A compound interest calculator is a tool used to calculate the future value of an investment. The calculator takes the principal amount, the interest rate, and the number of years as input and calculates the future value of the investment. A compound interest calculator can help you to make an investment plan and achieve your future financial goals. For example, you can use a compound interest calculator to calculate the amount of money you need to save for retirement or the amount of money you need to save each month to pay for your child's college education. A compound interest calculator can also help you to understand the power of compound interest. Compound interest is the phenomenon of interest earning interest over time. Compound interest plays an important role in the long-term growth of investments. By using a compound interest calculator, you can understand the power of compound interest and make a plan to achieve your future financial goals.