Now we can calculate the yield for each possible call or put date. In addition, we can also calculate the yield to maturity. The lowest yield of all these possible yields is known as a yield to worst. For example, assume that the bond given above has five possible call dates; and yield to call for all these five possible dates are 6.58%, 6.18%, 5.98%, 5.48% and 5.28%. The yield to maturity for this bond is 8.30%. Then, the yield to worst will be 5.28%, because this is the lowest yield.