Compound Interest Calculator Australia

Estimate how an initial deposit and regular monthly deposits may grow when returns are added to the balance.

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Estimated future balance

$0.00
Total deposits
$0.00
Estimated growth
$0.00

Returns are not guaranteed; fees, tax and inflation are not included.

What compound interest means

Compound interest means growth is earned on the starting money and on earlier growth already added to the balance. Regular deposits can also earn returns after they are added.

How to use it

  1. Enter a starting balance and monthly deposit.
  2. Add an estimated annual return and time period.
  3. Review the future balance, deposits and growth.
  4. Change the rate or time to test another scenario.

Worked example

Starting with $10,000, adding $500 a month and earning 5% a year for 10 years produces an estimated balance above $90,000. The result includes $70,000 deposited plus compound growth.

Benefits

  • Separates money contributed from growth.
  • Shows how time affects compounding.
  • Helps compare savings and investment scenarios.

Frequently asked questions

When are monthly deposits added?

This calculator treats deposits as being added at the end of each month.

Is the return guaranteed?

No. Savings rates and investment returns can change, and investments can lose value.

Does it include tax and fees?

No. Both can reduce the final balance.

What if the return is zero?

The result becomes the starting balance plus all regular deposits.

Conclusion

Compounding becomes more powerful with time and consistent deposits. Use several return assumptions rather than relying on one forecast.