Loan repayment calculator
Estimate your repayments, total interest and loan balance over time.
Your loan assumptions
Example inputs only — not a lender offer. Change the values to compare scenarios.All amounts are in Australian dollars.
Repayments display to cents; totals use unrounded calculations, with the final payment adjusted to clear the balance. Fees are excluded.
An interest-only period does not reduce your loan balance. Later repayments rise because the principal is repaid over the remaining term. The same rate is assumed in both phases.
Your balance over time
Year-end balances; the interest-only phase, if selected, appears as a flat line.
View annual repayment schedule
| Year | Balance | Principal repaid to date | Interest paid to date |
|---|
Compare repayment frequencies
Same loan amount, rate and term. Each frequency is calculated separately — fortnightly repayments are not simply half the monthly amount.
Paying half the monthly amount every fortnight is a different, accelerated strategy: 26 half-payments equal 13 monthly payments a year. This page does not model that strategy.
Assumptions and sources
A transparent repayment model
The annual nominal interest rate is divided by 12, 26 or 52. Interest compounds at the selected repayment frequency; payments are at each period’s end. There are no extra repayments, fees, offset balances, redraws or rate changes.
For principal & interest: payment = P × r ÷ [1 − (1 + r)⁻ⁿ]. P is the outstanding principal, r the periodic rate and n the remaining payment count. At 0% interest, payment = P ÷ n.
During the initial interest-only phase: payment = P × r. Afterwards the unchanged principal is amortised over the remaining term.
An estimate, not an approval
Actual lenders may accrue interest daily, apply different repayment conventions, charge fees or change rates. This calculator does not assess affordability, borrowing capacity or loan eligibility, and is not financial advice.
Method and limitations reviewed against ASIC Moneysmart on 1 November 2026. Confirm a repayment schedule with your lender or licensed finance professional.