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💰 Investment

Compound Interest Calculator

See how your money grows with compound interest over time. Perfect for planning investments and savings.

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yrs
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Final Balance
$0
Total Interest Earned
$0
Total Contributions
$0
Return on Investment
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About This Compound Interest Calculator

This compound interest calculator shows how savings or investments grow when you earn interest on your interest, not just on your original deposit. Enter your starting amount, regular contributions, interest rate and time, and see the balance build over the years.

This is general information only and not financial advice. Compounding rewards starting early and staying invested. Real returns vary, and fees and tax reduce the final figure.

Frequently Asked Questions

What is compound interest?+
It's interest earned on both your original money and the interest already added. Over time this snowballs, so growth accelerates the longer you stay invested.
How does compounding frequency matter?+
More frequent compounding (monthly vs yearly) slightly increases growth. The bigger drivers are the rate, the amount and, above all, time.
What is the rule of 72?+
Divide 72 by your annual return to roughly estimate the years it takes to double your money. At 7%, that's about 10 years.

Related Tools

→ Future Value→ Savings Calculator→ Investment Return

RELATED GUIDE

Compound Interest: How Your Money Grows on Itself

A plain-English guide to compound interest: how it differs from simple interest, the formula, the Rule of 72, and why starting early matters so much.

Read the full guide →