Two types of permeation cells and measurement methods for determination of transport characteristics of porous solids were compared. The dynamic method is based on unsteady permeation of single gases in a porous medium. The pseudostationary method uses equilibration of a small gas pressure difference across the porous medium. For evaluation of data from the dynamic cell full and simplified solutions are formulated and compared. Transport parameters of the porous solid are obtained by nonlinear matching of data to theory. Both the full and simplified descriptions of the pressure transients give comparable transport characteristics. From the pseudostationary cell data the transport parameters are obtained by simple linear regression, again in good agreement with the dynamic method. In both cases it is possible to determine the significance of Knudsen and viscous gas transport mechanisms. Permeation measurements were performed with hydrogen, helium, nitrogen, and argon on one monodispersed and one bidispersed type of porous pellet.