Free tool · Compound interest, done right

See how your money grows over time.

Enter what you invest, how much you add each month, and the return you expect — and watch compounding do the heavy lifting. No spreadsheets required.

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8%
Typical market avg
< 10s
To your number
$0
Cost to use

Investment Returns Calculator

The power of compounding — on your exact numbers.

$
$
8%
1%Market avg ~8%15%
20 yrs
1 yr40 yrs
Your projected balance
$0
Total invested
$0
Growth earned
$0
Why it works

Compounding is the closest thing to magic.

Growth on growth

Your returns earn returns of their own. The longer you stay invested, the steeper the curve gets.

Time beats timing

Starting early matters more than picking the perfect moment. Consistency compounds.

Small adds, big impact

A modest monthly contribution, left alone for decades, can outgrow a large one-time deposit.

Questions

The honest answers.

What return rate should I use?+

The long-run average for a diversified stock market portfolio is roughly 7–10% before inflation. 8% is a reasonable middle-ground default. Use a lower number for a conservative estimate, and remember returns are never guaranteed year to year.

How is this calculated?+

It compounds monthly: each month your balance grows by the annual rate ÷ 12, then your monthly contribution is added. That's the standard future-value-of-a-series formula the pros use.

Does this account for inflation or taxes?+

No — it shows nominal growth before inflation and taxes. For a "real" spending-power number, subtract roughly 2–3% from your return rate. Tax treatment depends on the account (401k, IRA, brokerage).

Is this financial advice?+

No. It's an educational estimate to help you frame a decision. Your real results depend on markets, fees, taxes, and your behavior. Use it as a smart starting point, then adjust for your life.

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