884-cdf9-43a1-9d85-e440c260ac08" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_c1b2b903-166d-4c42-a760-204785b9de91" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_051b3853-dd11-4040-84a9-f816ecd28104" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_c1b2b903-166d-4c42-a760-204785b9de91" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_AssetImpairmentChargesExcludingGoodwill_c2099935-c7f4-4356-85fd-5a00bbddd7b5" xlink:href="ldos-20250103.xsd#ldos_AssetImpairmentChargesExcludingGoodwill"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_051b3853-dd11-4040-84a9-f816ecd28104" xlink:to="loc_ldos_AssetImpairmentChargesExcludingGoodwill_c2099935-c7f4-4356-85fd-5a00bbddd7b5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_IncreaseDecreaseInAccountsPayableAndAccruedLiabilitiesAndOtherNoncurrentLiabilities_c68f632b-16db-4138-8b87-d3f93a462714" xlink:href="ldos-20250103.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_051b3853-dd11-4040-84a9-f816ecd28104" xlink:to="loc_ldos_IncreaseDecreaseInAccountsPayableAndAccruedLiabilitiesAndOtherNoncurrentLiabilities_c68f632b-16db-4138-8b87-d3f93a462714" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities_38c6f17c-ae72-452b-8691-7da772242a0b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_051b3853-dd11-4040-84a9-f816ecd28104" xlink:to="loc_us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities_38c6f17c-ae72-452b-8691-7da772242a0b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInIncomeTaxes_0f075aa1-31fe-428b-bf08-865277bda984" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncreaseDecreaseInIncomeTaxes"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_051b3853-dd11-4040-84a9-f816ecd28104" xlink:to="loc_us-gaap_IncreaseDecreaseInIncomeTaxes_0f075aa1-31fe-428b-bf08-865277bda984" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInReceivables_691f07d6-ebfe-481f-b2e9-d359da62ca67" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncreaseDecreaseInReceivables"/>
    <link:calculationArc order="8" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_051b3853-dd11-4040-84a9-f816ecd28104" xlink:to="loc_us-gaap_IncreaseDecreaseInReceivables_691f07d6-ebfe-481f-b2e9-d359da62ca67" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_2731008b-7df6-4c46-bec0-52486d577c82" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ProfitLoss"/>
    <link:calculationArc order="9" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_051b3853-dd11-4040-84a9-f816ecd28104" xlink:to="loc_us-gaap_ProfitLoss_2731008b-7df6-4c46-bec0-52486d577c82" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_1440d24e-5e03-4623-adf7-9d5496e96af0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit"/>
    <link:calculationArc order="10" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_051b3853-dd11-4040-84a9-f816ecd28104" xlink:to="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_1440d24e-5e03-4623-adf7-9d5496e96af0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncashIncomeExpense_2882f7cc-e464-4a8d-a65d-c8829e82a270" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherNoncashIncomeExpense"/>
    <link:calculationArc order="11" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_051b3853-dd11-4040-84a9-f816ecd28104" xlink:to="loc_us-gaap_OtherNoncashIncomeExpense_2882f7cc-e464-4a8d-a65d-c8829e82a270" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillAndIntangibleAssetImpairment_5d6bb97a-6fc0-4b47-969e-266bb1199309" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_GoodwillAndIntangibleAssetImpairment"/>
    <link:calculationArc order="12" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_051b3853-dd11-4040-84a9-f816ecd28104" xlink:to="loc_us-gaap_GoodwillAndIntangibleAssetImpairment_5d6bb97a-6fc0-4b47-969e-266bb1199309" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_d7339f98-7a7b-4ea1-bc8b-20cfb18d7184" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_acc9bd57-dffc-476e-8ae2-600fea760e28" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_d7339f98-7a7b-4ea1-bc8b-20cfb18d7184" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_acc9bd57-dffc-476e-8ae2-600fea760e28" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_8a599be3-ebe4-4b92-bcca-c3129fcee37a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_d7339f98-7a7b-4ea1-bc8b-20cfb18d7184" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_8a599be3-ebe4-4b92-bcca-c3129fcee37a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_ab74c2e9-a7a3-4d2f-a878-db0f119ba0f4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_d7339f98-7a7b-4ea1-bc8b-20cfb18d7184" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_ab74c2e9-a7a3-4d2f-a878-db0f119ba0f4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_f68cf45e-6756-44dc-88d4-1920b278884b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_d7339f98-7a7b-4ea1-bc8b-20cfb18d7184" xlink:to="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_f68cf45e-6756-44dc-88d4-1920b278884b" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/SummaryofSignificantAccountingPoliciesChangesinEstimatesonContractsforthePeriodsPresentedDetails" xlink:type="simple" xlink:href="ldos-20250103.xsd#SummaryofSignificantAccountingPoliciesChangesinEstimatesonContractsforthePeriodsPresentedDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/SummaryofSignificantAccountingPoliciesChangesinEstimatesonContractsforthePeriodsPresentedDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ldos_IncreaseDecreaseInIncomeFromChangeInContractEstimates_f0a09836-ec23-4626-b008-7b7937a9e1ba" xlink:href="ldos-20250103.xsd#ldos_IncreaseDecreaseInIncomeFromChangeInContractEstimates"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_IncreaseInIncomeBeforeIncomeTaxesFromChangesInContractEstimates_eab6d606-5639-4b38-90f1-02f4cfe99645" xlink:href="ldos-20250103.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_f0a09836-ec23-4626-b008-7b7937a9e1ba" xlink:to="loc_ldos_IncreaseInIncomeBeforeIncomeTaxesFromChangesInContractEstimates_eab6d606-5639-4b38-90f1-02f4cfe99645" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_DecreaseInIncomeBeforeIncomeTaxesFromChangesInContractEstimates_121484a8-3bb3-40bc-9161-d70959b12ef0" xlink:href="ldos-20250103.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_f0a09836-ec23-4626-b008-7b7937a9e1ba" xlink:to="loc_ldos_DecreaseInIncomeBeforeIncomeTaxesFromChangesInContractEstimates_121484a8-3bb3-40bc-9161-d70959b12ef0" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/ReceivablesComponentsofReceivablesDetails" xlink:type="simple" xlink:href="ldos-20250103.xsd#ReceivablesComponentsofReceivablesDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/ReceivablesComponentsofReceivablesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_b7bfefd6-4b95-4b2c-b567-048e417d123f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AccountsReceivableNetCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BilledContractReceivables_b470c93f-f70b-4fec-bd85-3f636cce61c7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_b7bfefd6-4b95-4b2c-b567-048e417d123f" xlink:to="loc_us-gaap_BilledContractReceivables_b470c93f-f70b-4fec-bd85-3f636cce61c7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_e1803b3d-700f-4215-895b-0c7910f7f46d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_b7bfefd6-4b95-4b2c-b567-048e417d123f" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_e1803b3d-700f-4215-895b-0c7910f7f46d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnbilledContractsReceivable_fc0b0b79-a677-4f96-bfae-8db767f9809d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_b7bfefd6-4b95-4b2c-b567-048e417d123f" xlink:to="loc_us-gaap_UnbilledContractsReceivable_fc0b0b79-a677-4f96-bfae-8db767f9809d" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/InventoryDetails" xlink:type="simple" xlink:href="ldos-20250103.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_afe0eb61-b49e-4fa1-abea-8c627034f5c9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_InventoryNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryWorkInProcessNetOfReserves_48a4f273-8b2e-42fc-877d-9617fd7c5699" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_afe0eb61-b49e-4fa1-abea-8c627034f5c9" xlink:to="loc_us-gaap_InventoryWorkInProcessNetOfReserves_48a4f273-8b2e-42fc-877d-9617fd7c5699" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryRawMaterialsNetOfReserves_69950929-69b3-464c-b641-d50219120dd7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_afe0eb61-b49e-4fa1-abea-8c627034f5c9" xlink:to="loc_us-gaap_InventoryRawMaterialsNetOfReserves_69950929-69b3-464c-b641-d50219120dd7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryFinishedGoodsNetOfReserves_f989f022-6a36-49b3-8684-b4f760177864" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_afe0eb61-b49e-4fa1-abea-8c627034f5c9" xlink:to="loc_us-gaap_InventoryFinishedGoodsNetOfReserves_f989f022-6a36-49b3-8684-b4f760177864" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/GoodwillandIntangibleAssetsIntangibleAssetsDetails" xlink:type="simple" xlink:href="ldos-20250103.xsd#GoodwillandIntangibleAssetsIntangibleAssetsDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/GoodwillandIntangibleAssetsIntangibleAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_2ce55cbc-28aa-4861-9973-091f26a89a79" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_2e9a13f6-c2ae-4019-ab4d-e126e5b16588" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_2ce55cbc-28aa-4861-9973-091f26a89a79" xlink:to="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_2e9a13f6-c2ae-4019-ab4d-e126e5b16588" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_1c6debfa-3bb2-4d6f-a349-3778d7171881" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_2ce55cbc-28aa-4861-9973-091f26a89a79" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_1c6debfa-3bb2-4d6f-a349-3778d7171881" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_7edc9cc0-a17d-404b-8fc4-24ad4066b83c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IntangibleAssetsGrossExcludingGoodwill"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_61c6fada-b86a-4d4d-bc6f-bc9d823ed81d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_7edc9cc0-a17d-404b-8fc4-24ad4066b83c" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_61c6fada-b86a-4d4d-bc6f-bc9d823ed81d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_e7cd8ff9-e60b-4f33-9c2a-db0bbbcc4dbe" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_7edc9cc0-a17d-404b-8fc4-24ad4066b83c" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_e7cd8ff9-e60b-4f33-9c2a-db0bbbcc4dbe" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_1c998b5e-43e7-4c11-a719-36a90a1949f7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_31a5a2d8-6e55-4310-9122-b55e66846f8b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_1c998b5e-43e7-4c11-a719-36a90a1949f7" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_31a5a2d8-6e55-4310-9122-b55e66846f8b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_0cc2c290-2351-480b-b157-1be03b8cbd80" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_1c998b5e-43e7-4c11-a719-36a90a1949f7" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_0cc2c290-2351-480b-b157-1be03b8cbd80" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/GoodwillandIntangibleAssetsIntangibleAssetsDetails_1" xlink:type="simple" xlink:href="ldos-20250103.xsd#GoodwillandIntangibleAssetsIntangibleAssetsDetails_1"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/GoodwillandIntangibleAssetsIntangibleAssetsDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_c4a9fa69-a32b-425d-a5aa-9d17856420d0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_c2f999cf-b0cf-47ad-90fb-d44303452240" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_c4a9fa69-a32b-425d-a5aa-9d17856420d0" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_c2f999cf-b0cf-47ad-90fb-d44303452240" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_0cffb9a6-f71c-4ee7-9a23-f902a722572a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_c4a9fa69-a32b-425d-a5aa-9d17856420d0" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_0cffb9a6-f71c-4ee7-9a23-f902a722572a" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/GoodwillandIntangibleAssetsEstimatedAnnualAmortizationExpenseDetails" xlink:type="simple" xlink:href="ldos-20250103.xsd#GoodwillandIntangibleAssetsEstimatedAnnualAmortizationExpenseDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/GoodwillandIntangibleAssetsEstimatedAnnualAmortizationExpenseDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_a95617d0-6bc0-4aff-bef6-e356e44ebb6c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_e6a6693b-817d-415d-ae7e-7a4bd4f35e21" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_a95617d0-6bc0-4aff-bef6-e356e44ebb6c" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_e6a6693b-817d-415d-ae7e-7a4bd4f35e21" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive_8d0e868d-1429-4113-a84b-675b27897020" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_a95617d0-6bc0-4aff-bef6-e356e44ebb6c" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive_8d0e868d-1429-4113-a84b-675b27897020" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_ac588eb5-0df8-4e16-9390-13cfda3b66bb" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_a95617d0-6bc0-4aff-bef6-e356e44ebb6c" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_ac588eb5-0df8-4e16-9390-13cfda3b66bb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_8c5bd355-3617-4312-b760-1f60c64fd3e9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_a95617d0-6bc0-4aff-bef6-e356e44ebb6c" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_8c5bd355-3617-4312-b760-1f60c64fd3e9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_89192b5a-0681-4fcd-b196-896db31d4324" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_a95617d0-6bc0-4aff-bef6-e356e44ebb6c" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_89192b5a-0681-4fcd-b196-896db31d4324" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_5f5c6ee7-fc5e-4372-904a-00e835c77667" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_a95617d0-6bc0-4aff-bef6-e356e44ebb6c" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_5f5c6ee7-fc5e-4372-904a-00e835c77667" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/PropertyPlantandEquipmentPropertyPlantandEquipmentDetails" xlink:type="simple" xlink:href="ldos-20250103.xsd#PropertyPlantandEquipmentPropertyPlantandEquipmentDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/PropertyPlantandEquipmentPropertyPlantandEquipmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_c4e45d78-657d-484e-adfc-c6302ead0988" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization_b89d052b-4ac6-4330-ad5c-1c4d7cc48f92" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_c4e45d78-657d-484e-adfc-c6302ead0988" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization_b89d052b-4ac6-4330-ad5c-1c4d7cc48f92" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization_d87d2dfa-2a02-4a89-84eb-13634ade2ac4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_c4e45d78-657d-484e-adfc-c6302ead0988" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization_d87d2dfa-2a02-4a89-84eb-13634ade2ac4" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/LeasesROUAssetsandLeaseLiabilitiesDetails" xlink:type="simple" xlink:href="ldos-20250103.xsd#LeasesROUAssetsandLeaseLiabilitiesDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/LeasesROUAssetsandLeaseLiabilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ldos_LeaseRightOfUseAsset_4321437b-a585-4fb4-b8b6-502c963f9e10" xlink:href="ldos-20250103.xsd#ldos_LeaseRightOfUseAsset"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAsset_0a3d23ce-417f-4b9b-ad77-6f4987d1ff06" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_4321437b-a585-4fb4-b8b6-502c963f9e10" xlink:to="loc_us-gaap_FinanceLeaseRightOfUseAsset_0a3d23ce-417f-4b9b-ad77-6f4987d1ff06" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_e7466852-c745-43ec-aab5-46efbfd97ccc" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_4321437b-a585-4fb4-b8b6-502c963f9e10" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_e7466852-c745-43ec-aab5-46efbfd97ccc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_LeaseLiabilityNoncurrent_f938a2e5-94a1-48ed-953f-329075acc028" xlink:href="ldos-20250103.xsd#ldos_LeaseLiabilityNoncurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityNoncurrent_a597e7f7-4cd4-4d31-ba32-e911e63c8c00" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_f938a2e5-94a1-48ed-953f-329075acc028" xlink:to="loc_us-gaap_FinanceLeaseLiabilityNoncurrent_a597e7f7-4cd4-4d31-ba32-e911e63c8c00" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_9753daec-d9a0-4772-979c-fd9846a84b48" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_f938a2e5-94a1-48ed-953f-329075acc028" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_9753daec-d9a0-4772-979c-fd9846a84b48" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_LeaseLiabilityCurrent_da4b3f25-9b5d-4fa2-b7a0-2bf1a1429eaa" xlink:href="ldos-20250103.xsd#ldos_LeaseLiabilityCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityCurrent_25324ee3-b464-40c7-82fd-51d35dd601f1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_da4b3f25-9b5d-4fa2-b7a0-2bf1a1429eaa" xlink:to="loc_us-gaap_FinanceLeaseLiabilityCurrent_25324ee3-b464-40c7-82fd-51d35dd601f1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_11682715-ad64-4c4a-9864-e4a388db9dd4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_da4b3f25-9b5d-4fa2-b7a0-2bf1a1429eaa" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrent_11682715-ad64-4c4a-9864-e4a388db9dd4" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/LeasesLeaseCostDetails" xlink:type="simple" xlink:href="ldos-20250103.xsd#LeasesLeaseCostDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/LeasesLeaseCostDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseCost_46c9a5a9-cf6a-4806-89e8-21585a775b4a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LeaseCost"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_FinanceLeaseCost_e8b512dd-7c3d-4701-af5b-99c490a2b45f" xlink:href="ldos-20250103.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_46c9a5a9-cf6a-4806-89e8-21585a775b4a" xlink:to="loc_ldos_FinanceLeaseCost_e8b512dd-7c3d-4701-af5b-99c490a2b45f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseCost_5aa6391c-fae3-4544-ba05-2ab5335cc15a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_46c9a5a9-cf6a-4806-89e8-21585a775b4a" xlink:to="loc_us-gaap_OperatingLeaseCost_5aa6391c-fae3-4544-ba05-2ab5335cc15a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableLeaseCost_15a32fcc-f534-4b50-bfce-aab1c8da99f9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_46c9a5a9-cf6a-4806-89e8-21585a775b4a" xlink:to="loc_us-gaap_VariableLeaseCost_15a32fcc-f534-4b50-bfce-aab1c8da99f9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermLeaseCost_8199462c-7ffe-422f-9a75-8372ece26b3b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_46c9a5a9-cf6a-4806-89e8-21585a775b4a" xlink:to="loc_us-gaap_ShortTermLeaseCost_8199462c-7ffe-422f-9a75-8372ece26b3b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubleaseIncome_93e4ce85-e2c0-4175-b425-baab70e5f2ee" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_46c9a5a9-cf6a-4806-89e8-21585a775b4a" xlink:to="loc_us-gaap_SubleaseIncome_93e4ce85-e2c0-4175-b425-baab70e5f2ee" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_FinanceLeaseCost_bd72a079-366d-4e0e-8879-7db0e324a115" xlink:href="ldos-20250103.xsd#ldos_FinanceLeaseCost"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAssetAmortization_0afd1659-6303-4005-aa60-5d2151725bdd" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_bd72a079-366d-4e0e-8879-7db0e324a115" xlink:to="loc_us-gaap_FinanceLeaseRightOfUseAssetAmortization_0afd1659-6303-4005-aa60-5d2151725bdd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseInterestExpense_ec169bed-a19d-423f-81a1-b2c959bd0174" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_bd72a079-366d-4e0e-8879-7db0e324a115" xlink:to="loc_us-gaap_FinanceLeaseInterestExpense_ec169bed-a19d-423f-81a1-b2c959bd0174" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/LeasesFutureMinimumLeaseCommitmentsDetails" xlink:type="simple" xlink:href="ldos-20250103.xsd#LeasesFutureMinimumLeaseCommitmentsDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/LeasesFutureMinimumLeaseCommitmentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_52991ea0-8730-4fb4-9e0f-ada7b8091285" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_0d6b21dc-416d-48ac-9b4c-b609de45931e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_52991ea0-8730-4fb4-9e0f-ada7b8091285" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_0d6b21dc-416d-48ac-9b4c-b609de45931e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_4717e73d-9e38-4f07-84c8-48615cbd0aa6" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_52991ea0-8730-4fb4-9e0f-ada7b8091285" xlink:to="loc_us-gaap_OperatingLeaseLiability_4717e73d-9e38-4f07-84c8-48615cbd0aa6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_714f7a3e-19fb-4bc4-8e71-e216e4f9cce9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueNextTwelveMonths_ad2848a5-b837-4bbe-81da-8ce2f0021330" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_714f7a3e-19fb-4bc4-8e71-e216e4f9cce9" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueNextTwelveMonths_ad2848a5-b837-4bbe-81da-8ce2f0021330" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo_f03e9cbe-02b8-4648-8768-4a886ff114a8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_714f7a3e-19fb-4bc4-8e71-e216e4f9cce9" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo_f03e9cbe-02b8-4648-8768-4a886ff114a8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree_6cd15235-6163-4d1b-bdca-09b7d17c0051" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_714f7a3e-19fb-4bc4-8e71-e216e4f9cce9" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree_6cd15235-6163-4d1b-bdca-09b7d17c0051" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour_9d0114d7-23cb-4cb9-ae26-dd3293582b62" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_714f7a3e-19fb-4bc4-8e71-e216e4f9cce9" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour_9d0114d7-23cb-4cb9-ae26-dd3293582b62" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive_fba7d871-4187-420e-a89f-db80208a7833" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_714f7a3e-19fb-4bc4-8e71-e216e4f9cce9" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive_fba7d871-4187-420e-a89f-db80208a7833" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive_cdeeb42f-4f7b-4e6a-b23f-6ed6c205b735" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_714f7a3e-19fb-4bc4-8e71-e216e4f9cce9" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive_cdeeb42f-4f7b-4e6a-b23f-6ed6c205b735" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/LeasesFutureMinimumLeaseCommitmentsDetails_1" xlink:type="simple" xlink:href="ldos-20250103.xsd#LeasesFutureMinimumLeaseCommitmentsDetails_1"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/LeasesFutureMinimumLeaseCommitmentsDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_476cb304-48b9-4243-9985-eb3c8dc90c9a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_58d023d1-acce-481b-8ee0-a73e1df21478" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_476cb304-48b9-4243-9985-eb3c8dc90c9a" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_58d023d1-acce-481b-8ee0-a73e1df21478" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_0bd1ea9f-5050-4b04-91aa-03428da39a0d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_476cb304-48b9-4243-9985-eb3c8dc90c9a" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_0bd1ea9f-5050-4b04-91aa-03428da39a0d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_396e555a-1923-405f-a80c-bac9a468bf1b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_476cb304-48b9-4243-9985-eb3c8dc90c9a" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_396e555a-1923-405f-a80c-bac9a468bf1b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_ac988c0f-1d32-4976-80f5-217afd1d9afb" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_476cb304-48b9-4243-9985-eb3c8dc90c9a" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_ac988c0f-1d32-4976-80f5-217afd1d9afb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_8737b2cf-964d-4643-a113-be6df6e69f45" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_476cb304-48b9-4243-9985-eb3c8dc90c9a" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_8737b2cf-964d-4643-a113-be6df6e69f45" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_8480281f-7128-4903-9354-dd508b8219ff" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_476cb304-48b9-4243-9985-eb3c8dc90c9a" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_8480281f-7128-4903-9354-dd508b8219ff" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_84e6e984-6671-4eff-9d09-2a92f0b349d1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_28e7adf8-03a8-4b90-a5fc-bd0d2dd4ccc2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_84e6e984-6671-4eff-9d09-2a92f0b349d1" xlink:to="loc_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_28e7adf8-03a8-4b90-a5fc-bd0d2dd4ccc2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiability_5793cf1b-854a-4db3-996d-338825e1d886" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_84e6e984-6671-4eff-9d09-2a92f0b349d1" xlink:to="loc_us-gaap_FinanceLeaseLiability_5793cf1b-854a-4db3-996d-338825e1d886" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/LeasesComponentsofLeaseIncomeDetails" xlink:type="simple" xlink:href="ldos-20250103.xsd#LeasesComponentsofLeaseIncomeDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/LeasesComponentsofLeaseIncomeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesTypeLeaseSellingProfitLoss_beb219f7-e94c-4403-bd13-fa23413e405b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SalesTypeLeaseSellingProfitLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesTypeLeaseRevenue_66cd4ff5-dd6c-4705-99b7-c9d7d3b8592c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_beb219f7-e94c-4403-bd13-fa23413e405b" xlink:to="loc_us-gaap_SalesTypeLeaseRevenue_66cd4ff5-dd6c-4705-99b7-c9d7d3b8592c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsSoldSalesTypeLease_036f23d9-ace5-4d1a-90c7-bb25b13e8cab" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_beb219f7-e94c-4403-bd13-fa23413e405b" xlink:to="loc_us-gaap_CostOfGoodsSoldSalesTypeLease_036f23d9-ace5-4d1a-90c7-bb25b13e8cab" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesTypeLeaseLeaseIncome_da62e18f-6c20-4685-94e0-09339a5dc858" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SalesTypeLeaseLeaseIncome"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesTypeLeaseSellingProfitLoss_9f83385e-bf18-48be-9c07-137dbfb2cebe" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_da62e18f-6c20-4685-94e0-09339a5dc858" xlink:to="loc_us-gaap_SalesTypeLeaseSellingProfitLoss_9f83385e-bf18-48be-9c07-137dbfb2cebe" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesTypeLeaseInterestIncomeLeaseReceivable_e280654d-f6fb-4c01-8495-fe7ba19acab9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_da62e18f-6c20-4685-94e0-09339a5dc858" xlink:to="loc_us-gaap_SalesTypeLeaseInterestIncomeLeaseReceivable_e280654d-f6fb-4c01-8495-fe7ba19acab9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseIncome_766ddd24-77d4-4da3-be14-007cac93cb65" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LeaseIncome"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesTypeLeaseLeaseIncome_94085a5f-9365-48b9-b0ea-6a581c6e0edd" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_766ddd24-77d4-4da3-be14-007cac93cb65" xlink:to="loc_us-gaap_SalesTypeLeaseLeaseIncome_94085a5f-9365-48b9-b0ea-6a581c6e0edd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLeaseIncome_0e4ae4ec-b7d1-4bc6-a9e6-ec40622d6993" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_766ddd24-77d4-4da3-be14-007cac93cb65" xlink:to="loc_us-gaap_OperatingLeaseLeaseIncome_0e4ae4ec-b7d1-4bc6-a9e6-ec40622d6993" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/LeasesUndiscountedCashFlowsforSalesTypeandOperatingLeasesDetails" xlink:type="simple" xlink:href="ldos-20250103.xsd#LeasesUndiscountedCashFlowsforSalesTypeandOperatingLeasesDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/LeasesUndiscountedCashFlowsforSalesTypeandOperatingLeasesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceived_b383f42b-fb7d-4c3a-8e01-e6a60480f303" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceived"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedNextTwelveMonths_710bd8fa-8845-4008-ae51-dad6293b82a9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_b383f42b-fb7d-4c3a-8e01-e6a60480f303" xlink:to="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedNextTwelveMonths_710bd8fa-8845-4008-ae51-dad6293b82a9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedTwoYears_73fc18a0-2c57-43f9-a7e7-cba6b8a4fc1e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_b383f42b-fb7d-4c3a-8e01-e6a60480f303" xlink:to="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedTwoYears_73fc18a0-2c57-43f9-a7e7-cba6b8a4fc1e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThreeYears_fced37ba-36db-47b2-bb08-ecb279b39a38" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_b383f42b-fb7d-4c3a-8e01-e6a60480f303" xlink:to="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThreeYears_fced37ba-36db-47b2-bb08-ecb279b39a38" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFourYears_ef04954d-1daf-4ea5-b794-0e8132a0105d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_b383f42b-fb7d-4c3a-8e01-e6a60480f303" xlink:to="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFourYears_ef04954d-1daf-4ea5-b794-0e8132a0105d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFiveYears_e76a99f3-d082-4fce-8d43-a11771b91694" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_b383f42b-fb7d-4c3a-8e01-e6a60480f303" xlink:to="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFiveYears_e76a99f3-d082-4fce-8d43-a11771b91694" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceived_a17a2b62-e945-4291-b609-62ff1d0cae80" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LessorOperatingLeasePaymentsToBeReceived"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths_b299c1a7-95ed-41ad-9ab4-34feefccc058" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_a17a2b62-e945-4291-b609-62ff1d0cae80" xlink:to="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths_b299c1a7-95ed-41ad-9ab4-34feefccc058" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedTwoYears_cb902de9-c261-4bc8-a7c6-87b182e82e0f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_a17a2b62-e945-4291-b609-62ff1d0cae80" xlink:to="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedTwoYears_cb902de9-c261-4bc8-a7c6-87b182e82e0f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedThreeYears_86d905e1-981d-4fe3-b76c-6f5f8940fbfb" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_a17a2b62-e945-4291-b609-62ff1d0cae80" xlink:to="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedThreeYears_86d905e1-981d-4fe3-b76c-6f5f8940fbfb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedFourYears_8886cf3c-5c4a-45e2-8394-73574d4acddf" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_a17a2b62-e945-4291-b609-62ff1d0cae80" xlink:to="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedFourYears_8886cf3c-5c4a-45e2-8394-73574d4acddf" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedFiveYears_d0d2bcf4-7224-41f5-a0b9-647c266ac24c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_a17a2b62-e945-4291-b609-62ff1d0cae80" xlink:to="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedFiveYears_d0d2bcf4-7224-41f5-a0b9-647c266ac24c" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/LeasesUndiscountedCashFlowsforSalesTypeandOperatingLeasesDetails_1" xlink:type="simple" xlink:href="ldos-20250103.xsd#LeasesUndiscountedCashFlowsforSalesTypeandOperatingLeasesDetails_1"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/LeasesUndiscountedCashFlowsforSalesTypeandOperatingLeasesDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceived_885f6228-6228-4d90-80eb-21379eac7a84" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceived"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivable_2f4334c3-7ae0-4b50-8a98-5431f29da079" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_885f6228-6228-4d90-80eb-21379eac7a84" xlink:to="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivable_2f4334c3-7ae0-4b50-8a98-5431f29da079" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivableUndiscountedExcessAmount_98d560c0-4cab-4ede-90f9-5fb33df1014e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_885f6228-6228-4d90-80eb-21379eac7a84" xlink:to="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivableUndiscountedExcessAmount_98d560c0-4cab-4ede-90f9-5fb33df1014e" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/DebtCompanysDebtDetails" xlink:type="simple" xlink:href="ldos-20250103.xsd#DebtCompanysDebtDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/DebtCompanysDebtDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities_877b1004-6fdb-406e-9e77-26b01cb87903" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnsecuredDebt_4ad4ecfa-3914-4541-ab42-4926e9116753" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_UnsecuredDebt"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities_877b1004-6fdb-406e-9e77-26b01cb87903" xlink:to="loc_us-gaap_UnsecuredDebt_4ad4ecfa-3914-4541-ab42-4926e9116753" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_889aa996-f64e-4454-8bb5-2986f384e6fd" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_877b1004-6fdb-406e-9e77-26b01cb87903" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_889aa996-f64e-4454-8bb5-2986f384e6fd" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/DebtCompanysDebtDetails_1" xlink:type="simple" xlink:href="ldos-20250103.xsd#DebtCompanysDebtDetails_1"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/DebtCompanysDebtDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities_235208ef-27b0-4145-900c-31ba790b9ddb" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent_18135f7f-5a8d-4f8a-95fb-b228d235debd" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_235208ef-27b0-4145-900c-31ba790b9ddb" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent_18135f7f-5a8d-4f8a-95fb-b228d235debd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_b7a6d5bd-f836-454d-8b3b-8953cd8254bc" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_235208ef-27b0-4145-900c-31ba790b9ddb" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_b7a6d5bd-f836-454d-8b3b-8953cd8254bc" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/DebtMaturitiesofNotesPayableandLongTermDebtDetails" xlink:type="simple" xlink:href="ldos-20250103.xsd#DebtMaturitiesofNotesPayableandLongTermDebtDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/DebtMaturitiesofNotesPayableandLongTermDebtDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtLongtermAndShorttermCombinedAmount_30608fbb-88e0-430a-a80e-935ed89a81c3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtLongtermAndShorttermCombinedAmount"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_LongTermDebtBeforeUnamortizedDiscount_f86a33bc-1e52-4b14-ad32-108c70808129" xlink:href="ldos-20250103.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_DebtLongtermAndShorttermCombinedAmount_30608fbb-88e0-430a-a80e-935ed89a81c3" xlink:to="loc_ldos_LongTermDebtBeforeUnamortizedDiscount_f86a33bc-1e52-4b14-ad32-108c70808129" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_d3fbfad7-9952-4ce8-af4a-8e124cb55517" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_DebtLongtermAndShorttermCombinedAmount_30608fbb-88e0-430a-a80e-935ed89a81c3" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_d3fbfad7-9952-4ce8-af4a-8e124cb55517" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_LongTermDebtBeforeUnamortizedDiscount_759f1d4b-e1e5-4d1c-8b01-ffce386d1ee8" xlink:href="ldos-20250103.xsd#ldos_LongTermDebtBeforeUnamortizedDiscount"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_8a6cf4c7-c923-4d85-909b-d84d2457ff7b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_759f1d4b-e1e5-4d1c-8b01-ffce386d1ee8" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_8a6cf4c7-c923-4d85-909b-d84d2457ff7b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_f7f7a2ea-2fdd-40d9-b2e1-686d39053c2f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_759f1d4b-e1e5-4d1c-8b01-ffce386d1ee8" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_f7f7a2ea-2fdd-40d9-b2e1-686d39053c2f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_a704db43-c647-4dd4-a6c4-d1e9c1270fe2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_759f1d4b-e1e5-4d1c-8b01-ffce386d1ee8" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_a704db43-c647-4dd4-a6c4-d1e9c1270fe2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_ca7491e8-8b9d-4e17-a236-c30ec7e2d1d6" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_759f1d4b-e1e5-4d1c-8b01-ffce386d1ee8" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_ca7491e8-8b9d-4e17-a236-c30ec7e2d1d6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive_e3ffddd1-5a14-414c-a979-a079272b25bf" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_759f1d4b-e1e5-4d1c-8b01-ffce386d1ee8" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive_e3ffddd1-5a14-414c-a979-a079272b25bf" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive_d1a18248-b8b8-4cd6-8a45-ea50709bcf9f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_759f1d4b-e1e5-4d1c-8b01-ffce386d1ee8" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive_d1a18248-b8b8-4cd6-8a45-ea50709bcf9f" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/CompositionofCertainFinancialStatementCaptionsDetails" xlink:type="simple" xlink:href="ldos-20250103.xsd#CompositionofCertainFinancialStatementCaptionsDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/CompositionofCertainFinancialStatementCaptionsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_9558d0f8-97ac-4ca8-ad4a-00505b40fbdc" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableCurrent_ecc6f34d-eb51-4d4a-85f7-0c963b1130f6" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_9558d0f8-97ac-4ca8-ad4a-00505b40fbdc" xlink:to="loc_us-gaap_AccountsPayableCurrent_ecc6f34d-eb51-4d4a-85f7-0c963b1130f6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityCurrent_165d4edb-b254-4c7b-8104-ae273e21fc6d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_9558d0f8-97ac-4ca8-ad4a-00505b40fbdc" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityCurrent_165d4edb-b254-4c7b-8104-ae273e21fc6d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAccountsPayableAndAccruedLiabilities_50a57a31-b02c-4db2-b41a-aeb7fe320aeb" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_9558d0f8-97ac-4ca8-ad4a-00505b40fbdc" xlink:to="loc_us-gaap_OtherAccountsPayableAndAccruedLiabilities_50a57a31-b02c-4db2-b41a-aeb7fe320aeb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_6071339f-e0f2-4a77-994d-63b177f6b9af" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_9558d0f8-97ac-4ca8-ad4a-00505b40fbdc" xlink:to="loc_us-gaap_AccruedLiabilitiesCurrent_6071339f-e0f2-4a77-994d-63b177f6b9af" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsCurrent_39011ee8-9d79-4529-9a28-8062b7b1f288" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherAssetsCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_TransitionCostsandProjectAssetsNetCurrent_9d638f35-1610-4ac1-84e9-f8dcec7d27ed" xlink:href="ldos-20250103.xsd#ldos_TransitionCostsandProjectAssetsNetCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAssetsCurrent_39011ee8-9d79-4529-9a28-8062b7b1f288" xlink:to="loc_ldos_TransitionCostsandProjectAssetsNetCurrent_9d638f35-1610-4ac1-84e9-f8dcec7d27ed" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsMiscellaneousCurrent_2b59e63f-e292-46e9-8826-af49d343ad5f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherAssetsMiscellaneousCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAssetsCurrent_39011ee8-9d79-4529-9a28-8062b7b1f288" xlink:to="loc_us-gaap_OtherAssetsMiscellaneousCurrent_2b59e63f-e292-46e9-8826-af49d343ad5f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_f153b561-1a52-4b8d-9872-64eafc2a9592" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EmployeeRelatedLiabilitiesCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_SalariesBonusesAndAmountsWithheldFromEmployeesCompensation_712d4e97-ba1e-41b2-8a3b-b03e4ed24e74" xlink:href="ldos-20250103.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_f153b561-1a52-4b8d-9872-64eafc2a9592" xlink:to="loc_ldos_SalariesBonusesAndAmountsWithheldFromEmployeesCompensation_712d4e97-ba1e-41b2-8a3b-b03e4ed24e74" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedVacationCurrent_903e30f5-c6df-42be-887d-50877462f397" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_f153b561-1a52-4b8d-9872-64eafc2a9592" xlink:to="loc_us-gaap_AccruedVacationCurrent_903e30f5-c6df-42be-887d-50877462f397" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_fb12c7ef-e683-4df4-8123-38b4407d0446" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherAssetsNoncurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsMiscellaneous_c96fa3fa-863b-4add-b9da-f39b6204538a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_fb12c7ef-e683-4df4-8123-38b4407d0446" xlink:to="loc_us-gaap_OtherAssetsMiscellaneous_c96fa3fa-863b-4add-b9da-f39b6204538a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_DeferredTaxAssetsNoncurrent_576136ff-6b67-4521-aae4-345645087b52" xlink:href="ldos-20250103.xsd#ldos_DeferredTaxAssetsNoncurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAssetsNoncurrent_fb12c7ef-e683-4df4-8123-38b4407d0446" xlink:to="loc_ldos_DeferredTaxAssetsNoncurrent_576136ff-6b67-4521-aae4-345645087b52" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_TransitionCostsandProjectAssetsNetNoncurrent_d100cdbd-0a5c-4f22-bcab-bfac4ca08714" xlink:href="ldos-20250103.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_fb12c7ef-e683-4df4-8123-38b4407d0446" xlink:to="loc_ldos_TransitionCostsandProjectAssetsNetNoncurrent_d100cdbd-0a5c-4f22-bcab-bfac4ca08714" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/EarningsPerShareEPSWeightedAverageNumberofSharesusedtoComputeBasicandDilutedEPSDetails" xlink:type="simple" xlink:href="ldos-20250103.xsd#EarningsPerShareEPSWeightedAverageNumberofSharesusedtoComputeBasicandDilutedEPSDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/EarningsPerShareEPSWeightedAverageNumberofSharesusedtoComputeBasicandDilutedEPSDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_6fe7e691-481d-42fb-a576-627a61ef9e6b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_1cd0aa5f-311b-4b9e-ae90-8e939b722aba" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_6fe7e691-481d-42fb-a576-627a61ef9e6b" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_1cd0aa5f-311b-4b9e-ae90-8e939b722aba" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_3231efbf-ce23-480d-a87c-ad95fc3ccc57" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_6fe7e691-481d-42fb-a576-627a61ef9e6b" xlink:to="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_3231efbf-ce23-480d-a87c-ad95fc3ccc57" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/IncomeTaxesProvisionforIncomeTaxesDetails" xlink:type="simple" xlink:href="ldos-20250103.xsd#IncomeTaxesProvisionforIncomeTaxesDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/IncomeTaxesProvisionforIncomeTaxesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_d2f8dc67-ef63-4c6d-8d26-73ea0537876e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFederalIncomeTaxExpenseBenefit_59532b42-cbbc-47d7-b7c6-3ecdb73b1344" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_d2f8dc67-ef63-4c6d-8d26-73ea0537876e" xlink:to="loc_us-gaap_DeferredFederalIncomeTaxExpenseBenefit_59532b42-cbbc-47d7-b7c6-3ecdb73b1344" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit_f7d2ac27-f95c-48ef-a6c6-2d5e88512636" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_d2f8dc67-ef63-4c6d-8d26-73ea0537876e" xlink:to="loc_us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit_f7d2ac27-f95c-48ef-a6c6-2d5e88512636" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrentFederalTaxExpenseBenefit_a8b5bc4e-8013-4af8-a5a6-36e663ac74ca" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_d2f8dc67-ef63-4c6d-8d26-73ea0537876e" xlink:to="loc_us-gaap_CurrentFederalTaxExpenseBenefit_a8b5bc4e-8013-4af8-a5a6-36e663ac74ca" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrentForeignTaxExpenseBenefit_6e0b4a9a-d2bc-42f5-a5bb-1440022d438d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_d2f8dc67-ef63-4c6d-8d26-73ea0537876e" xlink:to="loc_us-gaap_CurrentForeignTaxExpenseBenefit_6e0b4a9a-d2bc-42f5-a5bb-1440022d438d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredForeignIncomeTaxExpenseBenefit_3d8fc087-0196-4f03-9b2c-88b8244dfea3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_d2f8dc67-ef63-4c6d-8d26-73ea0537876e" xlink:to="loc_us-gaap_DeferredForeignIncomeTaxExpenseBenefit_3d8fc087-0196-4f03-9b2c-88b8244dfea3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrentStateAndLocalTaxExpenseBenefit_1ba1eebd-776e-4471-a107-d15e8d157f88" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_d2f8dc67-ef63-4c6d-8d26-73ea0537876e" xlink:to="loc_us-gaap_CurrentStateAndLocalTaxExpenseBenefit_1ba1eebd-776e-4471-a107-d15e8d157f88" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/IncomeTaxesReconciliationofProvisionforIncomeTaxesDetails" xlink:type="simple" xlink:href="ldos-20250103.xsd#IncomeTaxesReconciliationofProvisionforIncomeTaxesDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/IncomeTaxesReconciliationofProvisionforIncomeTaxesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_ee9c6917-669a-4636-938d-d1d5c515cf6a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate_71b5530f-ad0c-420f-b852-6bd00b76af55" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_ee9c6917-669a-4636-938d-d1d5c515cf6a" xlink:to="loc_us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate_71b5530f-ad0c-420f-b852-6bd00b76af55" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes_9305040a-848e-4a78-ad32-71c53606710d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_ee9c6917-669a-4636-938d-d1d5c515cf6a" xlink:to="loc_us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes_9305040a-848e-4a78-ad32-71c53606710d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitAmount_80a2adb8-975a-4c19-8a12-1bce10331054" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_ee9c6917-669a-4636-938d-d1d5c515cf6a" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitAmount_80a2adb8-975a-4c19-8a12-1bce10331054" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationTaxCreditsResearch_d3ef95da-5f6b-42e9-9fb7-d9473aee9281" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_ee9c6917-669a-4636-938d-d1d5c515cf6a" xlink:to="loc_us-gaap_IncomeTaxReconciliationTaxCreditsResearch_d3ef95da-5f6b-42e9-9fb7-d9473aee9281" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance_149da88a-0e55-4354-a48a-f6fe68891886" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_ee9c6917-669a-4636-938d-d1d5c515cf6a" xlink:to="loc_us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance_149da88a-0e55-4354-a48a-f6fe68891886" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationTaxContingencies_106f8fc5-4b70-412e-b6d2-a15f73a63e46" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeTaxReconciliationTaxContingencies"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_ee9c6917-669a-4636-938d-d1d5c515cf6a" xlink:to="loc_us-gaap_IncomeTaxReconciliationTaxContingencies_106f8fc5-4b70-412e-b6d2-a15f73a63e46" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends_a10b1246-9152-41fd-8015-6bd4fad5ecd1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends"/>
    <link:calculationArc order="7" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_ee9c6917-669a-4636-938d-d1d5c515cf6a" xlink:to="loc_us-gaap_IncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends_a10b1246-9152-41fd-8015-6bd4fad5ecd1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_EffectiveIncomeTaxRateReconciliationImpactOfForeignOperations_506b82d9-e821-44a0-8093-3b9f28816563" xlink:href="ldos-20250103.xsd#ldos_EffectiveIncomeTaxRateReconciliationImpactOfForeignOperations"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_ee9c6917-669a-4636-938d-d1d5c515cf6a" xlink:to="loc_ldos_EffectiveIncomeTaxRateReconciliationImpactOfForeignOperations_506b82d9-e821-44a0-8093-3b9f28816563" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationOtherAdjustments_34289cab-57b5-4104-bd24-00f35e782669" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeTaxReconciliationOtherAdjustments"/>
    <link:calculationArc order="9" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_ee9c6917-669a-4636-938d-d1d5c515cf6a" xlink:to="loc_us-gaap_IncomeTaxReconciliationOtherAdjustments_34289cab-57b5-4104-bd24-00f35e782669" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_EffectiveIncomeTaxRateReconciliationImpactOfGoodwill_74dd9740-edc6-43e4-8452-e92e958a6fdc" xlink:href="ldos-20250103.xsd#ldos_EffectiveIncomeTaxRateReconciliationImpactOfGoodwill"/>
    <link:calculationArc order="10" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_ee9c6917-669a-4636-938d-d1d5c515cf6a" xlink:to="loc_ldos_EffectiveIncomeTaxRateReconciliationImpactOfGoodwill_74dd9740-edc6-43e4-8452-e92e958a6fdc" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/IncomeTaxesDeferredTaxAssetsLiabilitiesDetails" xlink:type="simple" xlink:href="ldos-20250103.xsd#IncomeTaxesDeferredTaxAssetsLiabilitiesDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/IncomeTaxesDeferredTaxAssetsLiabilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsGross_f2e43a6f-0799-49bf-9cb7-f88859a11856" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DeferredTaxAssetsGross"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost_8c96ae63-96ad-4a5f-a213-102e053aff26" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_f2e43a6f-0799-49bf-9cb7-f88859a11856" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost_8c96ae63-96ad-4a5f-a213-102e053aff26" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves_666c28d3-0d16-44b9-bbec-46adbeeb08d0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_f2e43a6f-0799-49bf-9cb7-f88859a11856" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves_666c28d3-0d16-44b9-bbec-46adbeeb08d0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsOtherComprehensiveLoss_a7c3460b-10a8-44ea-afa1-b6c66bb1a052" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DeferredTaxAssetsOtherComprehensiveLoss"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_f2e43a6f-0799-49bf-9cb7-f88859a11856" xlink:to="loc_us-gaap_DeferredTaxAssetsOtherComprehensiveLoss_a7c3460b-10a8-44ea-afa1-b6c66bb1a052" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_DeferredTaxAssetsOperatingLeaseLiabilities_cd0d12e0-bd6b-4b9a-86db-b19147266a83" xlink:href="ldos-20250103.xsd#ldos_DeferredTaxAssetsOperatingLeaseLiabilities"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_f2e43a6f-0799-49bf-9cb7-f88859a11856" xlink:to="loc_ldos_DeferredTaxAssetsOperatingLeaseLiabilities_cd0d12e0-bd6b-4b9a-86db-b19147266a83" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsCompensatedAbsences_1483deb0-3907-4973-8b1a-04fb0901c1b3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsCompensatedAbsences"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_f2e43a6f-0799-49bf-9cb7-f88859a11856" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsCompensatedAbsences_1483deb0-3907-4973-8b1a-04fb0901c1b3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation_9c7a3ad7-9cad-4c90-bd1f-0f92214882c7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_f2e43a6f-0799-49bf-9cb7-f88859a11856" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation_9c7a3ad7-9cad-4c90-bd1f-0f92214882c7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_DeferredTaxAssetsTaxCreditAndNetOperatingLossCarryforwards_b4a6dd04-68ce-4021-bf27-d22a9e67af49" xlink:href="ldos-20250103.xsd#ldos_DeferredTaxAssetsTaxCreditAndNetOperatingLossCarryforwards"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_f2e43a6f-0799-49bf-9cb7-f88859a11856" xlink:to="loc_ldos_DeferredTaxAssetsTaxCreditAndNetOperatingLossCarryforwards_b4a6dd04-68ce-4021-bf27-d22a9e67af49" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsOther_3ab7ce0a-13e3-42a2-80c5-42639e3a2635" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DeferredTaxAssetsOther"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_f2e43a6f-0799-49bf-9cb7-f88859a11856" xlink:to="loc_us-gaap_DeferredTaxAssetsOther_3ab7ce0a-13e3-42a2-80c5-42639e3a2635" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_DeferredTaxAssetsCapitalizedResearchAndDevelopment_b2d30770-1d30-4112-9eec-98bd02439f89" xlink:href="ldos-20250103.xsd#ldos_DeferredTaxAssetsCapitalizedResearchAndDevelopment"/>
    <link:calculationArc order="9" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_f2e43a6f-0799-49bf-9cb7-f88859a11856" xlink:to="loc_ldos_DeferredTaxAssetsCapitalizedResearchAndDevelopment_b2d30770-1d30-4112-9eec-98bd02439f89" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsDeferredIncome_cf92e8a0-c2b2-4c60-b972-913439106d17" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DeferredTaxAssetsDeferredIncome"/>
    <link:calculationArc order="10" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_f2e43a6f-0799-49bf-9cb7-f88859a11856" xlink:to="loc_us-gaap_DeferredTaxAssetsDeferredIncome_cf92e8a0-c2b2-4c60-b972-913439106d17" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsNet_e531e5ad-c5f8-481e-97d1-6a985f91eb8b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DeferredTaxAssetsNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsGross_4a3957be-297c-4876-8dfe-eade81111a97" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_e531e5ad-c5f8-481e-97d1-6a985f91eb8b" xlink:to="loc_us-gaap_DeferredTaxAssetsGross_4a3957be-297c-4876-8dfe-eade81111a97" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsValuationAllowance_12ab123b-7243-4c2c-a04a-af91db227eec" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_e531e5ad-c5f8-481e-97d1-6a985f91eb8b" xlink:to="loc_us-gaap_DeferredTaxAssetsValuationAllowance_12ab123b-7243-4c2c-a04a-af91db227eec" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsLiabilitiesNet_1784c4cd-cfc1-4011-a14a-44bf39c272f2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DeferredTaxAssetsLiabilitiesNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsNet_42ac221f-edfb-43f4-9fc0-1c138a109e32" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DeferredTaxAssetsNet"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsLiabilitiesNet_1784c4cd-cfc1-4011-a14a-44bf39c272f2" xlink:to="loc_us-gaap_DeferredTaxAssetsNet_42ac221f-edfb-43f4-9fc0-1c138a109e32" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilities_93fd6c08-65b9-447c-8272-2a1230b6ebf1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DeferredIncomeTaxLiabilities"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsLiabilitiesNet_1784c4cd-cfc1-4011-a14a-44bf39c272f2" xlink:to="loc_us-gaap_DeferredIncomeTaxLiabilities_93fd6c08-65b9-447c-8272-2a1230b6ebf1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilities_9dfb6cf7-4b84-4ecb-85a9-32126d860c4e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DeferredIncomeTaxLiabilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment_ed06f939-f641-4bd4-9d5d-a64ea92cd908" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_9dfb6cf7-4b84-4ecb-85a9-32126d860c4e" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment_ed06f939-f641-4bd4-9d5d-a64ea92cd908" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesTaxDeferredIncome_3f0ebf94-c44d-4b4b-b2be-aef3134bcd60" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_9dfb6cf7-4b84-4ecb-85a9-32126d860c4e" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesTaxDeferredIncome_3f0ebf94-c44d-4b4b-b2be-aef3134bcd60" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesLeasingArrangements_1f0a78c7-46d9-45fb-b51b-aa7cb36af2a0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_9dfb6cf7-4b84-4ecb-85a9-32126d860c4e" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesLeasingArrangements_1f0a78c7-46d9-45fb-b51b-aa7cb36af2a0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets_598f071c-0348-4efa-83fd-737868a7a9ee" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_9dfb6cf7-4b84-4ecb-85a9-32126d860c4e" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets_598f071c-0348-4efa-83fd-737868a7a9ee" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesOther_fe192498-ab1a-4aac-90cf-861865a1dbce" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_9dfb6cf7-4b84-4ecb-85a9-32126d860c4e" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesOther_fe192498-ab1a-4aac-90cf-861865a1dbce" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/RetirementPlansDetails" xlink:type="simple" xlink:href="ldos-20250103.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_f41996f6-d98d-4752-9d69-1a3cb33329ac" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanFundedStatusOfPlan"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanBenefitObligation_f99a0d1d-496c-48e8-885a-2c65600760c2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_f41996f6-d98d-4752-9d69-1a3cb33329ac" xlink:to="loc_us-gaap_DefinedBenefitPlanBenefitObligation_f99a0d1d-496c-48e8-885a-2c65600760c2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_756c66de-ff1a-451c-ae92-c5ba9a3aa45f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_f41996f6-d98d-4752-9d69-1a3cb33329ac" xlink:to="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_756c66de-ff1a-451c-ae92-c5ba9a3aa45f" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/CommitmentsandContingenciesFutureExpirationsMaturityTableDetails" xlink:type="simple" xlink:href="ldos-20250103.xsd#CommitmentsandContingenciesFutureExpirationsMaturityTableDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/CommitmentsandContingenciesFutureExpirationsMaturityTableDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitment_665c6589-fd03-4012-a148-ed220c74939a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherCommitment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentDueInSecondYear_6f508390-1589-45b8-b471-e85a547ead06" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherCommitmentDueInSecondYear"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherCommitment_665c6589-fd03-4012-a148-ed220c74939a" xlink:to="loc_us-gaap_OtherCommitmentDueInSecondYear_6f508390-1589-45b8-b471-e85a547ead06" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentDueAfterFifthYear_1cabe07f-a115-4fe4-872a-8b1ea7e2d861" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherCommitmentDueAfterFifthYear"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherCommitment_665c6589-fd03-4012-a148-ed220c74939a" xlink:to="loc_us-gaap_OtherCommitmentDueAfterFifthYear_1cabe07f-a115-4fe4-872a-8b1ea7e2d861" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentDueInFifthYear_6dc1e65e-0fd6-4c64-924b-71966b2e6c60" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherCommitmentDueInFifthYear"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherCommitment_665c6589-fd03-4012-a148-ed220c74939a" xlink:to="loc_us-gaap_OtherCommitmentDueInFifthYear_6dc1e65e-0fd6-4c64-924b-71966b2e6c60" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentDueInFourthYear_a6f673bf-9107-49ae-a541-d445eca19844" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherCommitmentDueInFourthYear"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherCommitment_665c6589-fd03-4012-a148-ed220c74939a" xlink:to="loc_us-gaap_OtherCommitmentDueInFourthYear_a6f673bf-9107-49ae-a541-d445eca19844" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentDueInThirdYear_d8ac8e34-5830-4a3e-8cfd-0a5d1defaa74" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherCommitmentDueInThirdYear"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherCommitment_665c6589-fd03-4012-a148-ed220c74939a" xlink:to="loc_us-gaap_OtherCommitmentDueInThirdYear_d8ac8e34-5830-4a3e-8cfd-0a5d1defaa74" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentDueInNextTwelveMonths_4dee6ddb-105b-44ff-a28e-4dfa47af40d8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherCommitmentDueInNextTwelveMonths"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherCommitment_665c6589-fd03-4012-a148-ed220c74939a" xlink:to="loc_us-gaap_OtherCommitmentDueInNextTwelveMonths_4dee6ddb-105b-44ff-a28e-4dfa47af40d8" xlink:type="arc"/>
  </link:calculationLink>
</link:linkbase>
