UK mortgage calculators
Mortgage Repayment Calculator
Enter your figures
Your estimate will appear here.
What this result means
A repayment mortgage payment is designed to cover the month's interest and repay some capital so the modelled balance reaches zero at the end of the term.
How to use the calculator well
- Enter the amount borrowed rather than the purchase price.
- Use the rate for the scenario you want to test and the contractual term.
- Stress-test a higher rate instead of relying only on today's payment.
Worked scenario
The reviewed £200,000, 5%, 25-year example produces an estimated monthly repayment of £1,169.18. A lender may calculate interest daily and apply fees or timing conventions that create a different figure.
Questions people ask
Why does a small rate change matter?
Interest applies to a large outstanding balance over many months, so a modest percentage change can materially affect payments and total interest.
Does this show what I can borrow?
No. Lenders assess income, spending, commitments, credit information, deposit and their own affordability rules.
Sources and review standard
Calculations are independently implemented illustrations and were reviewed on 4 September 2026. We check factual boundaries against MoneyHelper's mortgage cost guidance, FCA consumer mortgage information and relevant lender documentation. Rates and product terms are never presented as live offers.
Before relying on this estimate
This is an educational illustration, not mortgage, financial, tax or legal advice, a lender decision or an offer. Exact rates, fees, early-repayment charges and product rules can materially change the result.
Check the figures with your lender, broker or qualified adviser. Your home may be repossessed if you do not keep up repayments on your mortgage.
Editorial responsibility
Published by Acerville Sparks Limited. Software assists research, drafting and automated formula testing. Primary sources, assumptions and limitations are shown so readers can inspect the work. No independent mortgage professional or financial adviser review is claimed. Reviewed 4 September 2026.