A method is provided for calculating characteristic geometrical or control variables of a three-point hitch for an agricultural tractor in which the hitch includes a lifting strut having a mounting position which is adjustable by means of a lifting arm in one of a plurality of receiving holes formed in a lower link and the hitch is pivotable by the lifting strut. The method includes moving the lower link initially into a horizontal angle position α=0 and capturing the corresponding angular position Px, Pz of the lifting arm and a corresponding angular position γ of the lifting strut relative to the vertical. The method further includes determining which of the receiving holes satisfies a geometrical constraint condition and determining the mounting position of the lifting strut on the lower link.
