Mortgage Repayment Calculator UK
Calculate your monthly mortgage repayment, total amount repaid and total interest based on the amount borrowed, interest rate and term. Uses the standard capital-and-interest repayment formula.
Calculator
What this means
A repayment mortgage spreads the amount you borrow plus interest across equal monthly payments. Early payments are mostly interest; later payments clear more of the balance. A longer term lowers the monthly cost but increases total interest.
How to use this calculator
- Enter the amount you want to borrow.
- Enter the interest rate and the mortgage term in years.
- See your monthly repayment and the total interest over the term.
Worked example
You borrow £200,000 over 25 years at 4.5%.
- The calculator spreads capital and interest over 300 monthly payments.
- Lower rates or shorter terms reduce the total interest paid.
Monthly repayments are around £1,112, with total interest of roughly £133,000 over the full term.
Who this is for
- First-time buyers estimating monthly costs.
- Homeowners comparing remortgage deals.
- Anyone testing how a change in rate or term affects payments.
What affects your mortgage repayment
A repayment mortgage pays off both interest and capital, so the balance reduces to zero by the end of the term. Your monthly payment depends on the amount borrowed, the interest rate and the term length.
A longer term lowers the monthly payment but increases total interest. A higher rate raises both. Overpaying, where allowed, can cut the interest you pay significantly.
Frequently asked questions
No. This estimates the core capital-and-interest repayment only. Arrangement fees, buildings insurance and any product fees are not included.
Use the rate from your mortgage offer or current deal. When a fixed rate ends, your payments may change based on the new rate.
No. This calculator assumes a repayment (capital-and-interest) mortgage where the balance is cleared by the end of the term.
This calculator assumes a capital-and-interest (repayment) mortgage, where you clear the balance by the end of the term. Interest-only payments would be lower but leave the full balance outstanding.
You usually move to the lender's higher standard variable rate unless you remortgage. Re-run this calculator with the new rate to see the impact.
Disclaimer
This calculator provides estimates for guidance only. It is not financial, legal or tax advice. Always check official sources or speak to a qualified professional before making decisions.
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