Loan Amortisation Calculator

Estimate your monthly repayment and see how principal and interest change over the life of the loan.

Your loan details

This is an estimate for a fixed-rate repayment loan. Actual lender schedules can differ because of fees, timing and rounding.

Amortisation schedule

Each payment is split between interest and principal. Earlier payments usually contain more interest, while later payments reduce more principal.

Payment Payment Principal Interest Balance

To keep the page readable, the schedule shows the first 12 payments, yearly checkpoints, and the final payment.

How loan amortisation works

A standard repayment loan uses a fixed payment formula. Each month, interest is charged on the outstanding balance and the remainder of the payment reduces principal.

Payment = P × [r(1+r)^n] / [(1+r)^n − 1]

Frequently asked questions

Why does the interest portion fall over time?

Interest is calculated on the remaining balance. As the balance falls, less interest is charged each month.

Does this include early repayments?

No. This version assumes the scheduled payment only. An early-repayment calculator can model overpayments separately.