Compound InterestMoney GrowthInvestingMonthly ContribInterest RateFree CalculatorCompound InterestMoney GrowthInvestingMonthly ContribInterest RateFree Calculator

Compound
Interest

Initial + Monthly · Rate · Year-by-Year Growth

Your Numbers

Final Balance
Interest Earned
Total Deposited

The Power of Compound Interest

Start AgeMonthlyAt Age 65 (8%)
25 (40 yrs)$200$702,856
30 (35 yrs)$200$458,689
35 (30 yrs)$200$298,072
40 (25 yrs)$200$190,935
45 (20 yrs)$200$118,589

Starting 10 years earlier with the SAME monthly contribution results in 2-3x more money. Time is the most powerful variable.

Historical Average Returns

InvestmentAvg Annual ReturnRisk
S&P 500 Index10-12% (nominal)Moderate
Total Stock Market9-11%Moderate
Bonds4-6%Low
High-Yield Savings4-5% (2025)None
Real Estate8-12%Moderate
Crypto (BTC)Highly variableVery High

This calculator is for educational purposes. Past returns don't guarantee future results. Consult a financial advisor.