Mortgage Calculator UK 2026

A repayment mortgage spreads the loan plus interest over the term using a standard amortisation formula. Each monthly payment covers the interest on the outstanding balance plus a slice of the capital. This mortgage calculator applies that formula to the loan (price minus deposit), your rate and your term.

Use the rate on your actual deal, or a current market figure. In 2026 the Bank of England base rate has sat around 4%, with typical two- and five-year fixes roughly in the 4.3%–4.6% range for mainstream loan-to-values. Your rate depends on your deposit, credit and lender.

LTV is your loan as a percentage of the property's value. A bigger deposit means a lower LTV, which usually unlocks lower interest rates — the cheapest deals are often at 60% LTV or below. The calculator shows your LTV as you change the deposit.

Overpaying reduces the balance interest is charged on, so even a small monthly overpayment can save thousands in interest and clear the mortgage years early. Check your lender's annual overpayment limit (often 10%) first. Use the overpayment slider above to see the effect.

Beyond the deposit and monthly payments, budget for an arrangement or product fee (often £0–£1,499), a valuation fee, legal/conveyancing costs, and — above the threshold — Stamp Duty Land Tax. A low headline rate with a high fee can cost more than a slightly higher fee-free rate.