Mortgage calculator
Mortgage repayment calculator
Capital-and-interest repayments on any loan amount, rate and term, with the total interest you would pay over the full term and how the balance falls year by year.
- Bank of England base rate
- 3.75%
- 2-year fix, 75% LTV
- 4.92%
- 5-year fix, 75% LTV
- 4.77%
UK average quoted rates · Source: Bank of England, September 2026 · updated monthly. Reference data only — not a product offer and not advice.
Monthly repayment
£4,285
Total interest
£535,354
Total repaid
£1,285,354
Based on the current UK average of 4.77% for a 5-year fix at 75% LTV — Bank of England, September 2026. Updated monthly. Reference data only, not a product offer.
| Year | Interest paid | Capital repaid | Balance |
|---|---|---|---|
| 1 | £35,429 | £15,986 | £734,014 |
| 5 | £32,075 | £19,339 | £661,888 |
| 10 | £26,878 | £24,536 | £550,097 |
| 15 | £20,284 | £31,130 | £408,263 |
| 20 | £11,918 | £39,496 | £228,312 |
| 25 | £1,304 | £50,110 | £0 |
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What you're looking for
Step 1 of 2Indicative only. This is not financial advice, a mortgage offer or a tax computation. Confirm the figures with a qualified broker, solicitor or tax adviser before you commit.
Questions we get asked
- How is the monthly repayment worked out?
- With the standard annuity formula: M = P·r(1+r)^n ÷ ((1+r)^n − 1), where P is the amount borrowed, r the monthly interest rate and n the number of monthly payments. Every payment covers the interest accrued that month first, and the remainder reduces the balance.
- Why does a longer term cost so much more?
- Stretching a loan from 25 to 35 years lowers the monthly figure but adds ten more years of interest on a balance that falls slowly at the start. The amortisation summary below shows how little capital comes off in the early years.
- Does this include fees, insurance or ground rent?
- No. It is the capital-and-interest repayment only. Arrangement fees, buildings insurance, service charge and ground rent on a leasehold flat all sit on top and matter a great deal in London.
- What rate should I assume?
- Use the rate you have actually been quoted for the fixed period, then re-run the calculator at two or three percentage points higher to see what a remortgage could look like when the fix ends.