Compound Interest Calculator
Calculate how your savings and investments grow with compound interest. See yearly breakdown with monthly contributions.
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Future Value
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Total Invested
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Interest Earned
Compound Interest FAQ
What is compound interest?
Compound interest is interest earned on both your initial principal AND previously earned interest. It's often called "interest on interest" and is the key to long-term wealth building.
How does compounding frequency affect returns?
More frequent compounding (monthly vs annually) results in slightly higher returns. The difference is small but adds up over decades.
What's the Rule of 72?
Divide 72 by your annual return rate to estimate how many years it takes to double your money. At 8% returns, your money doubles roughly every 9 years.