Mortgage Repayment Calculator UK

Calculate your monthly mortgage payments, total interest, and see how overpayments can reduce your mortgage term.

Last updated: March 5, 2026

Reviewed by: RepublicDaily UK Research Team

Sources: MoneyHelper mortgages, UK Finance

Enter the annual percentage rate from your mortgage offer
Extra monthly payment to pay off your mortgage faster
£0
Monthly Payment

Frequently Asked Questions

Monthly payments are calculated using the amortization formula, which considers the loan amount, interest rate, and term. Each payment covers interest on the outstanding balance and reduces the principal. The formula ensures the loan is fully repaid by the end of the term.
An amortization schedule shows how each payment is split between interest and principal over the life of the loan. In the early years, most of your payment goes toward interest. As the principal decreases, more of each payment goes toward paying off the loan.
Overpayments reduce your principal faster, which means less interest is charged overall. This can significantly reduce your mortgage term and total interest paid. Even small regular overpayments can save thousands in interest and take years off your mortgage.
Use the APR (Annual Percentage Rate) from your mortgage offer. This includes the interest rate plus certain fees, giving a more accurate picture of the total cost. For fixed-rate mortgages, you can use the fixed rate during that period.
Most mortgages have limits on overpayments, typically 10% of the outstanding balance per year without incurring early repayment charges. Check your mortgage terms as exceeding this may result in fees. Some flexible mortgages allow unlimited overpayments.
At the end of the term, if all payments have been made according to schedule, you own the property outright with no outstanding debt. The mortgage is discharged and the lender removes their charge from the property title.
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