Abstract: Based on the equation from the octahedron model to conveniently calculate the specific surface area of porous materials, the practical investigations are correspondingly carried out on a series of metal foam products. This paper investigates more metal foam products with different material species and various structures and develops a series of practical applications and verification of the present calculation formula. Among the investigated objects, there are highly porous products with porosity exceeding 90%, lowly porous products with porosity below 45%, and intermediately porous products with porosity between 70% and 80%. The pore sizes involved include both millimeter and micrometer scales. The research results show that the characterization formula of specific surface area can adapt well to the calculation of all these porous products, with the average calculation deviation within 3%, mostly around 1%. This indicates that this characterization formula well reflects the relationship between the specific surface area and the porosity and pore diameter for metal foams and the relevant porous product, and has a good practical ability to calculate the specific surface area of metal foams and the relevant porous product.