Abstract: Based on the relationship between the electrical resistivity and porosity from the octahedron model of porous materials, the practical investigations are carried out on the calculation of the electrical resistivity of a series of metal foam products. This paper looks into metal foam products with different material species and various structures, and develops a series of practical applications and verification of the present calculation formula. The results show this characterizing relation can well calculate not only the electrical resistivity of metal foams with different material species, but also that with various structures. This indicates the formula has a good practical ability to calculate the electrical resistivity of metal foams.