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Mortgage Repayment Calculator

See your weekly, fortnightly or monthly repayment in seconds

Plan your home loan with confidence. Enter your loan amount, interest rate and term to instantly see your repayment schedule, total interest cost, and how extra repayments or an offset account can shave years off your loan.

Free — no account required

By the numbers

30yr

Max loan term

3

Repayment frequencies

IO

Interest-only support

$0

Cost to use

What you can calculate

  • Weekly, fortnightly, and monthly repayment frequencies
  • Total interest paid over the full loan term
  • Effect of extra repayments — months saved and interest reduction
  • Interest-only period modelling for investor loans
  • Full amortisation schedule showing principal vs. interest split
  • Free and instant — no account required

Frequently asked questions

How is a mortgage repayment calculated?

Your repayment is calculated using the standard amortisation formula: each payment covers the interest accrued since the last payment plus a portion of principal. Early payments are mostly interest; later payments are mostly principal.

Does paying fortnightly really save money?

Yes. Fortnightly payments result in 26 half-payments per year — equivalent to 13 monthly payments rather than 12. That extra month of principal reduction each year compounds to save significant interest over a 25–30 year loan.

What is the difference between P&I and interest-only?

Principal & Interest (P&I) repayments pay down both the loan balance and interest from day one. Interest-only repayments cover only the interest for a set period (usually 1–5 years), keeping repayments lower but not reducing the debt.

Mortgage Repayment Calculator

See your weekly, fortnightly or monthly repayment in seconds

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Important disclaimer

This tool provides general educational information and scenario-based decision support only. It does not provide financial, tax, legal, credit, or investment advice. Property decisions involve risk. Users should confirm loan eligibility with a licensed mortgage broker or lender, tax implications with a registered tax agent or accountant, and legal matters with a solicitor or conveyancer.