This paper presents a methodology for obtaining the parameters of the equivalent circuit for an induction motor from the information on the nameplate and manufacturer catalog data sheet. The proposed method is straight and noniterative. The variation in rotor parameters for deep bars or double squirrel-cage rotors is modeled and presented as a function of the slip. The results of remarkable points, such as the starting current, starting and breakdown torques, and rated conditions, are compared with the supplied data, and the comparison showed very good agreement. The methodology was applied to hundreds of motors. A statistical analysis is presented showing that the typical parameters of an equivalent circuit can be readily estimated in the absence of further data.