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Compound Interest Calculator

See how your money grows with compound interest over time.

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📈 Investing

How to use this calculator

At 8% annual return, money doubles roughly every 9 years.
Starting 10 years earlier can double your final balance even with smaller contributions.
The S&P 500 has averaged about 10% annual return historically (7% after inflation).
Reinvesting dividends is a form of compounding most people overlook.

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