Compound interest (or compounding interest) is interest calculated on the initial principal, which also includes all of the accumulated interest of previous periods of a deposit or loan. In other words, interest on interest. On this page you can calculate 4 variables of compound interest: Present value, Future value, interest rate and number of periods.

**Future Value:**

**Present Value:**

**Number of Periods:**

**Interest Rate:**

By César Alejandro Guerrero For SmartGigas.com