Compound interest is the interest recieved from an investment that then reinvests that interest into the original investment. It is the accumulation of interest on the original investment plus the interest gained. The formula for compound interest is:

Where A represents the final amount, P represents the initial amount, r represents the rate of interest in decimal, n represents the compounding of the interest per year, and t represents the time in years.

To get started, input the feilds below, then click "Calculate". Every time you do this, the interest is recalculated and displayed. Note: Don't insert commas or any other symbols with your numbers.