Compound Interest Calculator

Compound interest is the interest earned on initial principal and the accumulated interest from previous periods. It is also known as "compounding" interest, which is earning interest on interest. Use our compound interest calculator to determine how much money you can make given the (1) intitial principal, (2) monthly contribution (it can be zero), (3) expected rate of return (interest rate), and (4) compounding frequency (default 1 year).