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Interest Rate Calculator

Find the interest rate on a loan or investment, convert between nominal and effective rates, and compare Australian loan comparison rates.

Find the Interest Rate

Enter loan/investment details to calculate the implied interest rate.

Loan Amount (PV) ?
$
Regular Payment ?
$
Loan Term ?
years
Future Value (FV) ?
$
Payment Frequency
Rate Converter

Convert between nominal and effective annual rates.

Nominal Rate ?
% p.a.
Compounding
Results
Annual Interest Rate
6.45% p.a.
Value
Current Australian Rate Reference (2026)
Rate TypeApprox. Rate
RBA Cash Rate~4.10% p.a.
Variable Home Loan (avg)6.00–6.50% p.a.
3-year Fixed Home Loan5.80–6.20% p.a.
Personal Loan (unsecured)7.99–19.99% p.a.
Car Loan (secured)5.99–8.99% p.a.
Term Deposit (12-month)4.50–5.10% p.a.
High-Interest Savings4.50–5.50% p.a.

Indicative rates only. Always compare using the comparison rate.

Understanding Interest Rates in Australia

Interest rates in Australia are influenced by the RBA cash rate and lender credit risk assessments. They come in many forms: advertised rates, comparison rates, nominal rates, and effective rates.

Comparison Rate

The comparison rate combines the interest rate with most fees and charges into a single annual percentage, making true cost comparisons easier. In Australia, lenders must display the comparison rate alongside the advertised rate for loans above $2,000.

Nominal vs Effective Rate

A nominal rate of 6% p.a. compounding monthly produces an effective annual rate (EAR) of (1 + 0.06/12)^12 − 1 = 6.168%. The EAR reflects the true annual cost of borrowing.

Variable vs Fixed Rates

Variable rates move with market conditions (usually following RBA decisions). Fixed rates are locked for a set period (1–5 years). Fixed loans may charge significant break costs if you repay early or refinance.