The viscocapillary model of slot coating is used to estimate the values of a key operating variable : the differential pressure that must be applied between the gas phases located upstream and downstream of the coating station. The results of this simple model are compared with the predictions of a finite element model that analyzes the system solving the two dimensional governing equations; these predictions are here considered as standards. Though the simple model overestimates the standard results, the relative errors are, in most of the cases, less than 50%. Since the viscocapillary model is easy to employ, it can be conveniently used to determine an upper bound of the differential pressure to be sustained by the coating bead.