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
£280,000 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% | £1,624 | £1,402 | £1,257 | £1,157 |
| 4.0% | £1,697 | £1,478 | £1,337 | £1,240 |
| 4.5% | £1,771 | £1,556 | £1,419 | £1,325 |
| 5.0% | £1,848 | £1,637 | £1,503 | £1,413 |
| 5.5% | £1,926 | £1,719 | £1,590 | £1,504 |
| 6.0% | £2,006 | £1,804 | £1,679 | £1,597 |
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.