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Considering the difference between the bound atom in a molecule and the free atom, the original additivity rule is revised. Using the revised additivity rule, the total cross sections for electron scattering by ethylene (C 2 H 4 ), propene (C 3 H 6 ), butene (C 4 H 8 ), ethane (C 2 H 6 ), propane (C 3 H 8 ) and butane (C 4 H 10 ) are calculated over the energy range 10–1000 eV. The results of the revised additivity rule are compared with those obtained by experiments and the revised additivity rule can give better agreement with experimental values than the original additivity rule.