How do I calculate mortgage repayments in Australia?

Use loan amount, interest rate, loan term and repayment frequency in a principal-and-interest repayment formula.

Is monthly or fortnightly repayment better?

Fortnightly can reduce interest over time because payments are applied more frequently, but impact depends on lender setup and calendar handling.

Does this calculator include fees and stamp duty?

No. This calculator focuses on principal and interest. Include purchase and ongoing property costs separately.

Mortgage repayment calculator

Calculate principal and interest repayments by frequency before locking your borrowing range.

Your loan

Set loan amount, buyer type, and property value.

Loan amount$500,000

$100,000$2,000,000

Situation

Property value$700,000

$100,000$3,000,000

LVR71.4%

Explore full mortgage analysis →

Total interest and payoff horizon show whether a "comfortable" repayment is quietly locking you into a weak long-term position. Extra repayments only matter if they are sustainable. Test the version of your budget that survives normal life noise, not the perfect month.

This page should establish the baseline number. The next move is stress testing, not assuming today's repayment will stay comfortable. A repayment number is useful only when it survives stress.

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Frequently Asked Questions

How do I calculate mortgage repayments in Australia?: Use loan amount, interest rate, loan term and repayment frequency in a principal-and-interest repayment formula.
Is monthly or fortnightly repayment better?: Fortnightly can reduce interest over time because payments are applied more frequently, but impact depends on lender setup and calendar handling.
Does this calculator include fees and stamp duty?: No. This calculator focuses on principal and interest. Include purchase and ongoing property costs separately.