The guideline describes the calibration of torque sensors in achievement test stands with a reference measuring system. It is valid for achievement test system, where the torque is measured in the rotating shaft line. This guideline is valid for the gradual (static) and continuous (quasi-static) calibration of torque measuring systems in installed condition. Procedures are described for the calibration of the sensors integrated in the test system as well as given references to the determination of the uncertainty of measurement. Further references are given to the documentation of the results.