Compound Interest Calculator

Compounding is at the core of long-term investing. The calculator simulates monthly contributions with multiple compounding frequencies (monthly / quarterly / semi-annually / annually) and outputs ending balance, total invested and interest earned.

Compound Interest Calculator

Initial principal (AUD)

Monthly contribution (AUD)

Annual rate (%)

Investment period (years)

Compounding frequency

Compounding is at the core of long-term investing. Results exclude tax and inflation.

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'+t(n)+'

Ending balance after '+l+" years

Initial principal	"+t(i)+"
Contributions	"+t(a)+"
Total invested	"+t(o)+"
Interest earned	"+t(c)+"
Final balance	"+t(n)+"

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How to use

Results refresh as you edit the fields — no need to press Calculate. Adjust any input to test alternative scenarios.

Notes

Results exclude tax, fees and inflation; real-world returns vary with the market.

Compound Interest Calculator