The focus of this chapter is the simple methods for predicting the pressure and temperatures at which hydrates will form. These methods are: (1) a chart based on the gas gravity, (2) a K-factor method, and (3) a chart method for sour gases (those contain hydrogen sulfide). This chapter discusses how to use these methods and the approximate error associated with them and their limitations. Algorithms are provided to simplify the approaches. Several examples are given that demonstrate the accuracy (or perhaps the inaccuracy) of these methods.