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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2025 Workiva-->
<!--r:287d34a3-07d8-40ab-89a4-56619b0d1935,g:50cf7c91-a251-48cf-94ac-21d073e83710-->
<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/CONDENSEDCONSOLIDATEDBALANCESHEETS" xlink:type="simple" xlink:href="ldos-20250704.xsd#CONDENSEDCONSOLIDATEDBALANCESHEETS"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_5d9426bd-4fb1-4205-8a97-d8a54ef096c5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Assets"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_71cdeb3e-5ffd-4840-8e96-b4b12605656d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_5d9426bd-4fb1-4205-8a97-d8a54ef096c5" xlink:to="loc_us-gaap_AssetsCurrent_71cdeb3e-5ffd-4840-8e96-b4b12605656d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_4d7aba1c-7bcb-4e5c-92f9-94d731f4973a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.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_5d9426bd-4fb1-4205-8a97-d8a54ef096c5" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_4d7aba1c-7bcb-4e5c-92f9-94d731f4973a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_f2734701-a76a-4971-a6af-36db8957d35d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherAssetsNoncurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_5d9426bd-4fb1-4205-8a97-d8a54ef096c5" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_f2734701-a76a-4971-a6af-36db8957d35d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_82d0e0f1-f8d4-44e3-b800-58c4a44ce14b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Goodwill"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_5d9426bd-4fb1-4205-8a97-d8a54ef096c5" xlink:to="loc_us-gaap_Goodwill_82d0e0f1-f8d4-44e3-b800-58c4a44ce14b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_6f6192d7-9064-48d6-94a3-c8ef3a29f745" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_5d9426bd-4fb1-4205-8a97-d8a54ef096c5" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_6f6192d7-9064-48d6-94a3-c8ef3a29f745" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_0b0a6fee-cdc6-4c5f-bc00-9dae433d8216" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_5d9426bd-4fb1-4205-8a97-d8a54ef096c5" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_0b0a6fee-cdc6-4c5f-bc00-9dae433d8216" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_a90f53d4-68bc-40a9-bb4e-bdf0fbf3bb43" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Liabilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_6fb6c894-851e-4de4-86b0-1c5456cfcb81" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligations"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_a90f53d4-68bc-40a9-bb4e-bdf0fbf3bb43" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_6fb6c894-851e-4de4-86b0-1c5456cfcb81" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_d663b32f-32e8-4edb-b700-28a295d4e3a1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_a90f53d4-68bc-40a9-bb4e-bdf0fbf3bb43" xlink:to="loc_us-gaap_LiabilitiesCurrent_d663b32f-32e8-4edb-b700-28a295d4e3a1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_143d500d-c5d4-43c3-b299-0289065eb43f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.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_a90f53d4-68bc-40a9-bb4e-bdf0fbf3bb43" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_143d500d-c5d4-43c3-b299-0289065eb43f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_22ccc6d4-f5c1-433f-8c0b-bd853162462d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherLiabilitiesNoncurrent"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_a90f53d4-68bc-40a9-bb4e-bdf0fbf3bb43" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_22ccc6d4-f5c1-433f-8c0b-bd853162462d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_c1275ac4-3f8a-48ae-86e5-058f4293461f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValue_fbf42601-5b14-42e2-b322-88bfa9c7419b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockValue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_c1275ac4-3f8a-48ae-86e5-058f4293461f" xlink:to="loc_us-gaap_CommonStockValue_fbf42601-5b14-42e2-b322-88bfa9c7419b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapital_87a02efa-0df9-4d48-ac11-2bfb39086fc2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdditionalPaidInCapital"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_c1275ac4-3f8a-48ae-86e5-058f4293461f" xlink:to="loc_us-gaap_AdditionalPaidInCapital_87a02efa-0df9-4d48-ac11-2bfb39086fc2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_11eef950-3ecc-4f1b-bacb-441ebbdf7467" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_c1275ac4-3f8a-48ae-86e5-058f4293461f" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_11eef950-3ecc-4f1b-bacb-441ebbdf7467" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_6c5e6d21-1dec-4841-bf75-7db8c6a4a230" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_c1275ac4-3f8a-48ae-86e5-058f4293461f" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_6c5e6d21-1dec-4841-bf75-7db8c6a4a230" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_05f59a10-635d-4678-a963-4134eb1cf798" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_2860efe7-3044-48d4-8ce1-9c105741166d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.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_05f59a10-635d-4678-a963-4134eb1cf798" xlink:to="loc_us-gaap_StockholdersEquity_2860efe7-3044-48d4-8ce1-9c105741166d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterest_cad70357-bba5-4cec-a571-52d54d43d0af" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.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_05f59a10-635d-4678-a963-4134eb1cf798" xlink:to="loc_us-gaap_MinorityInterest_cad70357-bba5-4cec-a571-52d54d43d0af" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_db6308e1-efc7-4551-ac5a-d6c702ca04d0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_fc108fb2-3a69-40c9-8019-b9c894ee31f5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.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_AssetsCurrent_db6308e1-efc7-4551-ac5a-d6c702ca04d0" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_fc108fb2-3a69-40c9-8019-b9c894ee31f5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivablesNetCurrent_b2e0707e-a259-4927-a95f-31bca711265c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReceivablesNetCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_db6308e1-efc7-4551-ac5a-d6c702ca04d0" xlink:to="loc_us-gaap_ReceivablesNetCurrent_b2e0707e-a259-4927-a95f-31bca711265c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryNet_814acc39-9110-4ea9-819c-593188436cf9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InventoryNet"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_db6308e1-efc7-4551-ac5a-d6c702ca04d0" xlink:to="loc_us-gaap_InventoryNet_814acc39-9110-4ea9-819c-593188436cf9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsCurrent_ad6978e5-4153-488f-bdaf-3b0d540526c6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherAssetsCurrent"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_db6308e1-efc7-4551-ac5a-d6c702ca04d0" xlink:to="loc_us-gaap_OtherAssetsCurrent_ad6978e5-4153-488f-bdaf-3b0d540526c6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_066d7230-ee59-4746-9c4e-a66278c3dde1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_dd447691-32df-4e19-bad6-00ae4f65e1a8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeRelatedLiabilitiesCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_066d7230-ee59-4746-9c4e-a66278c3dde1" xlink:to="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_dd447691-32df-4e19-bad6-00ae4f65e1a8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtCurrent_1d9426ba-3039-40bf-a8b0-2c29a5f4474b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_066d7230-ee59-4746-9c4e-a66278c3dde1" xlink:to="loc_us-gaap_DebtCurrent_1d9426ba-3039-40bf-a8b0-2c29a5f4474b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_fd504a9e-4216-43b8-a316-93c8c002162d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_066d7230-ee59-4746-9c4e-a66278c3dde1" xlink:to="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_fd504a9e-4216-43b8-a316-93c8c002162d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_e152cd22-2fd5-416d-93e1-0f184ebc8bef" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_5708adb7-8730-4eb9-9eab-34edf8a44974" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_e152cd22-2fd5-416d-93e1-0f184ebc8bef" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_5708adb7-8730-4eb9-9eab-34edf8a44974" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingencies_732b4d07-1c19-41dc-9c1c-0b1ac8068058" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.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_e152cd22-2fd5-416d-93e1-0f184ebc8bef" xlink:to="loc_us-gaap_CommitmentsAndContingencies_732b4d07-1c19-41dc-9c1c-0b1ac8068058" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_e15a46b9-b8f8-4a60-96f3-c4ff84a29e9f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Liabilities"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_e152cd22-2fd5-416d-93e1-0f184ebc8bef" xlink:to="loc_us-gaap_Liabilities_e15a46b9-b8f8-4a60-96f3-c4ff84a29e9f" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFOPERATIONS" xlink:type="simple" xlink:href="ldos-20250704.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFOPERATIONS"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFOPERATIONS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_69eb3c93-7d09-4595-8a42-8d8b9c68bb5a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_c8cf1176-1d67-4db0-b1b4-954fda99ecec" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProfitLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_69eb3c93-7d09-4595-8a42-8d8b9c68bb5a" xlink:to="loc_us-gaap_ProfitLoss_c8cf1176-1d67-4db0-b1b4-954fda99ecec" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_eff3e9ed-c76f-415b-9e19-f2b06bcb4081" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_69eb3c93-7d09-4595-8a42-8d8b9c68bb5a" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_eff3e9ed-c76f-415b-9e19-f2b06bcb4081" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_666aa3c7-d505-4c5f-993b-c984dcfb2809" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProfitLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_fdb2e4ac-bdfd-42a8-b326-3d4f71977ec1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.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_666aa3c7-d505-4c5f-993b-c984dcfb2809" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_fdb2e4ac-bdfd-42a8-b326-3d4f71977ec1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_420b087b-aaff-4fd1-8921-e509a34653c4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.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_666aa3c7-d505-4c5f-993b-c984dcfb2809" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_420b087b-aaff-4fd1-8921-e509a34653c4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_a965ac30-9e4f-46e7-81e7-73ef9f1b49f9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfRevenue_a992d3a2-e91e-4358-9c25-feaebaea39d4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostOfRevenue"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_a965ac30-9e4f-46e7-81e7-73ef9f1b49f9" xlink:to="loc_us-gaap_CostOfRevenue_a992d3a2-e91e-4358-9c25-feaebaea39d4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromEquityMethodInvestments_19cda8ab-af69-43a8-9535-a9185bf8a5a1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromEquityMethodInvestments"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_a965ac30-9e4f-46e7-81e7-73ef9f1b49f9" xlink:to="loc_us-gaap_IncomeLossFromEquityMethodInvestments_19cda8ab-af69-43a8-9535-a9185bf8a5a1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_12524e40-cba7-455d-bdd0-9e64dad3ec0b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.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_a965ac30-9e4f-46e7-81e7-73ef9f1b49f9" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_12524e40-cba7-455d-bdd0-9e64dad3ec0b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_AcquisitionIntegrationAndRestructuringCosts_941af635-93f2-4d8c-a720-9739b2f7fa6e" xlink:href="ldos-20250704.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_a965ac30-9e4f-46e7-81e7-73ef9f1b49f9" xlink:to="loc_ldos_AcquisitionIntegrationAndRestructuringCosts_941af635-93f2-4d8c-a720-9739b2f7fa6e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_5bf8ad0f-ff1e-4d4f-a6f1-e41d930858b5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Revenues"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_a965ac30-9e4f-46e7-81e7-73ef9f1b49f9" xlink:to="loc_us-gaap_Revenues_5bf8ad0f-ff1e-4d4f-a6f1-e41d930858b5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_df901d14-df75-4786-a4ec-eab1d62f5214" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_82972636-864d-4090-9df2-57878acaabca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.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_df901d14-df75-4786-a4ec-eab1d62f5214" xlink:to="loc_us-gaap_OperatingIncomeLoss_82972636-864d-4090-9df2-57878acaabca" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeExpenseNonoperatingNet_42fa1a98-65fd-4b75-bc52-2d56f75b26d9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestIncomeExpenseNonoperatingNet"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_df901d14-df75-4786-a4ec-eab1d62f5214" xlink:to="loc_us-gaap_InterestIncomeExpenseNonoperatingNet_42fa1a98-65fd-4b75-bc52-2d56f75b26d9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_b5d12f50-4280-4e16-b217-d251248d5c95" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_df901d14-df75-4786-a4ec-eab1d62f5214" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_b5d12f50-4280-4e16-b217-d251248d5c95" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME" xlink:type="simple" xlink:href="ldos-20250704.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_d39892c6-093e-440c-95ff-82d8185959b4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ComprehensiveIncomeNetOfTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_42773ef5-b935-4f92-9723-d4e8f86b9b0f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_d39892c6-093e-440c-95ff-82d8185959b4" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_42773ef5-b935-4f92-9723-d4e8f86b9b0f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_8b067946-91a9-4057-8cb0-e8a2d442d957" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_d39892c6-093e-440c-95ff-82d8185959b4" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_8b067946-91a9-4057-8cb0-e8a2d442d957" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_38df019b-0d76-40f3-86fc-3ed4c93991b5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax_cc9c8a2e-199b-41a6-9983-c1c4a39272d4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_38df019b-0d76-40f3-86fc-3ed4c93991b5" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax_cc9c8a2e-199b-41a6-9983-c1c4a39272d4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_9a98b648-55ce-4277-8186-07b52e72ee92" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_38df019b-0d76-40f3-86fc-3ed4c93991b5" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_9a98b648-55ce-4277-8186-07b52e72ee92" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax_16a040f2-b120-4a6b-ab84-b9557b7f0764" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_38df019b-0d76-40f3-86fc-3ed4c93991b5" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax_16a040f2-b120-4a6b-ab84-b9557b7f0764" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_9897cbd2-ec67-4741-9e63-4ec3fefe8621" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_898d69c2-ec3e-4298-b69d-3cc72a6b0c55" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProfitLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_9897cbd2-ec67-4741-9e63-4ec3fefe8621" xlink:to="loc_us-gaap_ProfitLoss_898d69c2-ec3e-4298-b69d-3cc72a6b0c55" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_cb2285c7-9be4-41b1-9766-f0542a2456f3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_9897cbd2-ec67-4741-9e63-4ec3fefe8621" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_cb2285c7-9be4-41b1-9766-f0542a2456f3" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" xlink:type="simple" xlink:href="ldos-20250704.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_1d0730d4-eac9-45f0-a007-442f5ed4382e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_54371b6a-0cc2-414a-87f5-0da852bcc368" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_1d0730d4-eac9-45f0-a007-442f5ed4382e" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_54371b6a-0cc2-414a-87f5-0da852bcc368" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_e9e75e54-b16c-40fb-881d-409a723db1c2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.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_1d0730d4-eac9-45f0-a007-442f5ed4382e" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_e9e75e54-b16c-40fb-881d-409a723db1c2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_995ce3d9-61f2-4685-bda8-4a6371018935" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_1d0730d4-eac9-45f0-a007-442f5ed4382e" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_995ce3d9-61f2-4685-bda8-4a6371018935" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_9350d3d3-d46b-44dd-abca-39c3a2004115" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.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_1d0730d4-eac9-45f0-a007-442f5ed4382e" xlink:to="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_9350d3d3-d46b-44dd-abca-39c3a2004115" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_8e395d48-32d1-4a2d-b5a6-e8f3660236c8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCash_5117ca41-57b2-4144-96b6-5c14003e5fa1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedCash"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_8e395d48-32d1-4a2d-b5a6-e8f3660236c8" xlink:to="loc_us-gaap_RestrictedCash_5117ca41-57b2-4144-96b6-5c14003e5fa1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_f28ad19e-7697-4536-b481-c288f04c4ff3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_8e395d48-32d1-4a2d-b5a6-e8f3660236c8" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_f28ad19e-7697-4536-b481-c288f04c4ff3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_b80fc6be-a155-4fb6-a80e-de9df93ea986" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfEquity_3da3696c-1934-48e0-9e2e-1de0117ef21a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsForRepurchaseOfEquity"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_b80fc6be-a155-4fb6-a80e-de9df93ea986" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfEquity_3da3696c-1934-48e0-9e2e-1de0117ef21a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfLongTermDebtAndCapitalSecurities_b6658c36-a4d4-48c6-be99-652d8e9fd13e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.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_b80fc6be-a155-4fb6-a80e-de9df93ea986" xlink:to="loc_us-gaap_RepaymentsOfLongTermDebtAndCapitalSecurities_b6658c36-a4d4-48c6-be99-652d8e9fd13e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfOrdinaryDividends_8cea26cb-d261-4493-868f-2dd39032db1f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsOfOrdinaryDividends"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_b80fc6be-a155-4fb6-a80e-de9df93ea986" xlink:to="loc_us-gaap_PaymentsOfOrdinaryDividends_8cea26cb-d261-4493-868f-2dd39032db1f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromPaymentsToMinorityShareholders_6a24ea3f-20a1-4857-8386-38f3f6d66a92" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromPaymentsToMinorityShareholders"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_b80fc6be-a155-4fb6-a80e-de9df93ea986" xlink:to="loc_us-gaap_ProceedsFromPaymentsToMinorityShareholders_6a24ea3f-20a1-4857-8386-38f3f6d66a92" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfDebt_62eaba81-28d8-4e56-a432-59cb727cdc1d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromIssuanceOfDebt"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_b80fc6be-a155-4fb6-a80e-de9df93ea986" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfDebt_62eaba81-28d8-4e56-a432-59cb727cdc1d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDebtIssuanceCosts_15a32228-8e9a-4ab8-aadd-07822eac7203" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsOfDebtIssuanceCosts"/>
    <link:calculationArc order="6" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_b80fc6be-a155-4fb6-a80e-de9df93ea986" xlink:to="loc_us-gaap_PaymentsOfDebtIssuanceCosts_15a32228-8e9a-4ab8-aadd-07822eac7203" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOrSaleOfEquity_c9333099-b7da-4079-a512-fba0d391e1d5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromIssuanceOrSaleOfEquity"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_b80fc6be-a155-4fb6-a80e-de9df93ea986" xlink:to="loc_us-gaap_ProceedsFromIssuanceOrSaleOfEquity_c9333099-b7da-4079-a512-fba0d391e1d5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_50e7a75e-6b0b-4426-a135-e52378a52737" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.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_b80fc6be-a155-4fb6-a80e-de9df93ea986" xlink:to="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_50e7a75e-6b0b-4426-a135-e52378a52737" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_547ef10e-fcc8-4fbb-aa48-c7e7fd1eb0d0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_fafb6e57-bc08-467d-b1f8-c3cb9c2059ee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_547ef10e-fcc8-4fbb-aa48-c7e7fd1eb0d0" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_fafb6e57-bc08-467d-b1f8-c3cb9c2059ee" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireProductiveAssets_a958d20d-2548-4932-8cc7-b7b450fb10b9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToAcquireProductiveAssets"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_547ef10e-fcc8-4fbb-aa48-c7e7fd1eb0d0" xlink:to="loc_us-gaap_PaymentsToAcquireProductiveAssets_a958d20d-2548-4932-8cc7-b7b450fb10b9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfProductiveAssets_c18545d1-027a-41f1-83ff-01e771a7ffbe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromSaleOfProductiveAssets"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_547ef10e-fcc8-4fbb-aa48-c7e7fd1eb0d0" xlink:to="loc_us-gaap_ProceedsFromSaleOfProductiveAssets_c18545d1-027a-41f1-83ff-01e771a7ffbe" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_d751c49e-e5b5-4442-8ff5-b7b6350af497" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsForProceedsFromOtherInvestingActivities"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_547ef10e-fcc8-4fbb-aa48-c7e7fd1eb0d0" xlink:to="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_d751c49e-e5b5-4442-8ff5-b7b6350af497" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_49ea2421-6cbf-4f68-a279-34efd6199423" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_306daaf3-f088-4428-9d14-84d91929eb99" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DepreciationDepletionAndAmortization"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_49ea2421-6cbf-4f68-a279-34efd6199423" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_306daaf3-f088-4428-9d14-84d91929eb99" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities_58ed7662-75f9-4327-91eb-c4323931cd17" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_49ea2421-6cbf-4f68-a279-34efd6199423" xlink:to="loc_us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities_58ed7662-75f9-4327-91eb-c4323931cd17" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_434f0510-ec25-4678-83eb-a6afd1ea424c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProfitLoss"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_49ea2421-6cbf-4f68-a279-34efd6199423" xlink:to="loc_us-gaap_ProfitLoss_434f0510-ec25-4678-83eb-a6afd1ea424c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_a4ccd781-965e-4308-b1b4-1602475c2161" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensation"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_49ea2421-6cbf-4f68-a279-34efd6199423" xlink:to="loc_us-gaap_ShareBasedCompensation_a4ccd781-965e-4308-b1b4-1602475c2161" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_39b32e48-9c19-4293-b21f-427d0df39b16" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_49ea2421-6cbf-4f68-a279-34efd6199423" xlink:to="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_39b32e48-9c19-4293-b21f-427d0df39b16" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_4f5bc25d-c36a-4950-98de-7ca72d9d3015" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInOtherOperatingAssets"/>
    <link:calculationArc order="6" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_49ea2421-6cbf-4f68-a279-34efd6199423" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_4f5bc25d-c36a-4950-98de-7ca72d9d3015" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInReceivables_e896a1d2-4c7e-4a42-b821-94b4dce90b8a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInReceivables"/>
    <link:calculationArc order="7" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_49ea2421-6cbf-4f68-a279-34efd6199423" xlink:to="loc_us-gaap_IncreaseDecreaseInReceivables_e896a1d2-4c7e-4a42-b821-94b4dce90b8a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncashIncomeExpense_85d76e40-f503-45b0-85fd-2f73fab7c4d9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherNoncashIncomeExpense"/>
    <link:calculationArc order="8" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_49ea2421-6cbf-4f68-a279-34efd6199423" xlink:to="loc_us-gaap_OtherNoncashIncomeExpense_85d76e40-f503-45b0-85fd-2f73fab7c4d9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_IncreaseDecreaseInAccountsPayableAndAccruedLiabilitiesAndOtherNoncurrentLiabilities_e7672a8a-bb90-4847-bda2-fffa3e152a9e" xlink:href="ldos-20250704.xsd#ldos_IncreaseDecreaseInAccountsPayableAndAccruedLiabilitiesAndOtherNoncurrentLiabilities"/>
    <link:calculationArc order="9" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_49ea2421-6cbf-4f68-a279-34efd6199423" xlink:to="loc_ldos_IncreaseDecreaseInAccountsPayableAndAccruedLiabilitiesAndOtherNoncurrentLiabilities_e7672a8a-bb90-4847-bda2-fffa3e152a9e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInIncomeTaxes_2fb0b65a-119e-4ffe-9d0d-9f8c89d33544" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInIncomeTaxes"/>
    <link:calculationArc order="10" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_49ea2421-6cbf-4f68-a279-34efd6199423" xlink:to="loc_us-gaap_IncreaseDecreaseInIncomeTaxes_2fb0b65a-119e-4ffe-9d0d-9f8c89d33544" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/BasisofPresentationandSummaryofSignificantAccountingPoliciesChangesinEstimatesonContractsDetails" xlink:type="simple" xlink:href="ldos-20250704.xsd#BasisofPresentationandSummaryofSignificantAccountingPoliciesChangesinEstimatesonContractsDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/BasisofPresentationandSummaryofSignificantAccountingPoliciesChangesinEstimatesonContractsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ldos_IncreaseDecreaseInIncomeFromChangeInContractEstimates_bd81799b-735b-40cc-95ee-b75e60cbe8b7" xlink:href="ldos-20250704.xsd#ldos_IncreaseDecreaseInIncomeFromChangeInContractEstimates"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_DecreaseInIncomeBeforeIncomeTaxesFromChangesInContractEstimates_7403a7fa-dbb0-4ef7-b6b0-2ed7b8a82705" xlink:href="ldos-20250704.xsd#ldos_DecreaseInIncomeBeforeIncomeTaxesFromChangesInContractEstimates"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ldos_IncreaseDecreaseInIncomeFromChangeInContractEstimates_bd81799b-735b-40cc-95ee-b75e60cbe8b7" xlink:to="loc_ldos_DecreaseInIncomeBeforeIncomeTaxesFromChangesInContractEstimates_7403a7fa-dbb0-4ef7-b6b0-2ed7b8a82705" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_IncreaseInIncomeBeforeIncomeTaxesFromChangesInContractEstimates_de47db0b-fbd9-4337-b1a9-0a827f5d7e0d" xlink:href="ldos-20250704.xsd#ldos_IncreaseInIncomeBeforeIncomeTaxesFromChangesInContractEstimates"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ldos_IncreaseDecreaseInIncomeFromChangeInContractEstimates_bd81799b-735b-40cc-95ee-b75e60cbe8b7" xlink:to="loc_ldos_IncreaseInIncomeBeforeIncomeTaxesFromChangesInContractEstimates_de47db0b-fbd9-4337-b1a9-0a827f5d7e0d" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/AcquisitionsGoodwillandIntangibleAssetsIntangibleAssetsDetails" xlink:type="simple" xlink:href="ldos-20250704.xsd#AcquisitionsGoodwillandIntangibleAssetsIntangibleAssetsDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/AcquisitionsGoodwillandIntangibleAssetsIntangibleAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_a573832f-6763-4a04-843f-d1c85cd1a572" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_7203d01a-fbdf-4ad6-8342-993e3f62cb8a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.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_a573832f-6763-4a04-843f-d1c85cd1a572" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_7203d01a-fbdf-4ad6-8342-993e3f62cb8a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_e86201c1-a154-41bb-804d-96169a67fed6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.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_a573832f-6763-4a04-843f-d1c85cd1a572" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_e86201c1-a154-41bb-804d-96169a67fed6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_3eeb6e9a-5914-499f-b26a-c564c531ec19" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IntangibleAssetsGrossExcludingGoodwill"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_f91bd66a-547a-4eba-ae92-b8d085b6a174" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.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_3eeb6e9a-5914-499f-b26a-c564c531ec19" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_f91bd66a-547a-4eba-ae92-b8d085b6a174" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_19a5802c-bb07-4f18-9d0a-4a64d33b5c24" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.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_3eeb6e9a-5914-499f-b26a-c564c531ec19" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_19a5802c-bb07-4f18-9d0a-4a64d33b5c24" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_e4a8a292-73ba-4124-8c1d-99b8afb604c6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_7a9c940e-3a7d-4cf7-b6eb-55212b6391f2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.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_e4a8a292-73ba-4124-8c1d-99b8afb604c6" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_7a9c940e-3a7d-4cf7-b6eb-55212b6391f2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_a6523c72-6e84-4465-816e-a95ae9684f7e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.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_e4a8a292-73ba-4124-8c1d-99b8afb604c6" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_a6523c72-6e84-4465-816e-a95ae9684f7e" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/AcquisitionsGoodwillandIntangibleAssetsIntangibleAssetsDetails_1" xlink:type="simple" xlink:href="ldos-20250704.xsd#AcquisitionsGoodwillandIntangibleAssetsIntangibleAssetsDetails_1"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/AcquisitionsGoodwillandIntangibleAssetsIntangibleAssetsDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_90eeb2f3-d5e4-4e4d-af4f-02faac26f111" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_ca9be9a0-d60a-4f45-90c5-703a7f18db97" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.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_90eeb2f3-d5e4-4e4d-af4f-02faac26f111" xlink:to="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_ca9be9a0-d60a-4f45-90c5-703a7f18db97" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_8ed74daa-791d-495f-b284-17a34bb38ad0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.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_90eeb2f3-d5e4-4e4d-af4f-02faac26f111" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_8ed74daa-791d-495f-b284-17a34bb38ad0" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/AcquisitionsGoodwillandIntangibleAssetsEstimatedAnnualAmortizationExpenseDetails" xlink:type="simple" xlink:href="ldos-20250704.xsd#AcquisitionsGoodwillandIntangibleAssetsEstimatedAnnualAmortizationExpenseDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/AcquisitionsGoodwillandIntangibleAssetsEstimatedAnnualAmortizationExpenseDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_bb0744aa-6a64-4d64-bb88-bdd824fc2e48" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear_354be772-698d-4f0a-85c9-203c1975e8a8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_bb0744aa-6a64-4d64-bb88-bdd824fc2e48" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear_354be772-698d-4f0a-85c9-203c1975e8a8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_644cee8e-e6a9-456a-be13-54f62b28d0a8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_bb0744aa-6a64-4d64-bb88-bdd824fc2e48" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_644cee8e-e6a9-456a-be13-54f62b28d0a8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_8a2f73b4-edfc-4b1b-b861-3b48a82379db" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_bb0744aa-6a64-4d64-bb88-bdd824fc2e48" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_8a2f73b4-edfc-4b1b-b861-3b48a82379db" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_b207b3cf-6e9f-4fdf-87a0-62a59391c1b4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_bb0744aa-6a64-4d64-bb88-bdd824fc2e48" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_b207b3cf-6e9f-4fdf-87a0-62a59391c1b4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_e80e9bd2-c771-4fd2-8428-31a086f3c2c1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.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_bb0744aa-6a64-4d64-bb88-bdd824fc2e48" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_e80e9bd2-c771-4fd2-8428-31a086f3c2c1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_FiniteLivedIntangibleAssetExpectedAmortizationDueAfterYearFour_1773c3f8-82c0-4d70-8984-7a73e1af7c47" xlink:href="ldos-20250704.xsd#ldos_FiniteLivedIntangibleAssetExpectedAmortizationDueAfterYearFour"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_bb0744aa-6a64-4d64-bb88-bdd824fc2e48" xlink:to="loc_ldos_FiniteLivedIntangibleAssetExpectedAmortizationDueAfterYearFour_1773c3f8-82c0-4d70-8984-7a73e1af7c47" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/DebtScheduleofCompanysDebtDetails" xlink:type="simple" xlink:href="ldos-20250704.xsd#DebtScheduleofCompanysDebtDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/DebtScheduleofCompanysDebtDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities_a22c534e-df6e-4a52-bc75-f30cc3468811" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnsecuredDebt_2ccc241b-1e48-4c33-973d-57e7bd9cdc7d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.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_a22c534e-df6e-4a52-bc75-f30cc3468811" xlink:to="loc_us-gaap_UnsecuredDebt_2ccc241b-1e48-4c33-973d-57e7bd9cdc7d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_ba7cc9c2-c492-4b66-a1ca-ab62c1299835" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.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_a22c534e-df6e-4a52-bc75-f30cc3468811" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_ba7cc9c2-c492-4b66-a1ca-ab62c1299835" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/DebtScheduleofCompanysDebtDetails_1" xlink:type="simple" xlink:href="ldos-20250704.xsd#DebtScheduleofCompanysDebtDetails_1"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/DebtScheduleofCompanysDebtDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities_5e0c028f-3dfb-49b2-922e-76e49957d9fe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent_1036697f-48b8-45fe-a882-82d95037935d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.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_5e0c028f-3dfb-49b2-922e-76e49957d9fe" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent_1036697f-48b8-45fe-a882-82d95037935d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_3921d50e-dc80-4175-a081-eec4c76db850" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.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_5e0c028f-3dfb-49b2-922e-76e49957d9fe" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_3921d50e-dc80-4175-a081-eec4c76db850" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/EarningsPerShareReconciliationofWeightedAverageNumberofSharesOutstandingDetails" xlink:type="simple" xlink:href="ldos-20250704.xsd#EarningsPerShareReconciliationofWeightedAverageNumberofSharesOutstandingDetails"/>
  <link:calculationLink xlink:role="http://www.leidos.com/role/EarningsPerShareReconciliationofWeightedAverageNumberofSharesOutstandingDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_8611ca09-e48c-432f-9619-dbb7229c4243" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_2fca88cb-fa06-4af1-9be0-cda75048de6a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.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_8611ca09-e48c-432f-9619-dbb7229c4243" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_2fca88cb-fa06-4af1-9be0-cda75048de6a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_acbb7a0a-0050-4d3c-b998-ed245f8b3095" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.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_8611ca09-e48c-432f-9619-dbb7229c4243" xlink:to="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_acbb7a0a-0050-4d3c-b998-ed245f8b3095" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.leidos.com/role/CommitmentsandContingenciesFutureExpirationsMaturityTableDetails" xlink:type="simple" xlink:href="ldos-20250704.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_70fe0de3-2367-463d-857f-fde27b22195f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCommitment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsFutureMinimumPaymentsRemainderOfFiscalYear_a2e0a2d5-d012-45af-8ccf-1535b6675ffc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCommitmentsFutureMinimumPaymentsRemainderOfFiscalYear"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherCommitment_70fe0de3-2367-463d-857f-fde27b22195f" xlink:to="loc_us-gaap_OtherCommitmentsFutureMinimumPaymentsRemainderOfFiscalYear_a2e0a2d5-d012-45af-8ccf-1535b6675ffc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentDueInThirdYear_ea9b7f34-fb10-47d9-8cad-b843f9cf8c3c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCommitmentDueInThirdYear"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherCommitment_70fe0de3-2367-463d-857f-fde27b22195f" xlink:to="loc_us-gaap_OtherCommitmentDueInThirdYear_ea9b7f34-fb10-47d9-8cad-b843f9cf8c3c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentDueInSecondYear_6d89fa28-a9f4-491b-91bf-4c75e4671650" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCommitmentDueInSecondYear"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherCommitment_70fe0de3-2367-463d-857f-fde27b22195f" xlink:to="loc_us-gaap_OtherCommitmentDueInSecondYear_6d89fa28-a9f4-491b-91bf-4c75e4671650" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ldos_OtherCommitmentToBePaidAfterYearFour_05d2d1ac-066d-4b24-862f-8ea72ed38dbd" xlink:href="ldos-20250704.xsd#ldos_OtherCommitmentToBePaidAfterYearFour"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherCommitment_70fe0de3-2367-463d-857f-fde27b22195f" xlink:to="loc_ldos_OtherCommitmentToBePaidAfterYearFour_05d2d1ac-066d-4b24-862f-8ea72ed38dbd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentDueInFourthYear_cf587acb-9fa4-4585-961f-b0ac5e4a30bc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCommitmentDueInFourthYear"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherCommitment_70fe0de3-2367-463d-857f-fde27b22195f" xlink:to="loc_us-gaap_OtherCommitmentDueInFourthYear_cf587acb-9fa4-4585-961f-b0ac5e4a30bc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentDueInNextTwelveMonths_7865bf7e-0a42-4c40-8a39-4eb680f847b5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.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_70fe0de3-2367-463d-857f-fde27b22195f" xlink:to="loc_us-gaap_OtherCommitmentDueInNextTwelveMonths_7865bf7e-0a42-4c40-8a39-4eb680f847b5" xlink:type="arc"/>
  </link:calculationLink>
</link:linkbase>
