The invention relates to a computer-aided simulation tool, in particular to computer-aided simulation methods, for providing assistance in the planning of thermotherapy, and to suitably configured computer equipment. The thermotherapy comprises hyperthermic treatment of a tumour volume within a volume of a human body. The hyperthermic treatment comprises the application of a magnetic field within a treatment volume by means of a magnetic field applicator. In at least one depot volume, thermal energy can be introduced by means of magnetic, paramagnetic and/or superparamagnetic nanoparticles deposited in the body, by power absorption in the applied magnetic field. Field strength values and optionally calculated temperature distributions are provided for assisting the user in the planning of the thermotherapy.