Mortgage Repayment Calculator (UK)
Work out the monthly repayment on a repayment mortgage, and see how much you would pay back in total over the life of the loan.
Your details
The mortgage amount — the property price minus your deposit.
The annual interest rate on the mortgage.
Your results
Your figures appear here as you fill in your details.
This calculator is for educational purposes only and is not financial advice or a mortgage quote. Lenders assess affordability and rates individually. For personalised advice, speak to a qualified mortgage adviser.
How this works
This uses the standard repayment-mortgage (amortisation) formula:
M = P · r(1 + r)ⁿ / ((1 + r)ⁿ − 1)
where P is the amount borrowed, r is the monthly interest rate (the annual rate ÷ 12), and n is the number of monthly payments (years × 12). Each month you pay the same amount; early on more of it is interest, and over time more goes towards clearing the balance.
At a 0% rate the formula simplifies to the amount borrowed divided by the number of months.
Assumptions
- A repayment mortgage (not interest-only), with a single fixed interest rate for the whole term.
- The rate never changes — in reality most deals are fixed for a few years, then move to a variable rate.
- No fees, overpayments, or missed payments are included.
Last updated . Figures are UK-specific — check current rates on GOV.UK before acting.