📈 Compound Interest Calculator

See how your investments grow over time

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Final Portfolio Value
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Total Invested
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Interest Earned
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Inflation-Adjusted Value

About Compound Interest

Compound interest is interest calculated on both the initial principal and all previously accumulated interest. Einstein reportedly called it the "eighth wonder of the world" — the longer your money compounds, the faster it grows.

Starting earlier makes a massive difference: $500/month from age 25 at 7% grows to ~$1.3M by 65. Starting at 35 with the same contributions reaches only ~$600K — half the amount for the same monthly investment.

Projections are estimates based on a constant rate of return. Actual investment returns vary and past performance does not guarantee future results.