Compound Interest Calculator

See how your money grows over time with the power of compound interest and regular contributions.

The amount you're starting with today
Additional amount added each month
Historical S&P 500 average: ~10% before inflation
Final Balance
Total Contributions
Total Interest Earned
Total Gain
Rule of 72: At {rate}% annual rate, your money doubles every {72/rate} years. Try changing the rate to see the impact!

What Is Compound Interest?

Compound interest is interest earned on both your original investment and on the interest that has already been added to it. This creates a snowball effect where your money grows faster over time. The earlier you start investing, the more powerful compound interest becomes. For example, at 7% annual return, your money doubles about every 10.3 years.

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