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Mortgage Repayment Calculator UK

Work out an estimated monthly mortgage payment based on the property price, deposit, interest rate, and term.

This calculator is for illustration only and provides estimates for general information. It is not mortgage advice, a mortgage offer, a decision in principle or a guarantee of rates, fees, eligibility or savings.

Mortgage Repayment Calculator

Estimate your monthly mortgage repayment.

Compare another scenario

Add a second set of figures to compare estimated payments side by side.

Comparison figures are saved for this browser session only. Results remain estimates and are not mortgage offers.

Monthly payment
£—
Total interest
£—
Loan-to-value
—%

Estimate only. Excludes lender fees, broker fees, valuation, insurance, and rate changes.

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Keep a copy of this estimate

Email yourself a PDF summary of the figures currently shown on this calculator.

Calculator results are estimates only. Actual rates, fees, eligibility and products depend on your circumstances and lender criteria.

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How to use this calculator

  • Property price — the agreed price or your budget if you’re still searching.
  • Deposit — your contribution. The remainder becomes the mortgage.
  • Interest rate — the rate quoted on the mortgage product.
  • Term — how many years you’ll spread the loan over. Common UK terms are 25–35 years.
  • Repayment type — most residential mortgages are capital + interest. Interest-only is mainly used for buy-to-let.
  • Comparison mode — add a second scenario to compare estimated monthly payment, total interest, and loan-to-value side by side during your session.

What the result means

The “monthly payment” is the amount you’d pay each month on a level repayment basis. “Total interest” is the cumulative interest across the full term — useful for comparing 25-year vs 30-year terms. “Loan-to-value” is the mortgage as a percentage of the property price; lower LTV may affect the products and rates available to you.

Things this calculator does not include

  • Lender product fees and broker fees.
  • Valuation, conveyancing and stamp duty.
  • Buildings insurance.
  • Future rate changes when your fixed deal ends.
  • Your personal affordability assessment.

Want help comparing options?

If you’d like an authorised mortgage adviser or broker partner to look at the actual products you could apply for, request a callback. There’s no obligation.

Frequently asked questions

Is this a real UK mortgage repayment calculator? +
Yes. It uses the standard amortisation formula UK lenders use to calculate monthly repayments for capital + interest mortgages, and a simple interest-only calculation if you choose that option.
Does the calculator include fees? +
No. The headline figure is principal + interest only. Lender arrangement fees, valuation fees, broker fees, ERCs and insurance are not included.
Why is my actual payment different? +
Lenders calculate to the penny, factor in payment dates, and may apply early-month or end-month interest accrual differently. Your offer is the source of truth.
Should I use a 25 or 30 year term? +
Longer terms lower the monthly payment but raise total interest. Many UK mortgages run 25–35 years. Use the calculator to compare both.
How does interest-only work? +
Interest-only payments cover only the interest each month. The loan balance does not reduce — you need a separate repayment plan agreed with the lender.

Suggested next steps

Related calculators and guides

Offset Mortgage Calculator GuideUnderstand how an offset mortgage could affect interest estimates when savings are linked to a mortgage balance.Fixed Rate Mortgage Calculator GuideEstimate monthly payments for a fixed-rate mortgage and compare the effect of term, balance and rate assumptions.Mortgage Rate Change Calculator GuideEstimate how a different mortgage rate could change monthly repayments on an existing or planned mortgage.

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.