The paper presents an overview of methods and means of measuring parameters that characterize the efficiency of thermoelectric generators. The two most important parameters for evaluating the efficiency of thermoelectric generators are the conversion efficiency and thermoelectric quality factor. Despite the alleged simplicity of methods for measuring these parameters, their practical implementation is associated with significant difficulties, which makes it difficult to estimate the parameters of thermoelectric generators. The paper proposes a simple, according to the author, method for estimating the parameters of thermoelectric generators.