Mortgage amortisation calculator
See exactly how your mortgage payments split between interest and capital month by month. Visualise your 25-year repayment schedule instantly.
10.0% deposit
Loan amount
£225,000.00
Monthly payment
£1,250.62
Total amount repaid
£375,186.92
Total interest paid
£150,186.92
Interest as % of total repaid
40.0%
How does mortgage amortisation work in the UK?
Mortgage amortisation is how each monthly payment is split between interest and capital. In the early years of a typical UK repayment mortgage, most of your payment goes to the lender as interest because the outstanding balance is still high. Over time, more of each payment reduces the loan itself, so the interest portion shrinks and the capital portion grows — even though your monthly payment stays the same on a fixed rate.
Most UK buyers use a mortgage term of around 25 years, though shorter or longer terms are available. Your rate may be fixed for a set period or track an external measure such as the Bank of England base rate plus a margin. Fixed deals give predictable payments; tracker products can rise or fall if rates move. This calculator uses your property price, deposit, rate, and term to show the full schedule so you can see when capital repayments overtake interest and how much the loan costs in total.
If you are weighing rent versus buying, try our rent affordability calculator and should I buy this? tool for quick affordability checks. This page is for illustration only and is not regulated financial advice — speak to a qualified mortgage adviser before making decisions.