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Mortgage Balance at Renewal Calculator

Estimate how much you'll still owe when your current mortgage deal ends. Enter your balance, interest rate and monthly payment to see your projected balance, how overpayments could change it, and your estimated loan to value.

Calculator guidance reviewed

Your details

Your figures

Enter your current mortgage details. Your estimate updates automatically.

Your estimate appears below the form. Use “View estimate” to jump to it.

Current mortgage and deal
The amount you currently owe on your mortgage.
The interest rate you're currently paying, not the rate you expect to get when you remortgage.
Your normal monthly mortgage repayment.
Choose the month shown in your mortgage offer or latest statement.
Optional overpayment amounts Shown when overpayments are enabled
Your overpayments
Property value for LTV Shown when LTV is enabled
Optional loan to value estimate

This calculator estimates a repayment mortgage using monthly interest. Your lender may calculate interest daily, so check your statement or lender for an exact figure.

Live results

Your renewal balance estimate

Updates live

Your estimate

What your figures show

Change your figures to explore how this estimate responds.

Estimated balance when your deal ends

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Capital repaid before renewal

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Estimated interest paid

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An illustrative estimate, not a guarantee. See the breakdown and assumptions before making a decision.

Read your estimate

What these numbers mean

Before you decide

  • Lender interest timing and payment rules may differ.
See the breakdown

Current balance

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Total regular payments

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Total overpayments

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Months until renewal

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Current loan to value

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Estimated loan to value at renewal

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Payments and interest stop if the mortgage is repaid before the deal end.

How it is calculated

    Mortgage balance until your deal ends

    Balance checkpoint table
    Estimated mortgage balances at annual checkpoints and the deal end
    TimeWithout overpaymentsYour estimate

    Your next step

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    About this calculator

    Estimate how much you'll still owe when your current mortgage deal ends. Enter your balance, interest rate and monthly payment to see your projected balance, how overpayments could change it, and your estimated loan to value.

    How to use this calculator

    Who this calculator is for

    This calculator is for people with a standard capital-and-interest repayment mortgage who want an estimate of the balance remaining when their current fixed, tracker or other deal ends. It does not support interest-only, part-and-part or offset mortgages.

    What information to enter

    Use the balance and interest rate from your latest mortgage statement, your normal contractual monthly payment, and the month your current deal ends. If you make overpayments, add a regular monthly amount or a lump sum that you intend to pay now. To estimate loan to value (LTV), add a realistic current property value.

    How the result is worked out

    The model first subtracts any immediate lump sum. Each month it charges one twelfth of the entered annual interest rate on the opening balance, then subtracts the normal payment and monthly overpayment. It stops when the deal ends or the balance reaches zero. LTV is the mortgage balance divided by the entered property value, multiplied by 100. Currency is rounded only for display.

    Worked example

    For a £200,000 balance at 4.5%, paying £1,200 a month for 24 months with no overpayments, the estimated balance is about £188,721. Around £11,279 of capital is repaid and about £17,521 of interest is charged over the period. With a £300,000 property value held unchanged, LTV falls from about 66.67% to 62.91%.

    What this calculator leaves out

    It excludes changing rates, product fees, early repayment charges, payment holidays, arrears, lender-specific rounding and daily interest. It does not predict property values, assess affordability, recommend future mortgage products or provide a redemption statement. Any LTV estimate assumes the property value entered stays unchanged.

    What to do next

    Compare the estimate with your mortgage statement and ask your lender for an exact balance when needed. Knowing the likely balance and estimated LTV can help you plan a remortgage, compare future deals or consider overpayments. A lender may use its own property valuation. Check your mortgage terms for overpayment limits and charges before paying extra.

    What does “mortgage balance at renewal” mean?

    It is the amount likely to remain outstanding when your current mortgage deal ends. It is not a quote for a new mortgage and does not mean remortgaging is necessarily the right option.

    Why might my lender's figure be different?

    Your lender may calculate interest daily, use exact payment and overpayment dates, apply fees or charges, reflect payment changes, use its own property valuation, and follow lender-specific calculation rules.

    Frequently asked questions

    Is the estimated renewal balance exact?

    No. Your lender may calculate interest daily and use exact transaction dates or lender-specific rules. Check your statement or lender for an exact figure.

    When is the one-off overpayment applied?

    Version 1 assumes the lump sum is paid now, before the first projected month's interest is calculated.

    What happens if my mortgage is repaid before the deal ends?

    The estimate stops charging interest and applying payments once the modelled balance reaches zero.

    Can I use this for an interest-only mortgage?

    No. This version is designed only for standard capital-and-interest repayment mortgages.

    What if my deal ends this month?

    The calculator shows the balance after any immediate lump-sum overpayment and assumes no further monthly payment before the deal ends. Check your exact payment and deal-end dates with your lender.

    How is the loan to value estimate calculated?

    The calculator divides the mortgage balance by the property value you enter and multiplies by 100. It holds that property value unchanged, while a lender may use a different valuation.