Compound Interest Calculator
See how regular deposits and compounding grow your savings over time — or flip to goal mode to find the deposit you’d need to hit a target.
Balance after 10 years
$85,134
You put in
$65,000
Interest earned
$20,134
Balance over time
Make the rate work harder
The longer your money compounds, the more of the final balance is interest rather than your own deposits — which is why starting early matters more than starting big. The rate matters too: compare high-interest options on our savings account comparison, and watch the bonus-rate conditions so you actually earn the headline rate.
Saving for a fixed term with no withdrawals? A term deposit can lock in a rate — size up the interest with the term deposit calculator.
FAQs
What is compound interest?
Interest earned on both your savings and the interest already added. Each payment joins the balance and earns interest itself, so savings grow faster the longer they’re left.
How often does interest compound?
Most Australian savings accounts calculate interest daily and pay it monthly. This calculator compounds at your chosen deposit frequency, a close match for everyday savings.
Do bonus rates change the result?
Yes — many savers only pay the headline rate if you meet monthly conditions. Miss one and you earn the base rate that month. Use the rate you’ll realistically earn.
Is this calculator financial advice?
No — a general estimate using a constant rate and regular deposits, ignoring tax on interest and any fees. Your actual return will differ. Confirm with your bank.
Estimates only, for general information. Assumes a constant interest rate with deposits and compounding at the chosen frequency, and excludes tax on interest and account fees. Not financial advice — confirm figures with your bank.