Abstract: The present disclosure relates to a method for the automatic determination of the geometrical dimensions of a tool having a machining region in worm thread form, in particular of a grinding worm, wherein in the method: a measurement element is directed to the tool for the detection of a distance, the tool is set into rotation with respect to the measurement element, and a conclusion is drawn on the geometry of the tool on the basis of distance values that were detected by the measurement element during the rotation of the tool.