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Australia compound interest calculator

Project how savings or investments can grow with compound interest and optional regular contributions. Choose monthly, quarterly, or annual compounding to match your account.

Currency AUD · Locale en-AU · Figures formatted for Australia

Added each compounding period.

Results

Future value
$17,175.24
Total contributions
$13,000.00
Interest earned
$4,175.24

How this calculator works

  • Starting balance grows at the chosen compounding frequency.
  • Regular contributions are added each period (end of period by default).
  • Total interest = future value − (starting balance + all contributions).
  • Taxes, fees, and inflation are not deducted.

FV = P(1+r)^n + PMT × ((1+r)^n − 1) / r, where r is the rate per period and n is the number of periods. If r = 0, FV = P + PMT × n.

Worked example

Save 100 per month for 1 year at 12% annual interest, compounded monthly, starting from zero.

Inputs

  • Principal0
  • Contribution100 / month
  • Rate12%
  • Years1

Results

  • Future value≈ 1,268.25
  • Contributions1,200
  • Interest earned≈ 68.25

Frequently asked questions

What compounding frequency should I pick?

Match your product: many savings accounts compound monthly; some bonds annually. If unsure, monthly is a common default for cash savings.

Are contributions at the start or end of each period?

This calculator defaults to end-of-period contributions (ordinary annuity). Beginning-of-period deposits earn slightly more interest.

Does this account for tax on interest?

No. Tax treatment varies by country and account type (e.g. ISA, 401(k), TFSA). Use after-tax rates only if you already know them.

Can returns go down?

This model assumes a constant positive rate. Investment markets can fall; treat the result as an illustration, not a forecast.

Sources and disclaimer

  • Compound interest and ordinary annuity future-value formulas

Estimates only — not financial advice. Results ignore fees, taxes on interest, early repayment charges, and product-specific rules. Verify with your lender or a qualified adviser.

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