Housing Calc Pro

Mortgage repayment calculator

Saving1 min read23 October 2026

By · Published

Enter the loan, the interest rate and the term to see your monthly repayment, the total interest and the total you will pay back. Free to use 3 times a day, with no sign-up. Everything is worked out in your browser.

Monthly repayment–
Total interest–
Total repaid–

How it works

For a capital and interest mortgage, the monthly repayment is P × r(1+r)n / ((1+r)n − 1), where P is the loan, r is the monthly rate (annual rate ÷ 12) and n is the number of monthly payments. For interest only, you pay P × r each month and still owe the full loan at the end of the term.

This is a guide only. Lenders add fees, and rates can change during the term. Check the exact figures with your lender or a qualified mortgage adviser before you decide.

Sources and further reading

Official and primary sources covering the topics in this article:

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