Compound Interest Calculator
Calculate how an investment grows over time with compound interest — enter principal, rate, compounding frequency, and duration.
Examples
10,000 at 6% compounded monthly for 5 years
Principal: 10000, Rate: 6, Compounded: Monthly, Years: 5
Final Amount: 13488.50 Interest Earned: 3488.50
FAQ
No. All calculation happens locally in your browser.
How often interest is calculated and added to the principal each year — annually, semi-annually, quarterly, monthly, or daily. More frequent compounding yields slightly more growth for the same nominal rate.
A = P × (1 + r/n)^(n×t), where P is principal, r is the annual rate, n is the compounding frequency per year, and t is the number of years.
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Guide
Enter your principal, annual interest rate, how often it compounds, and the number of years. The final amount and total interest earned appear instantly.