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Alternative vehicle powertrains (hybrid, hydrogen, electric) are among the most interesting solutions for environmental problems afflicting urban areas. Electric and hybrid vehicles are now slowly taking place in the automotive sector, but on a Tank To Wheels (TTW) basis, the most effective alternative powertrain is surely represented by Fuel Cell Electric Vehicles (FCEV): those fuelled by hydrogen seem to be the ones closest to market. The design of a FCEV however, is not straightforward and involves several issues (fuel cell sizing, hydrogen storage, components efficiency, sizes and weights). Basing on these considerations, the Authors present a software procedure for the optimal design of the components of a passenger FCHEV (Fuel Cell Hybrid Electric Vehicle).