The straight value of a convertible bond is nothing but the value of a non-convertible bond having same characteristics. For example, assume that a company has two types of bond issues outstanding in the market having a same coupon rate: a convertible bond issue and a non-convertible bond issue. The market price of the convertible and non-convertible bonds is Rs.190 and Rs.150 respectively. Thus, the straight value of the convertible bond is Rs.150. Investors are willing to pay a premium of Rs.40 - the privilege of being able to convert the bond into common shares.