Compound Interest Calculator (free)

Before using our compound interest calculator, it might help to know what it is and why this important. If you’re already familiar with the concept, then feel free to scroll down to the calculator below.

Compound interest is a financial concept where the interest you earn or owe on a sum of money is added back to the original amount, thus increasing the total base amount on which future interest is calculated. This process can significantly boost growth over time, which is why it is often referred to as “interest on interest”. Compound interest can apply to various forms of investment and borrowing, such as savings accounts, loans, bonds, and more.

The rate at which compound interest accrues depends on several factors: the principal amount (the original sum of money), the interest rate, the frequency of compounding (how often the interest is calculated and added to the principal), and the length of time the money is invested or borrowed. The magic of compound interest lies in its exponential growth over time. The longer the time period and the higher the compounding frequency, the greater the impact of compound interest, leading to a significantly larger final sum.

How To Use Our Compound Interest Calculator


Enter the Required Details

Fill in the principal amount, annual interest rate, and the time period in years. The principal amount is the initial investment or current balance, the annual interest rate represents the growth rate of your investment, and the time period specifies how long your money will be invested.


Click "Calculate"

Once you've entered the necessary information, click the "Calculate" button. The calculator will process the data and compute the total interest earned on your investment.


Review the Results

The calculator will display the computed interest amount. This value represents the additional money generated by your investment over the specified time period. Take note that the principal amount is not included in this result.


Let's calculate that compound interest!

Compound Interest Calculator