Loan Repayment Calculator

Estimate weekly, fortnightly, or monthly repayments for principal & interest or interest-only loans.

Tool only — not financial, tax, or legal advice. Figures are estimates. Consult qualified professionals before making decisions.

Loan Repayment Calculator

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Repayment Breakdown

Weekly

$654.69

Fortnightly

$1,309.65

Monthly

$2,838.95

Annual Repayment$34,067.34
Total Interest Cost$522,020.20
Total Repayment Cost$1,022,020.20
Effective Interest Rate5.50%
Total Payments360

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How this calculator works

A principal and interest (P&I) repayment is calculated using the standard amortising loan formula. The calculator divides the annual rate by the number of periods per year and applies it across the full loan term.

For interest-only loans, each period’s repayment is the principal multiplied by the period rate; the principal stays constant until the IO period ends.

An offset account reduces the interest-bearing balance dollar-for-dollar. The calculator subtracts the offset before applying the period rate.

Frequently asked questions

What is principal & interest (P&I)?
Each repayment covers part of the principal and the period’s interest. The loan balance reduces over time.
What is interest-only (IO)?
Repayments cover only the interest, so the principal stays the same during the IO period. Total interest paid is generally higher.
How does an offset account affect repayments?
An offset balance reduces the interest-bearing portion of your loan, lowering interest charged for the period.
How accurate is this calculator?
The math is precise, but real loan repayments depend on lender fees, comparison rates, and rate changes. This tool shows estimates only.