How do you calculate interest on a bond?

To calculate interest on a bond, you need to know the bond's face value (or par value), the coupon rate, and the frequency of interest payments. The interest, or coupon payment, is determined by multiplying the bond's face value by the coupon rate and then dividing by the number of payment periods per year. For example, if a bond has a face value of $1,000 and a coupon rate of 5%, the annual interest would be $50, or $25 if paid semi-annually.