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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2025 Workiva-->
<!--r:e0d3f318-d9b0-489a-9b5a-1e8de5742357,g:658a098b-5cb1-45b3-be7f-1f96c3017223-->
<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:arcroleRef arcroleURI="https://xbrl.org/2023/arcrole/summation-item" xlink:type="simple" xlink:href="https://www.xbrl.org/2023/calculation-1.1.xsd#summation-item"/>
  <link:roleRef roleURI="http://centrica.com/role/StatementofcomprehensiveincomeprofitorlossbynatureofexpenseStatement" xlink:type="simple" xlink:href="E26EDV109X6EEPBKVH76-2024-12-31.xsd#StatementofcomprehensiveincomeprofitorlossbynatureofexpenseStatement"/>
  <link:calculationLink xlink:role="http://centrica.com/role/StatementofcomprehensiveincomeprofitorlossbynatureofexpenseStatement" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentLiabilities_336da2f4-58ec-4eee-9300-76dc61300fb9" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CurrentLiabilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentTaxLiabilities_a7f43fb4-70f6-4372-85f9-d4b103a0a90f" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CurrentTaxLiabilities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_CurrentLiabilities_336da2f4-58ec-4eee-9300-76dc61300fb9" xlink:to="loc_ifrs-full_CurrentTaxLiabilities_a7f43fb4-70f6-4372-85f9-d4b103a0a90f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TradeAndOtherCurrentPayables_5995c4ab-fb46-4287-a3d6-4edf2a09f18b" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_TradeAndOtherCurrentPayables"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_CurrentLiabilities_336da2f4-58ec-4eee-9300-76dc61300fb9" xlink:to="loc_ifrs-full_TradeAndOtherCurrentPayables_5995c4ab-fb46-4287-a3d6-4edf2a09f18b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings_aa306b23-99e3-4e22-96ae-7ff7c0c10b12" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_CurrentLiabilities_336da2f4-58ec-4eee-9300-76dc61300fb9" xlink:to="loc_ifrs-full_CurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings_aa306b23-99e3-4e22-96ae-7ff7c0c10b12" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentDerivativeFinancialLiabilities_ea15fa70-75c0-45ff-a39a-fcc8513666cd" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CurrentDerivativeFinancialLiabilities"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_CurrentLiabilities_336da2f4-58ec-4eee-9300-76dc61300fb9" xlink:to="loc_ifrs-full_CurrentDerivativeFinancialLiabilities_ea15fa70-75c0-45ff-a39a-fcc8513666cd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InsuranceContractsThatAreLiabilities_ddc76729-bdfe-4fb6-bafe-459cfc6c3295" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_InsuranceContractsThatAreLiabilities"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_CurrentLiabilities_336da2f4-58ec-4eee-9300-76dc61300fb9" xlink:to="loc_ifrs-full_InsuranceContractsThatAreLiabilities_ddc76729-bdfe-4fb6-bafe-459cfc6c3295" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentProvisions_5d4b4219-6a41-43c2-b09d-700d14f1a22a" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CurrentProvisions"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_CurrentLiabilities_336da2f4-58ec-4eee-9300-76dc61300fb9" xlink:to="loc_ifrs-full_CurrentProvisions_5d4b4219-6a41-43c2-b09d-700d14f1a22a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInInvestingActivities_789bdff3-7209-4f6e-82de-da18d2945d83" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashFlowsFromUsedInInvestingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherCashPaymentsToAcquireEquityOrDebtInstrumentsOfOtherEntitiesClassifiedAsInvestingActivities_cecd2a70-1eca-4dac-8de7-3df8f7bfb985" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherCashPaymentsToAcquireEquityOrDebtInstrumentsOfOtherEntitiesClassifiedAsInvestingActivities"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_CashFlowsFromUsedInInvestingActivities_789bdff3-7209-4f6e-82de-da18d2945d83" xlink:to="loc_ifrs-full_OtherCashPaymentsToAcquireEquityOrDebtInstrumentsOfOtherEntitiesClassifiedAsInvestingActivities_cecd2a70-1eca-4dac-8de7-3df8f7bfb985" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherCashReceiptsFromSalesOfEquityOrDebtInstrumentsOfOtherEntitiesClassifiedAsInvestingActivities_40222164-9af9-436c-9c5f-20c60a431d8f" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherCashReceiptsFromSalesOfEquityOrDebtInstrumentsOfOtherEntitiesClassifiedAsInvestingActivities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_CashFlowsFromUsedInInvestingActivities_789bdff3-7209-4f6e-82de-da18d2945d83" xlink:to="loc_ifrs-full_OtherCashReceiptsFromSalesOfEquityOrDebtInstrumentsOfOtherEntitiesClassifiedAsInvestingActivities_40222164-9af9-436c-9c5f-20c60a431d8f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsUsedInObtainingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities_2171550a-ec6b-481f-9d5e-e6471b62e85d" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashFlowsUsedInObtainingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_CashFlowsFromUsedInInvestingActivities_789bdff3-7209-4f6e-82de-da18d2945d83" xlink:to="loc_ifrs-full_CashFlowsUsedInObtainingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities_2171550a-ec6b-481f-9d5e-e6471b62e85d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromLosingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities_5ba8bd78-de30-4a6d-a02a-5305893d593d" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashFlowsFromLosingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_CashFlowsFromUsedInInvestingActivities_789bdff3-7209-4f6e-82de-da18d2945d83" xlink:to="loc_ifrs-full_CashFlowsFromLosingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities_5ba8bd78-de30-4a6d-a02a-5305893d593d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PurchaseOfInterestsInInvestmentsAccountedForUsingEquityMethod_b593cb64-b27d-44c2-a591-8c68fcd9af31" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_PurchaseOfInterestsInInvestmentsAccountedForUsingEquityMethod"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_CashFlowsFromUsedInInvestingActivities_789bdff3-7209-4f6e-82de-da18d2945d83" xlink:to="loc_ifrs-full_PurchaseOfInterestsInInvestmentsAccountedForUsingEquityMethod_b593cb64-b27d-44c2-a591-8c68fcd9af31" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_e528986c-ee08-4957-8ada-237413e4334d" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities"/>
    <link:calculationArc order="6" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_CashFlowsFromUsedInInvestingActivities_789bdff3-7209-4f6e-82de-da18d2945d83" xlink:to="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_e528986c-ee08-4957-8ada-237413e4334d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_cna_InvestmentsInJointVenturesAndAssociatesClassifiedAsInvestingActivities_9c3287df-f437-45b5-930f-0ea422f4f97e" xlink:href="E26EDV109X6EEPBKVH76-2024-12-31.xsd#cna_InvestmentsInJointVenturesAndAssociatesClassifiedAsInvestingActivities"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_CashFlowsFromUsedInInvestingActivities_789bdff3-7209-4f6e-82de-da18d2945d83" xlink:to="loc_cna_InvestmentsInJointVenturesAndAssociatesClassifiedAsInvestingActivities_9c3287df-f437-45b5-930f-0ea422f4f97e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DividendsReceivedFromAssociatesClassifiedAsInvestingActivities_89b8ad62-9034-4df3-9bb6-d679cf529881" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DividendsReceivedFromAssociatesClassifiedAsInvestingActivities"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_CashFlowsFromUsedInInvestingActivities_789bdff3-7209-4f6e-82de-da18d2945d83" xlink:to="loc_ifrs-full_DividendsReceivedFromAssociatesClassifiedAsInvestingActivities_89b8ad62-9034-4df3-9bb6-d679cf529881" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InterestReceivedClassifiedAsInvestingActivities_37044eae-16d7-4bc5-bb6b-a7a7b64f122c" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_InterestReceivedClassifiedAsInvestingActivities"/>
    <link:calculationArc order="9" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_CashFlowsFromUsedInInvestingActivities_789bdff3-7209-4f6e-82de-da18d2945d83" xlink:to="loc_ifrs-full_InterestReceivedClassifiedAsInvestingActivities_37044eae-16d7-4bc5-bb6b-a7a7b64f122c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EquityAttributableToOwnersOfParent_889f7488-5825-481d-b9ec-838bc4ada300" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_EquityAttributableToOwnersOfParent"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SharePremium_abc09e0a-1bc1-438d-8c73-a8a87ff19b55" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_SharePremium"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_EquityAttributableToOwnersOfParent_889f7488-5825-481d-b9ec-838bc4ada300" xlink:to="loc_ifrs-full_SharePremium_abc09e0a-1bc1-438d-8c73-a8a87ff19b55" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherReserves_49aa6870-8ac9-4622-90c0-bc34e12fc34f" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherReserves"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_EquityAttributableToOwnersOfParent_889f7488-5825-481d-b9ec-838bc4ada300" xlink:to="loc_ifrs-full_OtherReserves_49aa6870-8ac9-4622-90c0-bc34e12fc34f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IssuedCapital_d0eca62a-fbde-4acc-a0aa-936bc2e578fc" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IssuedCapital"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_EquityAttributableToOwnersOfParent_889f7488-5825-481d-b9ec-838bc4ada300" xlink:to="loc_ifrs-full_IssuedCapital_d0eca62a-fbde-4acc-a0aa-936bc2e578fc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RetainedEarnings_b78ef82c-9cb2-4275-b5b9-d7d5330e000c" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_RetainedEarnings"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_EquityAttributableToOwnersOfParent_889f7488-5825-481d-b9ec-838bc4ada300" xlink:to="loc_ifrs-full_RetainedEarnings_b78ef82c-9cb2-4275-b5b9-d7d5330e000c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Revenue_89c19b6d-30c2-496d-a8e9-1e8d0d9ea7c1" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_Revenue"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InsuranceRevenue_1090e221-2b66-48a1-8b4c-2a4296430a42" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_InsuranceRevenue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_Revenue_89c19b6d-30c2-496d-a8e9-1e8d0d9ea7c1" xlink:to="loc_ifrs-full_InsuranceRevenue_1090e221-2b66-48a1-8b4c-2a4296430a42" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_cna_GroupRevenue_83e516fd-b356-42ee-87f8-570f8d33268b" xlink:href="E26EDV109X6EEPBKVH76-2024-12-31.xsd#cna_GroupRevenue"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_Revenue_89c19b6d-30c2-496d-a8e9-1e8d0d9ea7c1" xlink:to="loc_cna_GroupRevenue_83e516fd-b356-42ee-87f8-570f8d33268b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentAssets_48d2840b-e08e-4164-9588-ed21ebe8ccbf" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CurrentAssets"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TradeAndOtherCurrentReceivables_13930de0-4a41-46fc-b539-c93ec3fd19c3" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_TradeAndOtherCurrentReceivables"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_CurrentAssets_48d2840b-e08e-4164-9588-ed21ebe8ccbf" xlink:to="loc_ifrs-full_TradeAndOtherCurrentReceivables_13930de0-4a41-46fc-b539-c93ec3fd19c3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_cna_CurrentSecurities_10494611-c5fc-4907-b9f6-f95179a0002e" xlink:href="E26EDV109X6EEPBKVH76-2024-12-31.xsd#cna_CurrentSecurities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_CurrentAssets_48d2840b-e08e-4164-9588-ed21ebe8ccbf" xlink:to="loc_cna_CurrentSecurities_10494611-c5fc-4907-b9f6-f95179a0002e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentDerivativeFinancialAssets_e81954df-55dd-4a31-b136-5c3d67e9d9ed" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CurrentDerivativeFinancialAssets"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_CurrentAssets_48d2840b-e08e-4164-9588-ed21ebe8ccbf" xlink:to="loc_ifrs-full_CurrentDerivativeFinancialAssets_e81954df-55dd-4a31-b136-5c3d67e9d9ed" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Inventories_6fd2b12a-99a3-429a-8c6e-19a741ecfd11" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_Inventories"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_CurrentAssets_48d2840b-e08e-4164-9588-ed21ebe8ccbf" xlink:to="loc_ifrs-full_Inventories_6fd2b12a-99a3-429a-8c6e-19a741ecfd11" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentTaxAssets_b7b5014c-c724-4e42-8564-8a9662332b1d" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CurrentTaxAssets"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_CurrentAssets_48d2840b-e08e-4164-9588-ed21ebe8ccbf" xlink:to="loc_ifrs-full_CurrentTaxAssets_b7b5014c-c724-4e42-8564-8a9662332b1d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_cna_OtherIntangibleAssetsCurrentAssets_565605cf-b355-4cef-85d7-268b189366cd" xlink:href="E26EDV109X6EEPBKVH76-2024-12-31.xsd#cna_OtherIntangibleAssetsCurrentAssets"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_CurrentAssets_48d2840b-e08e-4164-9588-ed21ebe8ccbf" xlink:to="loc_cna_OtherIntangibleAssetsCurrentAssets_565605cf-b355-4cef-85d7-268b189366cd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashAndCashEquivalents_bacbe230-249e-4677-a5e6-1a41faa63af0" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashAndCashEquivalents"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_CurrentAssets_48d2840b-e08e-4164-9588-ed21ebe8ccbf" xlink:to="loc_ifrs-full_CashAndCashEquivalents_bacbe230-249e-4677-a5e6-1a41faa63af0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NetAssetsLiabilities_50838235-13ab-422a-b91e-f0ed944a0904" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_NetAssetsLiabilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Liabilities_4fac1a79-c1be-49ae-93cb-c7f5308861db" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_Liabilities"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_NetAssetsLiabilities_50838235-13ab-422a-b91e-f0ed944a0904" xlink:to="loc_ifrs-full_Liabilities_4fac1a79-c1be-49ae-93cb-c7f5308861db" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Assets_cbcbddde-2c42-44f0-876c-3c28953147cb" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_Assets"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_NetAssetsLiabilities_50838235-13ab-422a-b91e-f0ed944a0904" xlink:to="loc_ifrs-full_Assets_cbcbddde-2c42-44f0-876c-3c28953147cb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges_f9054c1b-99a6-44be-a4e7-512eb7622213" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInOperatingActivities_35b86882-6b92-423a-81a2-3f1adac722dc" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashFlowsFromUsedInOperatingActivities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges_f9054c1b-99a6-44be-a4e7-512eb7622213" xlink:to="loc_ifrs-full_CashFlowsFromUsedInOperatingActivities_35b86882-6b92-423a-81a2-3f1adac722dc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInInvestingActivities_ca17a886-2f2e-4138-ab7c-14d8db82fb73" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashFlowsFromUsedInInvestingActivities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges_f9054c1b-99a6-44be-a4e7-512eb7622213" xlink:to="loc_ifrs-full_CashFlowsFromUsedInInvestingActivities_ca17a886-2f2e-4138-ab7c-14d8db82fb73" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInFinancingActivities_6cb8849e-83d1-4a3a-992a-04ea0b397032" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashFlowsFromUsedInFinancingActivities"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges_f9054c1b-99a6-44be-a4e7-512eb7622213" xlink:to="loc_ifrs-full_CashFlowsFromUsedInFinancingActivities_6cb8849e-83d1-4a3a-992a-04ea0b397032" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentLiabilities_23a69c86-76c9-45a2-9c42-d992e1ec9dc0" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_NoncurrentLiabilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentDerivativeFinancialLiabilities_9b59cfb2-e294-4513-a02a-cc49cf1bdd19" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_NoncurrentDerivativeFinancialLiabilities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_NoncurrentLiabilities_23a69c86-76c9-45a2-9c42-d992e1ec9dc0" xlink:to="loc_ifrs-full_NoncurrentDerivativeFinancialLiabilities_9b59cfb2-e294-4513-a02a-cc49cf1bdd19" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentPayables_7b8754d1-d342-4250-8f08-90c364cabd4c" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_NoncurrentPayables"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_NoncurrentLiabilities_23a69c86-76c9-45a2-9c42-d992e1ec9dc0" xlink:to="loc_ifrs-full_NoncurrentPayables_7b8754d1-d342-4250-8f08-90c364cabd4c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentProvisions_2aafec8d-52fd-49e5-aef8-14b15c247fba" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_NoncurrentProvisions"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_NoncurrentLiabilities_23a69c86-76c9-45a2-9c42-d992e1ec9dc0" xlink:to="loc_ifrs-full_NoncurrentProvisions_2aafec8d-52fd-49e5-aef8-14b15c247fba" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LongtermBorrowings_02e200ec-8fdc-4cc6-b9cb-a0f55ed091c2" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_LongtermBorrowings"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_NoncurrentLiabilities_23a69c86-76c9-45a2-9c42-d992e1ec9dc0" xlink:to="loc_ifrs-full_LongtermBorrowings_02e200ec-8fdc-4cc6-b9cb-a0f55ed091c2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentRecognisedLiabilitiesDefinedBenefitPlan_19486758-2f9f-43c1-b06d-ab2cc09c514e" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_NoncurrentRecognisedLiabilitiesDefinedBenefitPlan"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_NoncurrentLiabilities_23a69c86-76c9-45a2-9c42-d992e1ec9dc0" xlink:to="loc_ifrs-full_NoncurrentRecognisedLiabilitiesDefinedBenefitPlan_19486758-2f9f-43c1-b06d-ab2cc09c514e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DeferredTaxLiabilities_c201e625-49f8-426a-b935-7647d24d722a" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DeferredTaxLiabilities"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_NoncurrentLiabilities_23a69c86-76c9-45a2-9c42-d992e1ec9dc0" xlink:to="loc_ifrs-full_DeferredTaxLiabilities_c201e625-49f8-426a-b935-7647d24d722a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInOperatingActivities_fb05acb3-93b6-446e-a21b-d2717f3369b3" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashFlowsFromUsedInOperatingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_cna_OperatingCashFlowsBeforePaymentsRelatingToTaxesExceptionalChargesAndOperatingInterest_7146f9f3-b661-4920-bb3d-792ba4e9f36c" xlink:href="E26EDV109X6EEPBKVH76-2024-12-31.xsd#cna_OperatingCashFlowsBeforePaymentsRelatingToTaxesExceptionalChargesAndOperatingInterest"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_CashFlowsFromUsedInOperatingActivities_fb05acb3-93b6-446e-a21b-d2717f3369b3" xlink:to="loc_cna_OperatingCashFlowsBeforePaymentsRelatingToTaxesExceptionalChargesAndOperatingInterest_7146f9f3-b661-4920-bb3d-792ba4e9f36c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InterestPaidClassifiedAsOperatingActivities_12ab45c4-256c-41a6-9535-4130e5937d7c" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_InterestPaidClassifiedAsOperatingActivities"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_CashFlowsFromUsedInOperatingActivities_fb05acb3-93b6-446e-a21b-d2717f3369b3" xlink:to="loc_ifrs-full_InterestPaidClassifiedAsOperatingActivities_12ab45c4-256c-41a6-9535-4130e5937d7c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncomeTaxesPaidRefundClassifiedAsOperatingActivities_9b2f0a9d-1acd-4d4b-9607-e82f4d4e5b1d" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IncomeTaxesPaidRefundClassifiedAsOperatingActivities"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_CashFlowsFromUsedInOperatingActivities_fb05acb3-93b6-446e-a21b-d2717f3369b3" xlink:to="loc_ifrs-full_IncomeTaxesPaidRefundClassifiedAsOperatingActivities_9b2f0a9d-1acd-4d4b-9607-e82f4d4e5b1d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_cna_PaymentsRelatingToExceptionalChargesInOperatingCosts_4e3559b4-316e-488e-8a28-5d7b485a8280" xlink:href="E26EDV109X6EEPBKVH76-2024-12-31.xsd#cna_PaymentsRelatingToExceptionalChargesInOperatingCosts"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_CashFlowsFromUsedInOperatingActivities_fb05acb3-93b6-446e-a21b-d2717f3369b3" xlink:to="loc_cna_PaymentsRelatingToExceptionalChargesInOperatingCosts_4e3559b4-316e-488e-8a28-5d7b485a8280" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GrossProfit_53cdef99-23a7-4580-bcec-153b6b5f422f" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_GrossProfit"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Revenue_ca4a1f85-2f7e-4c97-969c-064cbd5405ae" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_Revenue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_GrossProfit_53cdef99-23a7-4580-bcec-153b6b5f422f" xlink:to="loc_ifrs-full_Revenue_ca4a1f85-2f7e-4c97-969c-064cbd5405ae" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_cna_ReMeasurementAndSettlementOfDerivativeEnergyContracts_735ec71e-43b7-451d-aed7-e0e80bba2237" xlink:href="E26EDV109X6EEPBKVH76-2024-12-31.xsd#cna_ReMeasurementAndSettlementOfDerivativeEnergyContracts"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_GrossProfit_53cdef99-23a7-4580-bcec-153b6b5f422f" xlink:to="loc_cna_ReMeasurementAndSettlementOfDerivativeEnergyContracts_735ec71e-43b7-451d-aed7-e0e80bba2237" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CostOfSales_6e7e43d3-3ed8-4ddb-b9b0-a747aa8cb692" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CostOfSales"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_GrossProfit_53cdef99-23a7-4580-bcec-153b6b5f422f" xlink:to="loc_ifrs-full_CostOfSales_6e7e43d3-3ed8-4ddb-b9b0-a747aa8cb692" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_cna_InsuranceServicesCostOfSales_8dec6a75-0a1d-456c-a0e5-7df7ac91550f" xlink:href="E26EDV109X6EEPBKVH76-2024-12-31.xsd#cna_InsuranceServicesCostOfSales"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_GrossProfit_53cdef99-23a7-4580-bcec-153b6b5f422f" xlink:to="loc_cna_InsuranceServicesCostOfSales_8dec6a75-0a1d-456c-a0e5-7df7ac91550f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinanceIncomeCost_f980b7b6-2fba-4c82-b6b9-d7856a66ab46" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_FinanceIncomeCost"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinanceCosts_e7058335-f83e-4387-aaff-9324d44a0387" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_FinanceCosts"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_FinanceIncomeCost_f980b7b6-2fba-4c82-b6b9-d7856a66ab46" xlink:to="loc_ifrs-full_FinanceCosts_e7058335-f83e-4387-aaff-9324d44a0387" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InvestmentIncome_e36cc786-3f54-4a86-81c7-c1b671a5eef4" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_InvestmentIncome"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_FinanceIncomeCost_f980b7b6-2fba-4c82-b6b9-d7856a66ab46" xlink:to="loc_ifrs-full_InvestmentIncome_e36cc786-3f54-4a86-81c7-c1b671a5eef4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition_04179678-6f4d-4a26-951e-634140a6a11a" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EffectOfExchangeRateChangesOnCashAndCashEquivalents_a56d7bce-d318-4a0e-9647-636515db9fd1" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_EffectOfExchangeRateChangesOnCashAndCashEquivalents"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition_04179678-6f4d-4a26-951e-634140a6a11a" xlink:to="loc_ifrs-full_EffectOfExchangeRateChangesOnCashAndCashEquivalents_a56d7bce-d318-4a0e-9647-636515db9fd1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges_644c43c6-d876-4945-befd-f4b52115c4dc" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition_04179678-6f4d-4a26-951e-634140a6a11a" xlink:to="loc_ifrs-full_IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges_644c43c6-d876-4945-befd-f4b52115c4dc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OperatingExpense_1643e432-a85b-4073-9a4e-1a56c2f80288" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OperatingExpense"/>
    <link:loc xlink:type="locator" xlink:label="loc_cna_CreditLossesOnFinancialAssets_6fa97f17-b2dc-4aba-8aa3-b67014a11196" xlink:href="E26EDV109X6EEPBKVH76-2024-12-31.xsd#cna_CreditLossesOnFinancialAssets"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_OperatingExpense_1643e432-a85b-4073-9a4e-1a56c2f80288" xlink:to="loc_cna_CreditLossesOnFinancialAssets_6fa97f17-b2dc-4aba-8aa3-b67014a11196" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_cna_OperatingCostsBeforeInsuranceServicesOperatingCostsExceptionalItemsAndCreditLossesOnFinancialAssets_443007fb-bd9b-49f1-a84b-f701e7e7167d" xlink:href="E26EDV109X6EEPBKVH76-2024-12-31.xsd#cna_OperatingCostsBeforeInsuranceServicesOperatingCostsExceptionalItemsAndCreditLossesOnFinancialAssets"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_OperatingExpense_1643e432-a85b-4073-9a4e-1a56c2f80288" xlink:to="loc_cna_OperatingCostsBeforeInsuranceServicesOperatingCostsExceptionalItemsAndCreditLossesOnFinancialAssets_443007fb-bd9b-49f1-a84b-f701e7e7167d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_cna_ExceptionalItems_285a6e2d-f5f4-42b2-b025-88b8146402b8" xlink:href="E26EDV109X6EEPBKVH76-2024-12-31.xsd#cna_ExceptionalItems"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_OperatingExpense_1643e432-a85b-4073-9a4e-1a56c2f80288" xlink:to="loc_cna_ExceptionalItems_285a6e2d-f5f4-42b2-b025-88b8146402b8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_cna_InsuranceServicesOperatingCosts_ac17eff4-bddb-4116-87ae-62ba0933d286" xlink:href="E26EDV109X6EEPBKVH76-2024-12-31.xsd#cna_InsuranceServicesOperatingCosts"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_OperatingExpense_1643e432-a85b-4073-9a4e-1a56c2f80288" xlink:to="loc_cna_InsuranceServicesOperatingCosts_ac17eff4-bddb-4116-87ae-62ba0933d286" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Assets_abfdc15b-e6c6-4efb-97b3-e9918eaacf1e" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_Assets"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentAssets_c2d2fcfc-4c89-4db9-b205-4489b8c2f488" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CurrentAssets"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_Assets_abfdc15b-e6c6-4efb-97b3-e9918eaacf1e" xlink:to="loc_ifrs-full_CurrentAssets_c2d2fcfc-4c89-4db9-b205-4489b8c2f488" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentAssets_2804f107-95a6-4037-b359-d4febb234e79" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_NoncurrentAssets"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_Assets_abfdc15b-e6c6-4efb-97b3-e9918eaacf1e" xlink:to="loc_ifrs-full_NoncurrentAssets_2804f107-95a6-4037-b359-d4febb234e79" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Liabilities_234a4505-2a21-467f-b1f4-02bb4c723e5b" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_Liabilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentLiabilities_4527110c-79f4-4db3-9b24-e80e0d177a63" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_NoncurrentLiabilities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_Liabilities_234a4505-2a21-467f-b1f4-02bb4c723e5b" xlink:to="loc_ifrs-full_NoncurrentLiabilities_4527110c-79f4-4db3-9b24-e80e0d177a63" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentLiabilities_ef574b36-abd9-484b-b902-abe887c2ac02" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CurrentLiabilities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_Liabilities_234a4505-2a21-467f-b1f4-02bb4c723e5b" xlink:to="loc_ifrs-full_CurrentLiabilities_ef574b36-abd9-484b-b902-abe887c2ac02" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInFinancingActivities_f2c7acc3-c279-4196-8f48-b1fbea102f61" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashFlowsFromUsedInFinancingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities_4f93ae67-19ed-4e9b-81a0-02d40d85b936" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_CashFlowsFromUsedInFinancingActivities_f2c7acc3-c279-4196-8f48-b1fbea102f61" xlink:to="loc_ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities_4f93ae67-19ed-4e9b-81a0-02d40d85b936" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DividendsPaidToNoncontrollingInterestsClassifiedAsFinancingActivities_ab3a90ed-0896-441d-88b9-990828c86c63" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DividendsPaidToNoncontrollingInterestsClassifiedAsFinancingActivities"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_CashFlowsFromUsedInFinancingActivities_f2c7acc3-c279-4196-8f48-b1fbea102f61" xlink:to="loc_ifrs-full_DividendsPaidToNoncontrollingInterestsClassifiedAsFinancingActivities_ab3a90ed-0896-441d-88b9-990828c86c63" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_cna_ShareBuybackProgrammeClassifiedAsFinancingActivities_8ca48aed-b7c4-44cf-880d-f71dd7a7c796" xlink:href="E26EDV109X6EEPBKVH76-2024-12-31.xsd#cna_ShareBuybackProgrammeClassifiedAsFinancingActivities"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_CashFlowsFromUsedInFinancingActivities_f2c7acc3-c279-4196-8f48-b1fbea102f61" xlink:to="loc_cna_ShareBuybackProgrammeClassifiedAsFinancingActivities_8ca48aed-b7c4-44cf-880d-f71dd7a7c796" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PaymentsToAcquireOrRedeemEntitysShares_a8344468-7aa3-400f-80b0-c69f3b03c14f" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_PaymentsToAcquireOrRedeemEntitysShares"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_CashFlowsFromUsedInFinancingActivities_f2c7acc3-c279-4196-8f48-b1fbea102f61" xlink:to="loc_ifrs-full_PaymentsToAcquireOrRedeemEntitysShares_a8344468-7aa3-400f-80b0-c69f3b03c14f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DividendsPaidToEquityHoldersOfParentClassifiedAsFinancingActivities_afc4ee6f-b10f-4f53-9462-047068d4a7e6" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DividendsPaidToEquityHoldersOfParentClassifiedAsFinancingActivities"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_CashFlowsFromUsedInFinancingActivities_f2c7acc3-c279-4196-8f48-b1fbea102f61" xlink:to="loc_ifrs-full_DividendsPaidToEquityHoldersOfParentClassifiedAsFinancingActivities_afc4ee6f-b10f-4f53-9462-047068d4a7e6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities_3159e1ae-ae36-4662-a1d5-e20602f40e55" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_CashFlowsFromUsedInFinancingActivities_f2c7acc3-c279-4196-8f48-b1fbea102f61" xlink:to="loc_ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities_3159e1ae-ae36-4662-a1d5-e20602f40e55" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InterestPaidClassifiedAsFinancingActivities_9ace14b1-7aaa-4bb6-994b-0367a98f2fd9" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_InterestPaidClassifiedAsFinancingActivities"/>
    <link:calculationArc order="7" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_CashFlowsFromUsedInFinancingActivities_f2c7acc3-c279-4196-8f48-b1fbea102f61" xlink:to="loc_ifrs-full_InterestPaidClassifiedAsFinancingActivities_9ace14b1-7aaa-4bb6-994b-0367a98f2fd9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProceedsFromExerciseOfOptions_3d224404-31d4-4a78-b7d8-a7fef1a6372a" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ProceedsFromExerciseOfOptions"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_CashFlowsFromUsedInFinancingActivities_f2c7acc3-c279-4196-8f48-b1fbea102f61" xlink:to="loc_ifrs-full_ProceedsFromExerciseOfOptions_3d224404-31d4-4a78-b7d8-a7fef1a6372a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentAssets_238b53d9-ff7f-48e5-a935-13f2fa0c673b" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_NoncurrentAssets"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IntangibleAssetsOtherThanGoodwill_217efd62-6bc8-483a-80b2-2ec35a2fb7a9" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IntangibleAssetsOtherThanGoodwill"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_NoncurrentAssets_238b53d9-ff7f-48e5-a935-13f2fa0c673b" xlink:to="loc_ifrs-full_IntangibleAssetsOtherThanGoodwill_217efd62-6bc8-483a-80b2-2ec35a2fb7a9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InvestmentsInSubsidiariesJointVenturesAndAssociates_d8d0abfa-11be-43ea-9407-4a21e38432d7" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_InvestmentsInSubsidiariesJointVenturesAndAssociates"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_NoncurrentAssets_238b53d9-ff7f-48e5-a935-13f2fa0c673b" xlink:to="loc_ifrs-full_InvestmentsInSubsidiariesJointVenturesAndAssociates_d8d0abfa-11be-43ea-9407-4a21e38432d7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentRecognisedAssetsDefinedBenefitPlan_13a93dc1-7311-42bd-92f7-7e22bc1d3533" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_NoncurrentRecognisedAssetsDefinedBenefitPlan"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_NoncurrentAssets_238b53d9-ff7f-48e5-a935-13f2fa0c673b" xlink:to="loc_ifrs-full_NoncurrentRecognisedAssetsDefinedBenefitPlan_13a93dc1-7311-42bd-92f7-7e22bc1d3533" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_cna_NonCurrentSecurities_1f44b1ff-6fa4-472b-bac3-46db8ccbfeb2" xlink:href="E26EDV109X6EEPBKVH76-2024-12-31.xsd#cna_NonCurrentSecurities"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_NoncurrentAssets_238b53d9-ff7f-48e5-a935-13f2fa0c673b" xlink:to="loc_cna_NonCurrentSecurities_1f44b1ff-6fa4-472b-bac3-46db8ccbfeb2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentDerivativeFinancialAssets_cda52607-aee7-45d6-a9b4-2d9984e6bbb0" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_NoncurrentDerivativeFinancialAssets"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_NoncurrentAssets_238b53d9-ff7f-48e5-a935-13f2fa0c673b" xlink:to="loc_ifrs-full_NoncurrentDerivativeFinancialAssets_cda52607-aee7-45d6-a9b4-2d9984e6bbb0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PropertyPlantAndEquipment_2c9aed04-2ec3-468d-9189-bb01ef9ceacc" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_PropertyPlantAndEquipment"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_NoncurrentAssets_238b53d9-ff7f-48e5-a935-13f2fa0c673b" xlink:to="loc_ifrs-full_PropertyPlantAndEquipment_2c9aed04-2ec3-468d-9189-bb01ef9ceacc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Goodwill_995262e3-451a-420d-92ab-4bb19626c893" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_Goodwill"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_NoncurrentAssets_238b53d9-ff7f-48e5-a935-13f2fa0c673b" xlink:to="loc_ifrs-full_Goodwill_995262e3-451a-420d-92ab-4bb19626c893" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DeferredTaxAssets_daa392c7-53e0-4e42-ba92-4dd0d41998c6" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DeferredTaxAssets"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_NoncurrentAssets_238b53d9-ff7f-48e5-a935-13f2fa0c673b" xlink:to="loc_ifrs-full_DeferredTaxAssets_daa392c7-53e0-4e42-ba92-4dd0d41998c6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentReceivables_5dabe843-1315-47af-b388-76282ea0cca3" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_NoncurrentReceivables"/>
    <link:calculationArc order="9" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_NoncurrentAssets_238b53d9-ff7f-48e5-a935-13f2fa0c673b" xlink:to="loc_ifrs-full_NoncurrentReceivables_5dabe843-1315-47af-b388-76282ea0cca3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethod_0b19dd63-7b7e-47ed-a96e-628eadc5a3c0" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_NoncurrentInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethod"/>
    <link:calculationArc order="10" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_NoncurrentAssets_238b53d9-ff7f-48e5-a935-13f2fa0c673b" xlink:to="loc_ifrs-full_NoncurrentInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethod_0b19dd63-7b7e-47ed-a96e-628eadc5a3c0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProfitLoss_ecedeee1-f4d1-4060-bed1-58076b8caec7" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ProfitLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncomeTaxExpenseContinuingOperations_3e6a2f79-3882-4a88-8142-a26889a3e226" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IncomeTaxExpenseContinuingOperations"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_ProfitLoss_ecedeee1-f4d1-4060-bed1-58076b8caec7" xlink:to="loc_ifrs-full_IncomeTaxExpenseContinuingOperations_3e6a2f79-3882-4a88-8142-a26889a3e226" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProfitLossBeforeTax_8f8e99a0-5f04-4270-a5fe-f8aea8edb169" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ProfitLossBeforeTax"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_ProfitLoss_ecedeee1-f4d1-4060-bed1-58076b8caec7" xlink:to="loc_ifrs-full_ProfitLossBeforeTax_8f8e99a0-5f04-4270-a5fe-f8aea8edb169" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProfitLossBeforeTax_ffca0842-dc67-4c35-a19d-f0df89822985" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ProfitLossBeforeTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinanceIncomeCost_98d935ea-8f40-4615-80b7-8bf8dc7f0e1a" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_FinanceIncomeCost"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_ProfitLossBeforeTax_ffca0842-dc67-4c35-a19d-f0df89822985" xlink:to="loc_ifrs-full_FinanceIncomeCost_98d935ea-8f40-4615-80b7-8bf8dc7f0e1a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProfitLossFromOperatingActivities_2e98870f-bdbc-4cba-b637-88ec84408548" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ProfitLossFromOperatingActivities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_ProfitLossBeforeTax_ffca0842-dc67-4c35-a19d-f0df89822985" xlink:to="loc_ifrs-full_ProfitLossFromOperatingActivities_2e98870f-bdbc-4cba-b637-88ec84408548" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://centrica.com/role/StatementofcomprehensiveincomeprofitorlossbynatureofexpenseStatement_1" xlink:type="simple" xlink:href="E26EDV109X6EEPBKVH76-2024-12-31.xsd#StatementofcomprehensiveincomeprofitorlossbynatureofexpenseStatement_1"/>
  <link:calculationLink xlink:role="http://centrica.com/role/StatementofcomprehensiveincomeprofitorlossbynatureofexpenseStatement_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition_4b153821-e7fe-4d21-81fe-eb49fa21de18" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashAndCashEquivalents_3eeedba5-7e40-4894-b7cd-2c509aa6c9b0" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashAndCashEquivalents"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition_4b153821-e7fe-4d21-81fe-eb49fa21de18" xlink:to="loc_ifrs-full_CashAndCashEquivalents_3eeedba5-7e40-4894-b7cd-2c509aa6c9b0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BankOverdraftsClassifiedAsCashEquivalents_8a98a86a-8721-4f38-a5a8-f4ac3e5fb95f" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_BankOverdraftsClassifiedAsCashEquivalents"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition_4b153821-e7fe-4d21-81fe-eb49fa21de18" xlink:to="loc_ifrs-full_BankOverdraftsClassifiedAsCashEquivalents_8a98a86a-8721-4f38-a5a8-f4ac3e5fb95f" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://centrica.com/role/StatementofcomprehensiveincomeOCIcomponentspresentednetoftaxStatement" xlink:type="simple" xlink:href="E26EDV109X6EEPBKVH76-2024-12-31.xsd#StatementofcomprehensiveincomeOCIcomponentspresentednetoftaxStatement"/>
  <link:calculationLink xlink:role="http://centrica.com/role/StatementofcomprehensiveincomeOCIcomponentspresentednetoftaxStatement" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComprehensiveIncome_ec800b62-2c31-4f9f-8a71-7b2a2910db3a" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ComprehensiveIncome"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherComprehensiveIncome_63035cc7-9950-4429-af49-229c55a15492" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherComprehensiveIncome"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_ComprehensiveIncome_ec800b62-2c31-4f9f-8a71-7b2a2910db3a" xlink:to="loc_ifrs-full_OtherComprehensiveIncome_63035cc7-9950-4429-af49-229c55a15492" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProfitLoss_4c7902da-34dc-4a75-9f09-d4649cfc8bdc" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ProfitLoss"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_ComprehensiveIncome_ec800b62-2c31-4f9f-8a71-7b2a2910db3a" xlink:to="loc_ifrs-full_ProfitLoss_4c7902da-34dc-4a75-9f09-d4649cfc8bdc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherComprehensiveIncome_01341032-656e-40c8-8ca3-13b5da650617" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherComprehensiveIncome"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherComprehensiveIncomeNetOfTaxGainsLossesOnRevaluation_02b9cdd2-02f8-44bb-99d8-4f7880f8dc2e" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherComprehensiveIncomeNetOfTaxGainsLossesOnRevaluation"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_OtherComprehensiveIncome_01341032-656e-40c8-8ca3-13b5da650617" xlink:to="loc_ifrs-full_OtherComprehensiveIncomeNetOfTaxGainsLossesOnRevaluation_02b9cdd2-02f8-44bb-99d8-4f7880f8dc2e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ShareOfOtherComprehensiveIncomeOfAssociatesAndJointVenturesAccountedForUsingEquityMethodThatWillNotBeReclassifiedToProfitOrLossNetOfTax_5eeec763-9f40-484e-b431-79c0e05e9220" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ShareOfOtherComprehensiveIncomeOfAssociatesAndJointVenturesAccountedForUsingEquityMethodThatWillNotBeReclassifiedToProfitOrLossNetOfTax"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_OtherComprehensiveIncome_01341032-656e-40c8-8ca3-13b5da650617" xlink:to="loc_ifrs-full_ShareOfOtherComprehensiveIncomeOfAssociatesAndJointVenturesAccountedForUsingEquityMethodThatWillNotBeReclassifiedToProfitOrLossNetOfTax_5eeec763-9f40-484e-b431-79c0e05e9220" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans_87771b31-637b-4fda-b37a-ef361cc4359c" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_OtherComprehensiveIncome_01341032-656e-40c8-8ca3-13b5da650617" xlink:to="loc_ifrs-full_OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans_87771b31-637b-4fda-b37a-ef361cc4359c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherComprehensiveIncomeNetOfTaxCashFlowHedges_8c7d55b8-833a-4e70-bf91-02197358a475" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherComprehensiveIncomeNetOfTaxCashFlowHedges"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_OtherComprehensiveIncome_01341032-656e-40c8-8ca3-13b5da650617" xlink:to="loc_ifrs-full_OtherComprehensiveIncomeNetOfTaxCashFlowHedges_8c7d55b8-833a-4e70-bf91-02197358a475" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationNetOfTax_c681970a-10a3-4274-be79-09760d866319" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationNetOfTax"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_OtherComprehensiveIncome_01341032-656e-40c8-8ca3-13b5da650617" xlink:to="loc_ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationNetOfTax_c681970a-10a3-4274-be79-09760d866319" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://centrica.com/role/StatementofcashflowsindirectmethodStatement" xlink:type="simple" xlink:href="E26EDV109X6EEPBKVH76-2024-12-31.xsd#StatementofcashflowsindirectmethodStatement"/>
  <link:calculationLink xlink:role="http://centrica.com/role/StatementofcashflowsindirectmethodStatement" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital_f4789d2c-5e60-4703-a0c2-0589c853f394" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForSharebasedPayments_506fb638-6311-4f69-81f6-7f90d78ccf0c" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_AdjustmentsForSharebasedPayments"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital_f4789d2c-5e60-4703-a0c2-0589c853f394" xlink:to="loc_ifrs-full_AdjustmentsForSharebasedPayments_506fb638-6311-4f69-81f6-7f90d78ccf0c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_cna_AdjustmentsForGainlossOnDisposals_724944bb-ccd3-4be2-80b5-a5d16613f8ec" xlink:href="E26EDV109X6EEPBKVH76-2024-12-31.xsd#cna_AdjustmentsForGainlossOnDisposals"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital_f4789d2c-5e60-4703-a0c2-0589c853f394" xlink:to="loc_cna_AdjustmentsForGainlossOnDisposals_724944bb-ccd3-4be2-80b5-a5d16613f8ec" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss_50aa5550-dee1-427b-8f6a-0bd941904d2e" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital_f4789d2c-5e60-4703-a0c2-0589c853f394" xlink:to="loc_ifrs-full_AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss_50aa5550-dee1-427b-8f6a-0bd941904d2e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_cna_UnrealisedGainslossesArisingFromReMeasurementOfEnergyContracts_5b16d1a2-19b2-4bfc-8cc8-1ad58f534a9a" xlink:href="E26EDV109X6EEPBKVH76-2024-12-31.xsd#cna_UnrealisedGainslossesArisingFromReMeasurementOfEnergyContracts"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital_f4789d2c-5e60-4703-a0c2-0589c853f394" xlink:to="loc_cna_UnrealisedGainslossesArisingFromReMeasurementOfEnergyContracts_5b16d1a2-19b2-4bfc-8cc8-1ad58f534a9a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_cna_GroupOperatingProfitBeforeShareOfResultsOfJointVenturesAndAssociates_cf26e98c-9b19-48ac-96fc-30639f34cad1" xlink:href="E26EDV109X6EEPBKVH76-2024-12-31.xsd#cna_GroupOperatingProfitBeforeShareOfResultsOfJointVenturesAndAssociates"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital_f4789d2c-5e60-4703-a0c2-0589c853f394" xlink:to="loc_cna_GroupOperatingProfitBeforeShareOfResultsOfJointVenturesAndAssociates_cf26e98c-9b19-48ac-96fc-30639f34cad1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForDepreciationAndAmortisationExpense_d92e9673-051d-4f3a-b939-b83c070da00d" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_AdjustmentsForDepreciationAndAmortisationExpense"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital_f4789d2c-5e60-4703-a0c2-0589c853f394" xlink:to="loc_ifrs-full_AdjustmentsForDepreciationAndAmortisationExpense_d92e9673-051d-4f3a-b939-b83c070da00d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForProvisions_c8238009-c49e-401c-b40f-ee8205491322" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_AdjustmentsForProvisions"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital_f4789d2c-5e60-4703-a0c2-0589c853f394" xlink:to="loc_ifrs-full_AdjustmentsForProvisions_c8238009-c49e-401c-b40f-ee8205491322" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForIncreaseDecreaseInEmployeeBenefitLiabilities_3b312f7f-7e43-44e2-b94c-b6af0a346433" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_AdjustmentsForIncreaseDecreaseInEmployeeBenefitLiabilities"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital_f4789d2c-5e60-4703-a0c2-0589c853f394" xlink:to="loc_ifrs-full_AdjustmentsForIncreaseDecreaseInEmployeeBenefitLiabilities_3b312f7f-7e43-44e2-b94c-b6af0a346433" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_cna_OperatingCashFlowsBeforePaymentsRelatingToTaxesExceptionalChargesAndOperatingInterest_092d988e-0a6d-4a8f-97c2-bb527633f2d9" xlink:href="E26EDV109X6EEPBKVH76-2024-12-31.xsd#cna_OperatingCashFlowsBeforePaymentsRelatingToTaxesExceptionalChargesAndOperatingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital_44968813-36ff-4196-922d-d823fea0846b" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_cna_OperatingCashFlowsBeforePaymentsRelatingToTaxesExceptionalChargesAndOperatingInterest_092d988e-0a6d-4a8f-97c2-bb527633f2d9" xlink:to="loc_ifrs-full_CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital_44968813-36ff-4196-922d-d823fea0846b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForDecreaseIncreaseInTradeAndOtherReceivables_20e42529-7aab-4fc5-9b9a-ce4e8988c5d5" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_AdjustmentsForDecreaseIncreaseInTradeAndOtherReceivables"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_cna_OperatingCashFlowsBeforePaymentsRelatingToTaxesExceptionalChargesAndOperatingInterest_092d988e-0a6d-4a8f-97c2-bb527633f2d9" xlink:to="loc_ifrs-full_AdjustmentsForDecreaseIncreaseInTradeAndOtherReceivables_20e42529-7aab-4fc5-9b9a-ce4e8988c5d5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForDecreaseIncreaseInInventories_fd3af7bd-a6f2-4f24-9f14-d6607c0027ae" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_AdjustmentsForDecreaseIncreaseInInventories"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_cna_OperatingCashFlowsBeforePaymentsRelatingToTaxesExceptionalChargesAndOperatingInterest_092d988e-0a6d-4a8f-97c2-bb527633f2d9" xlink:to="loc_ifrs-full_AdjustmentsForDecreaseIncreaseInInventories_fd3af7bd-a6f2-4f24-9f14-d6607c0027ae" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables_1fb8c76a-68e2-45fe-a229-d590be40b351" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_cna_OperatingCashFlowsBeforePaymentsRelatingToTaxesExceptionalChargesAndOperatingInterest_092d988e-0a6d-4a8f-97c2-bb527633f2d9" xlink:to="loc_ifrs-full_AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables_1fb8c76a-68e2-45fe-a229-d590be40b351" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://centrica.com/role/StatementoffinancialpositioncurrentnoncurrentDetails" xlink:type="simple" xlink:href="E26EDV109X6EEPBKVH76-2024-12-31.xsd#StatementoffinancialpositioncurrentnoncurrentDetails"/>
  <link:calculationLink xlink:role="http://centrica.com/role/StatementoffinancialpositioncurrentnoncurrentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Equity_309a8fcb-d492-46cd-af95-261478453789" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_Equity"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EquityAttributableToOwnersOfParent_380dc302-cdbb-4a1e-b05d-26cd1f69972e" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_EquityAttributableToOwnersOfParent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_Equity_309a8fcb-d492-46cd-af95-261478453789" xlink:to="loc_ifrs-full_EquityAttributableToOwnersOfParent_380dc302-cdbb-4a1e-b05d-26cd1f69972e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncontrollingInterests_35cf1f45-9a65-4bf1-91d4-84e587927f27" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_NoncontrollingInterests"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_ifrs-full_Equity_309a8fcb-d492-46cd-af95-261478453789" xlink:to="loc_ifrs-full_NoncontrollingInterests_35cf1f45-9a65-4bf1-91d4-84e587927f27" xlink:type="arc"/>
  </link:calculationLink>
</link:linkbase>
