FINANCE · FREE TOOL
Compound interest calculator
Compare compound interest with your starting balance and chosen compounding frequency.
Your inputs
Enter your values, then calculate.
Decimal-point numbers; displayed rounding does not change internal values. Calculations stay on this device.
YOUR RESULT
Make the numbers clear.
Save calculation JSON ↓Calculation breakdown
Scroll sideways to see every column. You can also focus the table and use the arrow keys.
How this calculation works
A=P(1+r/m)^(m·years). Rate is nominal annual interest and m is periods per year. Fractional periods use fractional exponent growth, not a bank’s date-by-date crediting rules. No deposits, fees or tax.
Check the assumptions
Use one currency consistently; financial outputs use that same currency, except the U.S. tax tool specifically uses USD. Financial models use your assumptions, not live rates or personalized financial advice. Check the result against your contract or the applicable tax rules.