To get the total number of payment periods we multiply it by 12. If the interest on your investment is paid monthly while being quoted as an annual interest rate the Excel compound interest formula becomes. In our example the formula is A2 1B2 where A2 is your initial deposit and B2 is the annual interest rate.
For this go to that cell and press Ctrl1 or right click to select Format Cells.
To get the total number of payment periods we multiply it by 12. In the example shown the formula in C10 is. NPER stands for the total number of compounding periods it equals the product of total number of years and number of compounding periods per year. The formula now becomes.