Compound Interest Calculator

This calculator makes it easy for you to calculate compounding interest on your loans — or your investments. All you need to do is input the principal amount of the loan, the interest rate, and how frequently the loan is compounded.

If you’re trying to achieve a specific goal with your investments this calculator can also help you figure out what opening balance you’ll need to achieve your goals.

Our compound interest calculator can compound interest by varying intervals, from daily all the way up to annually. Calculations can be based on either a 360 day year or a 365 day year.

Compound Interest Calculator

(Hint: Enter the opening balance in the "Principal" box below to calculate what the compounded amount will be.)

(Hint: Enter the compounded amount in the "Principal" box below to calculate the opening balance you need to obtain your goal.)

Starting Principal:
Interest Rate:
Number of Days:
Compounding Period:
Effective Rate of Interest:
Compounded Rate of Return:
Compounded Amount:

By using this calculator you agree to terms and conditions. These calculators are designed to be informational and educational tools only, and when used alone, do not constitute investment or financial advice. We strongly recommend that you seek the advice of a financial services professional before making any type of investment or deciding on your financial matters. This model is provided as a rough approximation of future financial performance. The results presented by this calculator are hypothetical and may not reflect the actual growth of your own investments. We can't take into account potential lender fees, payoff schedule can be longer than in the estimation. Mycheckweb and its affiliates are not responsible for the consequences of any decisions or actions taken in reliance upon or as a result of the information provided by these tools. Mycheckweb is not responsible for any human or mechanical errors or omissions.