About MortgageSavingsCalculator.co.uk

MortgageSavingsCalculator.co.uk is a free UK-focused mortgage calculator designed to help homeowners understand how mortgage overpayments could reduce interest and shorten their mortgage term.

Our tools provide clear, estimate-based insights using UK mortgage assumptions. No personal details are required to use the calculator and no credit checks are carried out.

MortgageSavingsCalculator.co.uk does not offer mortgage, financial, legal or tax advice. The information provided is for general guidance only and results are illustrative.

Always check your mortgage terms and conditions or speak to a qualified mortgage adviser before making financial decisions.

Free UK mortgage calculator. No email required.

What the calculator does

You enter your balance, interest rate, remaining term and a monthly overpayment, and if you like one lump sum. The calculator charges interest each month on your balance, keeps your contractual payment the same, and estimates how much interest you could save and how much sooner you could be mortgage-free. It also compares that with your lender lowering your payment instead, and checks your overpayments against a typical 10% allowance.

What it does not do

It assumes your interest rate stays the same for the whole term. It does not account for your lender’s terms, fees or early repayment charges, and it does not model interest-only mortgages. Results are estimates for planning, so check your mortgage offer or ask your lender before you overpay.

Our guides

Our mortgage guides explain the same topics in plain English: how overpayments work, allowances and early repayment charges, and how overpaying compares with saving. They are general information, not advice, and they link to the calculator so you can try your own figures. The frequently asked questions answer the most common questions in one place.

Who publishes this site

Mortgage Savings Calculator is a trading name of Marble Cage Limited, which publishes MortgageSavingsCalculator.co.uk. Read our editorial policy and methodology to see how the calculator and guides work. If you spot something that looks wrong or out of date, please tell us through the contact page. You can also read our affiliate disclosure.

Where to start: try the free mortgage overpayment calculator, browse our mortgage guides, or read the frequently asked questions.