Compound Interest Calculator

See how your savings or investments grow over time with compound interest. Includes monthly contribution support.

Total Contributions $0
Total Interest Earned $0
Final Balance $0
YearContributionsInterestBalance

How Compound Interest Works

Compound interest is interest calculated on both the initial principal and the accumulated interest from previous periods. This creates a snowball effect where your money grows faster over time.

The formula is: A = P(1 + r/n)^(nt), where P is the principal, r is the annual rate, n is the compounding frequency, and t is the time in years. With monthly contributions, each deposit also earns compound interest from the date it's added.