UK Tools

Finance & Money

UK Mortgage Calculator

Planning a home purchase in the UK starts with understanding what you can afford each month. Our free UK mortgage calculator estimates your monthly repayment based on the loan amount, interest rate and mortgage term — all calculated in your browser with no data stored or sent to a server.

Whether you are a first-time buyer comparing offers or remortgaging at the end of a fixed deal, this tool uses the standard capital-and-interest repayment formula used by UK lenders. Results are estimates only; your actual payments depend on fees, product type and the lender’s underwriting.

Adjust the inputs to model different deposit sizes, rates and terms. Use the results alongside stamp duty and take-home pay calculators on this site for a fuller picture of your monthly budget.

Interactive tool

Property price minus deposit

e.g. 4.5

Commonly 25 or 30

Results

Estimated monthly payment£1,389.58
Loan amount£250,000.00
Total interest£166,874.36
Total repayable£416,874.36

Estimate only for a repayment mortgage. Does not include fees, insurance or overpayments.

How to use this tool

  1. Enter the mortgage loan amount (property price minus your deposit).
  2. Enter the annual interest rate as a percentage (e.g. 4.5).
  3. Choose the mortgage term in years (commonly 25 or 30).
  4. Review the estimated monthly payment, total interest and total amount repayable.
  5. Try different rates and terms to compare scenarios before speaking to a broker or lender.

Frequently asked questions

How is the monthly mortgage payment calculated?
We use the standard capital-and-interest formula: M = P × [r(1+r)^n] / [(1+r)^n − 1], where P is the loan, r is the monthly interest rate, and n is the number of months. This matches how most UK repayment mortgages work.
Does this include interest-only mortgages?
No. This calculator is for repayment (capital and interest) mortgages. Interest-only payments are simply loan × monthly rate and do not reduce the balance.
Are fees and product charges included?
No. Arrangement fees, valuation fees, broker fees and early repayment charges are not included. Always check the APRC and full cost of the product with your lender.
Is this calculator accurate for UK lenders?
It uses the industry-standard repayment formula. Lenders may round differently or include daily interest methods, so treat the result as a close estimate rather than a formal offer.
Is my data stored?
No. All calculations run in your browser. Nothing is sent to our servers or saved in a database.

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