Investment Calculator – Compound Interest Online Free

Calculate how your money grows over time with compound interest. 100% free · Works instantly in your browser · No data sent anywhere.

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Total Invested Amount:

$15,000

Final Balance After 10 Years:

$27,184.58

Total Interest Earned: $12,184.58

All calculations happen in your browser – 100% private

How to Use the Investment Calculator (3 Steps)

  1. Enter your initial investment and monthly contributions
  2. Set expected annual return rate and time period
  3. See instant results – how much your money will grow!

Frequently Asked Questions

Is this calculator free?

Yes – completely free, unlimited use, no signup required.

Do you store my data?

No. Everything runs in your browser. Nothing is uploaded or saved.

What’s a realistic return rate?

Historically, stock market returns ~7–10% annually after inflation.