Compound Interest Calculator

A compound interest calculator is a free online tool that estimates how your savings or investments grow over time by earning interest on both the original principal and previously earned interest. Simply enter your initial investment, interest rate, compounding frequency, and investment period to calculate your future value.

The standard compound interest formula is: A = P (1 + r/n)^(nt) Where: A = Final amount P = Principal (initial investment) r = Annual interest rate n = Number of times interest is compounded per year t = Number of years Our calculator automatically applies this formula, so you don't need to calculate it manually.

Simple interest is calculated only on the original principal amount, while compound interest is calculated on both the principal and the accumulated interest. Because of this, compound interest typically generates higher returns over time, especially for long-term investments.

The more frequently interest is compounded (daily, monthly, quarterly, or annually), the faster your investment grows. Daily compounding generally earns slightly more than monthly or annual compounding because interest is added more often.

Yes. This calculator is ideal for estimating the future value of savings, fixed deposits, mutual funds, retirement investments, and other interest-bearing accounts. By adjusting the interest rate and investment period, you can also estimate approximately how long it may take for your money to double through compound interest.