Compound Interest Calculator

See how your money grows over time. Enter your investment details below and watch compound interest work its magic.

Initial Investment

Monthly Contribution

Annual Interest Rate

Time Period

years

Compounding Frequency

Future Value

$145,180

Total Contributions

$58,000

Total Interest Earned

$87,180

Investment Growth Over Time

Get your PDF breakdown

Download a detailed report showing how your $145,180 grows year by year.

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Year-by-Year Breakdown

Year	Balance	Year Contributions	Year Interest	Total Interest
1	$13,216	$2,400	$816	$816
2	$16,664	$2,400	$1,048	$1,864
3	$20,362	$2,400	$1,298	$3,162
4	$24,327	$2,400	$1,565	$4,727
5	$28,578	$2,400	$1,852	$6,578

What is Compound Interest?

Compound interest is the interest calculated on the initial principal and also on the accumulated interest from previous periods. It's often called "interest on interest" and is the reason why investing early can have such a powerful impact on your wealth.

How to Use This Calculator

Enter your initial investment amount, any monthly contributions you plan to make, the expected annual interest rate, and the number of years you plan to invest. The calculator will show you the future value of your investment, broken down into contributions and interest earned, along with an interactive growth chart.

The Power of Starting Early

Thanks to compound interest, even small amounts invested early can grow significantly over time. For example, investing $10,000 at 7% annual return for 30 years results in over $81,000 — and that's without any additional contributions. Add $200 per month in contributions and you could end up with over $325,000.