Method for calibration of vertical rollers of a vertical roll stand, which are each mounted in a vertical roller unit which is adjustable with respect to a predetermined centre line of a plurality of components arranged in a rolling train, comprising the following method steps: A) determining actual spacings of the longitudinal centre axes of the vertical rollers from the centre line of the rolling train in a predetermined operating setting, wherein the actual spacings are determined when there is no material present between the vertical rollers, B) providing at least one calibration slab with a known and defined width and introducing the calibration slab into the vertical roll stand, C) adjusting the vertical rollers against the calibration slab by a defined adjusting force while the calibration slab is led through the vertical roll stand and D) calculating target spacings of the longitudinal centre axes of the vertical rollers from the centre line of the rolling train in dependence on the actual spacings of the longitudinal centre axes of the vertical rollers from the centre line of the rolling train and the width of the calibration slab, characterised in that the method step A) comprises the following further method steps: a) adjusting the vertical roller units in a calibration setting transversely to the centre line of the rolling train against at least one stationary abutment, which has a defined known position with respect to the centre line, of the vertical roll stand, wherein the longitudinal centre axis of the vertical rollers in the calibration setting has a known and defined initial spacing from the centre line of the rolling train, and b) resetting the vertical roller units into a defined unloaded setting, and c) calculating the actual spacing of the longitudinal centre axis of the vertical rollers from the centre line of the rolling train from the sum of the initial spacing and the travelled path of the vertical roller units, which is measured during the resetting movement. A) determining actual spacings of the longitudinal centre axes of the vertical rollers from the centre line of the rolling train in a predetermined operating setting, wherein the actual spacings are determined when there is no material present between the vertical rollers, B) providing at least one calibration slab with a known and defined width and introducing the calibration slab into the vertical roll stand, C) adjusting the vertical rollers against the calibration slab by a defined adjusting force while the calibration slab is led through the vertical roll stand and D) calculating target spacings of the longitudinal centre axes of the vertical rollers from the centre line of the rolling train in dependence on the actual spacings of the longitudinal centre axes of the vertical rollers from the centre line of the rolling train and the width of the calibration slab, a) adjusting the vertical roller units in a calibration setting transversely to the centre line of the rolling train against at least one stationary abutment, which has a defined known position with respect to the centre line, of the vertical roll stand, wherein the longitudinal centre axis of the vertical rollers in the calibration setting has a known and defined initial spacing from the centre line of the rolling train, and b) resetting the vertical roller units into a defined unloaded setting, and c) calculating the actual spacing of the longitudinal centre axis of the vertical rollers from the centre line of the rolling train from the sum of the initial spacing and the travelled path of the vertical roller units, which is measured during the resetting movement.