Math & Numbers
Compound Interest Calculator
Calculate how your investment grows with compound interest over time.
See how your money grows with compound interest. Enter your principal, interest rate, compounding frequency, and time period to instantly see the final balance, total interest earned, and a year-by-year growth breakdown.
Features
Multiple Compounding Periods
Daily, monthly, quarterly, or annual compounding.
Year-by-Year Table
See exactly how your balance grows each year.
Regular Contributions
Add monthly or annual contributions to your calculation.
Instant Results
Totals update as you adjust any input.
How to Use
- Enter the principal (starting amount).
- Set the annual interest rate.
- Choose compounding frequency and time period.
- See the final balance and total interest instantly.
FAQ
What is compound interest?▾
Compound interest is interest calculated on both the initial principal and the accumulated interest from previous periods — making your money grow exponentially over time.
How often should I compound?▾
More frequent compounding (daily > monthly > annually) yields slightly more interest. The difference is meaningful over long periods.
The Power of Compounding
- $10,000 at 7% annual for 30 years = ~$76,123 with annual compounding.
- Starting early matters most — time is the biggest factor in compound growth.
- Einstein reportedly called compound interest the 'eighth wonder of the world.'
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