An investment calculator projects the future value of a portfolio based on an initial lump sum, regular monthly contributions and an assumed annual rate of return. It compounds monthly, which is a common approximation for diversified investment portfolios. The result shows how much of the final balance comes from your contributions versus investment growth.

1. Enter your initial investment amount.
2. Enter your monthly contribution (or 0 for lump sum only).
3. Enter the expected annual return rate.
4. Enter the investment period in years.
5. Click Calculate.

$5,000 initial, $200/month, 8% p.a. over 20 years.
Future value ≈ $142,400 | Total contributions ≈ $53,000 | Growth ≈ $89,400

The growth figure represents the return generated by the investment above your total contributions. Over long periods, growth typically exceeds contributions significantly — this is the compounding effect. The assumed rate of return is the most sensitive variable; small changes have a large impact over 20+ years.

• Using overly optimistic return rates — historical long-term equity returns average 7–10% before inflation.
• Ignoring investment fees, which can reduce effective returns by 1–2% per year.
• Not accounting for tax on investment income and capital gains.

What return rate should I use?

Historical long-term equity market returns have averaged around 7–10% per year before inflation. For conservative estimates, many planners use 6–7%. Always use a rate appropriate to your specific investment type and risk tolerance.

Does this account for inflation?

No. To estimate real (inflation-adjusted) returns, subtract the expected inflation rate from your return rate before entering it. For example, if you expect 8% returns and 3% inflation, use 5% as your rate.

Can I use this for a superannuation or pension projection?

Yes, as a rough estimate. Enter your current balance as the initial investment, your regular contribution and an assumed return rate. Note that actual superannuation returns vary and fees apply.