You need the beginning value interest rate and number of periods in years. Doing so will calculate the amount that youll have to pay in interest for each period. The formula for calculating compound interest is.
The interest rate and.
The interest rate and number. How much will your investment be worth after 15 years at an annual interest rate of 4 compounded quarterly. This doesnt give you the compounded interest which generally gets lower as the amount you pay decreases. One of the easiest ways is to apply the formula.