Free Mortgage Calculator Australia
Estimate home loan repayments, total interest, and a 20% deposit scenario — weekly, fortnightly, or monthly.
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Estimates only, not tax or financial advice. Results are general information based on published ATO rules and the figures you enter. For advice about your situation, speak to a registered tax agent or licensed financial adviser. How we calculate · Spotted a mistake?
Mortgage repayment formula
Standard principal-and-interest repayments use the amortising loan formula based on loan amount, annual interest rate, and term in months.
- Monthly rate r = annual rate ÷ 12
- n = years × 12
- Repayment = P × [r(1+r)^n] / [(1+r)^n − 1]
Worked example: $600,000 loan at 5.9% over 30 years
- Loan P = $600,000; annual rate 5.9%; term 30 years.
- Monthly rate ≈ 0.4917%.
- Calculate the amortising repayment and total interest over the term.
- Try extra repayments to see interest saved and years cut.
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