Mortgage Calculator
Estimate monthly principal-and-interest home-loan repayments and total interest from the property price, deposit, rate and term you enter.
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How this calculator works
Estimate principal-and-interest repayments on an Australian home loan. Enter the property price and deposit to derive the loan amount, then add the interest rate and term to calculate repayments and total interest paid.
What changes your mortgage repayment the most
For the monthly principal-and-interest schedule used here, the repayment is mainly driven by the amount borrowed, the entered interest rate and the loan term. Changing any one of those inputs can materially change both the monthly repayment and total interest.
Use the calculator to test more than one scenario instead of relying on a single interest-rate assumption. A higher-rate scenario can show how much room you have in your budget if lending rates rise.
- Compare repayments at different interest rates
- See the effect of a shorter or longer loan term
- Estimate total interest as well as the regular repayment
Mortgage repayment estimate versus borrowing approval
A repayment calculator answers what a loan would cost under the inputs you choose. It does not decide how much a lender will approve, because lenders separately assess income, expenses, existing debts, credit policy and serviceability buffers.
Lenders may calculate interest daily, round scheduled repayments and charge establishment, package or account fees not entered here. Compare the estimate with the lender's key facts sheet, written repayment schedule and full fee disclosure.
Official sources and assumptions
Check the official or authoritative references used to review this calculator's rates, formulas and assumptions.
Frequently asked questions
Does this include fees?
No. Application, valuation and ongoing account fees are not included in the repayment figure.
Should I pay weekly or monthly?
This calculator models monthly repayments only. Use the separate fortnightly-versus-monthly calculator to compare equal annual payment timing with a half-monthly fortnightly strategy.
Is my rate fixed?
The calculator assumes a constant rate. Variable rates change over the life of a loan.
Content responsibility
Maintained by CalcAussie and last updated 30 September 2026. Checks applied: calculation method, worked examples, Australian terminology, material assumptions, official references where an external rule applies, and user-facing limitations.
Calculator results remain estimates based on the figures entered. Check material decisions against current official information and report a suspected error so it can be reproduced and corrected.
Results are estimates only and are not financial, tax, legal or credit advice.