We summarize and extend our previous study of multilayer film adsorption on planar surfaces. The density profile of the adsorbed film is studied by a mean-field approximation. This leads to a self-consistent potential and a correction in thickness prediction to the result of Lifshitz and co-workers. The correction is determined by the van der Waals interaction and film compressibility and is found to be important for He films. A simple model is presented also for the physisorption isotherm inside a cylindrical pore. Comparisons with experimental data are provided.