A method for predicting the yield of unsaturated hydrocarbons during pyrolysis of individual alkane hydrocarbons and mixed hydrocarbons based on the conducted research and on literature data for pyrolysis of various hydrocarbon feedstocks was developed. The proposed method is universal for any type of feedstock and allows the maximum possible yield of target pyrolysis products to be pre-evaluated both before starting of experimental research and during industrial operation of pyrolysis plants.