Moving Home Mortgage Calculator Guide

When you move home, the useful question is often how your current equity and new borrowing combine. Use estimates to test affordability before making commitments.

Start with these estimates

Primary tool Estimate the new payment Helpful next check Check loan-to-value

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

Estimate sale proceeds after any existing mortgage and expected selling costs.
Check whether a new loan amount changes your loan-to-value band.
Ask your lender or adviser about porting, early repayment charges and new product options.

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

Can I port my current mortgage? +

Some mortgages are portable, but lender approval, affordability and property checks still apply.

Does moving home always mean remortgaging? +

No. You may port, take a further advance, choose a new product or move lender, depending on your circumstances.

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.