Mortgage Repayment Calculator
A free, browser-based calculator. Runs entirely in your browser — no sign up, nothing stored.
100% FreeRuns in your browserIntermediate
Enter Values
Enter your values and press Calculate to see results.
How to use this calculator
- Enter the loan amount, the annual interest rate and the loan term.
- Press Calculate for the monthly repayment and total interest.
How it works
A mortgage is repaid in equal instalments using the amortised formula M = P·i ÷ (1 − (1 + i)^−n), where i is the monthly interest rate and n the total number of monthly payments.
Worked example
$500,000 at 6% over 30 years. That's roughly $3,000 a month — change the inputs to match your loan.
Frequently asked questions
Fixed or variable?
This assumes a fixed rate for the whole term. A variable rate changes your repayment when rates move.
Related tools
Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.