Enter an amount and a nominal annual interest rate. If you set the number of days to 0, the calculator will calculate them using the start and end date that you've set. If the number of days is not 0, the days will be added to the "Start Date" to calculate the "End Date". Set the compounding and the rate basis. Click "Calc". The interest will be calculated for the exact number of days. Additionally, the future value is calculated (Initial amount plus the interest.) The annual percentage yield is used for comparing investments. It is the rate institutions must quote in the US for interest bearing accounts. The holder of such an account can use the APY to compare accounts. Interest may be calculated based on a unit of time, say a month. In that case, a month's interest is always the same for the same interest rate and same principal balance regardless of the length of the month. Given $10,000 principal and an interest rate of 6.75% the interest will be the same for February as it will be March. There is also exact day interest. Interest is calculated based on the exact number of days. This calculator calculates exact day interest and the future value. This calculator also performs calendar math.

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