[en] A simple and fast numerical method to evaluate the absorbed energy and power density on the divertor plates of ASDEX and ASDEX-Upgrade is described in this paper. Inertial cooled plates in the Divertor I of ASDEX as well as water-cooled plates in ASDEX-Upgrade and in the Divertor II of ASDEX are considered. In either case the temperature distribution on the surface of a representative divertor plate has to be measured with an appropriate space and time resolution as an input for the numerical computation. The time evolution of the profile of the surface temperature is determined with standard infrared measuring technique (orig./KP)