Watch your money grow over time with compound interest
What is this? Compound interest is interest on interest — the most powerful force in personal finance. Einstein allegedly called it the 8th wonder of the world. This calculator shows exactly how your money grows with regular contributions, and how inflation erodes real purchasing power.
The rule of 72: Divide 72 by your interest rate to estimate how many years to double your money. At 7% return, money doubles every ~10.3 years.
Who it's for: Anyone saving for retirement, a house, education, or any long-term financial goal.
Starting & Contributions
Growth Results
Total Contributed
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Interest Earned
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Final Balance
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Real Value (Inflation-Adj.)
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Doubling Time
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Effective Annual Rate
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Year-by-Year Growth
🔗 Put This Math to Work in Real Estate
Compound interest works in real estate too — these tools help you put the math to work. We earn a commission when you sign up through our links — at no extra cost to you.