UK Mortgage Calculator

Enter a loan amount and interest rate. The chart shows how the monthly payment and total interest change with the term length of a standard UK repayment mortgage.

Quick estimate from salary & deposit
Monthly payment —
Total repaid —
Total interest —
Monthly payment (left axis) and total interest over the lifetime of the loan (right axis) vs mortgage term. Tap the chart to set the highlighted term.

Payment breakdown over the selected term

How each monthly payment splits between interest (orange) and capital (blue) for the highlighted term. Early payments are mostly interest; as the balance shrinks the capital portion takes over.
How the numbers are worked out

This uses the standard UK repayment-mortgage formula. For a principal P, a monthly interest rate r (annual rate divided by 12), and n monthly payments: 

M = P · r · (1 + r)^n / ((1 + r)^n − 1)

It assumes a fixed rate for the whole term, which isn't how UK mortgages actually work — most are fixed for 2–5 years and then revert to a variable rate. Real lenders also add fees, stress-test affordability, and round differently. Treat this as a rough planning tool, not advice.