Mortgage Calculator (UK, 2026)
Free monthly-payment calculator for any UK mortgage. Enter a price, deposit, rate and term — see your payment, total interest, and a comparison matrix across rates and terms. Defaults use Bank of England's recent quoted rate.
Monthly payment matrix
£150,000 loan, monthly payment by interest rate × term. Compare 2/5/10-year fixes by entering their rate above; this matrix shows where you'd land if rates moved.
| Rate \ Term | 20 yrs | 25 yrs | 30 yrs | 35 yrs |
|---|---|---|---|---|
| 3.5% | £870 | £751 | £674 | £620 |
| 4.0% | £909 | £792 | £716 | £664 |
| 4.5% | £949 | £834 | £760 | £710 |
| 5.0% | £990 | £877 | £805 | £757 |
| 5.5% | £1,032 | £921 | £852 | £806 |
| 6.0% | £1,075 | £966 | £899 | £855 |
How it works
The calculator uses the standard amortising-loan formula:
M = P × (i × (1+i)n) / ((1+i)n − 1)
Where P is the loan amount (price minus deposit), i is the monthly interest rate (annual rate ÷ 12), and n is the total number of monthly payments (term × 12). Interest is calculated on the outstanding balance, so the early years are interest-heavy.
Quick examples
- £200k home, 10% deposit, 25 years at 4.32%
- £300k home, 20% deposit, 25 years at 4.32%
- £500k home, 20% deposit, 30 years at 4.32%
- £750k home, 20% deposit, 25 years at 4.5%
Related guides
This calculator is a general-information tool, not a mortgage offer or financial advice. Your actual rate depends on lender, LTV, credit profile, product fees and stress-test outcomes. Speak to a regulated mortgage adviser before committing. Source for default rate: Bank of England's monthly effective interest rates.