Informational purposes only, not financial advice — always do your own research. See our full legal disclosure for details.

Compound Interest Calculator: See Your Money Grow Fast

Compound interest earns returns on your returns, and time does the heavy lifting. Enter your numbers below and see how your money could grow.

Understand the Math Behind Your Results

Our complete compound interest guide explains how compound interest works, the compound interest formula and why compounding frequency matters. It also covers how taxes, fees and inflation reduce your real returns, and how the same math works against you with debt.

See Real Scenarios and Strategies

Our practical compound interest examples show what monthly deposits, higher rates and an earlier start can do. Use them with our investment calculator and savings calculator to test your own plan.

Six People, Six Compounding Stories

Starting at 22 or at 45 leads to very different outcomes. Read how six people used compounding. Each has a dedicated page showing their situation, their problems and what their numbers revealed.

Results are estimates, not guarantees. Browse all compound interest articles below.

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This article is for informational purposes only and does not constitute financial advice. We may receive compensation from our partners when you click on links or apply for products featured here; this does not influence our editorial opinions or ratings. For complete terms, see our full legal disclosure.