The strength of ice depends on many factors. If they are known, the strength can be predicted with an acceptable accuracy. When designing an offshore structure, a designer usually has to select appropriate values of ice strength from incomplete, uncertain and random observation data for the site-specific ice environment. In this paper, a simplified method of selecting such values is described. A reference value of compressive strength is presented as an analytical function of averaged site-specific environmental parameters and offshore structure dimensions which are usually available to the designer.