Compound Interest Calculator
See exactly how your savings or investments grow over time. Enter your principal, interest rate, and time period to calculate compound interest with a detailed year-by-year breakdown.
How to Use
Enter your initial investment (principal), the annual interest rate as a percentage, the number of years you plan to invest, and how many times the interest compounds per year. Common compounding frequencies are annually (1), semi-annually (2), quarterly (4), monthly (12), or daily (365). Click calculate to see your future value and a year-by-year growth breakdown.
Formula
Where A is the future value, P is the principal, r is the annual interest rate (decimal), n is the number of times interest compounds per year, and t is the number of years. For example, $10,000 at 7% compounded monthly for 10 years gives you $10,000 × (1 + 0.07/12)^(12×10) = $20,096.61.