Enter the property price, deposit, rate and term to see your monthly mortgage repayment and the total interest. Borrowing £270,000 (a 10% deposit on £300,000) over 25 years at 6.00%, the Moneyfacts average five-year fix on 5 October 2026, costs about £1,739.61 a month on a repayment mortgage.
Mortgage Repayment Calculator
Monthly repayments for UK mortgages · Updated 12 October 2026
- Mortgage amount
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- Loan to value (LTV)
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- Total interest over the term
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- Total repaid
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Assumes the rate stays the same for the whole term. Most fixed deals revert to the lender’s standard variable rate when the fixed period ends.
How repayments are worked out
A repayment mortgage uses the standard amortisation formula: monthly payment = L × r × (1 + r)n ÷ [(1 + r)n − 1], where L is the loan, r is the annual rate ÷ 12 and n is the number of months. An interest-only mortgage charges just L × r each month and the full loan is still owed at the end.
Rate and term make a big difference
| Rate | 25 years | 30 years | 35 years |
|---|---|---|---|
| 4.50% | £1,500.75 | £1,368.05 | £1,277.79 |
| 5.00% | £1,578.39 | £1,449.42 | £1,362.66 |
| 5.98% | £1,736.31 | £1,615.32 | £1,535.89 |
| 6.00% | £1,739.61 | £1,618.79 | £1,539.51 |
Over 25 years at 6.00% you would repay about £521,884 in total, of which £251,884 is interest. Stretching the term to 35 years lowers the payment by about £200 a month but adds roughly £124,700 of interest.
Loan to value matters
Lenders price mortgages in loan-to-value bands such as 60%, 75%, 85%, 90% and 95%. A bigger deposit that moves you into a lower band can unlock a cheaper rate, which saves far more than the deposit itself over the life of the loan.
FAQs
What happens when my fixed rate ends?
You usually move to the lender’s standard variable rate, which is often much higher. Most borrowers remortgage or take a new product with the same lender before the deal ends.
Does this include fees?
No. Arrangement fees, valuation and legal costs are not included. If you add an arrangement fee to the loan, include it in the mortgage amount.
Related calculators
- Stamp Duty CalculatorSDLT on your purchase
- Take-Home Pay CalculatorCheck the payment fits your salary
Sources
- ITV News: Average five-year mortgage fix hits 6% (Moneyfacts data) · 5 October 2026
Figures current as of 12 October 2026
Each formula is checked against a separate test sheet with at least three worked examples. Results are estimates based on the numbers you enter and the published rules; your actual figures may differ. This is general information, not financial or tax advice.
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