Mortgage Affordability Calculator Guide

Affordability is more than an income multiple. Lenders also consider committed spending, credit commitments, dependants, term and stress testing.

Start with these estimates

Primary tool Estimate affordability Helpful next check Check possible repayment

Calculator outputs are estimates only. They do not confirm lender acceptance, product availability, rates, fees or suitability.

This page is written as a calculator companion: use it to choose sensible inputs, compare scenarios and understand the limits of an estimate.

What to check before relying on the estimate

Use gross annual income as a starting point, then allow for credit commitments and household costs.
Treat the result as a range, not a decision from a lender.
Consider whether the estimated payment remains affordable if rates change later.

When an adviser review may help

A mortgage adviser or broker partner can compare your circumstances with lender criteria and explain any fees before you decide whether to proceed. This website provides general information and calculator tools; it provides general information only and does not make regulated mortgage recommendations.

Keep the estimate realistic

Use current balances, evidenced income, realistic property values and cautious rate assumptions. If a result looks affordable only under one optimistic assumption, run a second scenario before making plans.

Frequently asked questions

Do lenders use the same affordability calculation? +

No. Lenders use different models and criteria, so results can vary.

Will a calculator affect my credit score? +

No. Using this website calculator does not run a credit search.

Browse mortgage calculators Compare repayment, borrowing, affordability and stamp duty estimates. Check your affordability Estimate affordability from income and commitment assumptions. Estimate monthly repayments Model repayments using your own rate, term and deposit assumptions.

Calculator-led mortgage planning

UK Mortgage Calculators is centred on practical estimation tools. The pages help you model cautious scenarios before you decide whether to request a broker or adviser callback.