Equivalent conductivity method is an approach for analyzing metasurface-based structures, which relies on the derivation of equivalent conductivity containing the properties such as the geometry, periodicity, and the surrounding materials. Using this approach, one can calculate the equivalent conductivity for a single metasurface layer and then consider it in further analysis of multilayer structures. When the particles of metasurface play dipole role, one can describe the polarizability of them by a Lorentzian line shape. Then, Equivalent conductivity of the metasurface can be derived by considering the calculated polarizability. This analytical method can be extended to the multi-spectral inhomogeneous metasurfaces with various components. There is no spectral limitation in the proposed approach, and it can be used for design and analysis of devices based on homogeneous and inhomogeneous metasurfaces in any frequency range. Because of interesting properties of graphene, description of this method is made by considering an array of graphene nanodisks as a metasurface. Also, absorbers and cloaking structures consisting of homogeneous and inhomogeneous metasurfaces are designed as the examples of this method applications.