A calibration system for a tensioning system (32) on a square baler (12) and method for such is disclosed. A first movement of a slack arm (44) of the tensioning system (32) may be identified (206). It may be determined that the slack arm has been maintained in a first calibration position for a first predetermined time interval (216), and a first calibration setting for the slack arm (44) may be determined based upon the first calibration position (220). A second movement of a slack arm (44) of the tensioning system (32) may be identified (226). It may be determined that the slack arm (44) has been maintained in a second calibration position for a second predetermined time interval (232), and a second calibration setting for the slack arm (44) may be determined based upon the identified second calibration position (236).
