Work out your weekly, fortnightly or monthly home loan repayments. See exactly how much interest you'll pay over the life of the loan, and how much you save by adding even small extra repayments. Pure JS, no signup, results update as you type.
Uses the standard Australian P&I formula M = P·r(1+r)^n / ((1+r)^n − 1). Fortnightly is calculated as half the monthly repayment paid 26 times a year, the way major Australian lenders structure it, which is why it pays down faster than 12 monthly payments. Extra repayments are simulated period-by-period against the actual amortisation schedule. Results are indicative, confirm the exact figure with your lender.
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Read the guide →The standard formula is M = P × r(1+r)n / ((1+r)n − 1), where M is the monthly repayment, P is the loan amount, r is the monthly interest rate (annual rate ÷ 12), and n is the total number of months (term in years × 12). This calculator uses the same formula and adapts it for fortnightly and weekly frequencies the way major Australian lenders do.
Most Australian lenders set fortnightly repayments at half the monthly amount. Since there are 26 fortnights but only 24 half-months in a year, you effectively pay an extra month's worth of principal each year, knocking years off the loan term and saving thousands in interest. The savings are automatic; you just choose fortnightly when you set up the loan.
Even small extras compound dramatically. On a $600,000 loan at 6.5% over 30 years, adding $200 per month to the standard repayment cuts the term by about 6 years and saves around $185,000 in interest. Use the extra-repayment input above to model your exact scenario, the results table updates as you type.
Principal & Interest (P&I) repayments pay down both the loan balance and the interest each period, at the end of the term, the loan is fully repaid. Interest Only (IO) repayments cover only the interest; the principal stays the same and the loan must be repaid (or refinanced to P&I) at the end of the IO period (usually 1–5 years). P&I is the default for owner-occupiers. IO is more common for investment loans where the borrower wants lower repayments and is relying on capital growth.
No, this calculator focuses on the repayment maths only. For the full purchase cost (stamp duty, LTO fees, conveyancer, building inspection, Lenders Mortgage Insurance, moving costs and more) open the All-In SA Cost Calculator.
No. SA Property Central is not a lender, broker, or credit provider. This calculator is an information tool only. Actual rates, fees, and approval depend on your lender's assessment. Always confirm figures with your bank or broker before committing.
The standard formula is M = P × r(1+r)n / ((1+r)n − 1), where M is the monthly repayment, P is the loan amount, r is the monthly interest rate (annual rate ÷ 12), and n is the total number of months. This calculator uses the same formula for monthly repayments and adapts it for fortnightly and weekly frequencies.
Most Australian lenders set fortnightly repayments at half the monthly amount. Since there are 26 fortnights but only 24 half-months in a year, you effectively pay an extra month's worth of principal each year, knocking years off the loan term and saving thousands in interest.
Even small extras compound dramatically. On a $600,000 loan at 6.5% over 30 years, adding $200 per month to the standard repayment cuts the term by about 6 years and saves around $185,000 in interest. Use the extra-repayment input above to model your own scenario.
Principal-and-interest (P&I) repayments pay down both the loan balance and the interest each period, at the end of the term, the loan is repaid. Interest-only repayments cover only the interest; the principal stays the same and the loan must be repaid (or refinanced to P&I) at the end of the interest-only period. P&I is standard for owner-occupiers; interest-only is more common for investment loans.
No, this calculator focuses on repayments only. For the full picture (stamp duty, LTO fees, conveyancer, building inspection, Lenders Mortgage Insurance and more) use our All-In SA Cost Calculator.