The article presents the calculation of material balances for methane-hydrogen, propane-propylene, butylene-divinyl and isobutylene regions of the chemical-technological complex. For calculation of the material balances the regime technological parameters for the each process entering into the regions have been taken from the operational industrial chemical-technological processes and the processes which are under the development. Has been given the final results of the calculation of the material balance of the chemical technological complex, in which presents the amounts of pyrolysis and cracking gases entering into the complex and the amounts of all the target products coming out of it.