A robot calibration system for calibrating a robot and a method of determining a position of the robot to calibrate the robot are disclosed. The system includes an electrical ground defining a return for an electrical circuit. The robot, which is electrically connected to the ground, includes an arm having a tool surface operating within a robot workspace. The system also includes an electrical supply and a detection device. The electrical supply defines a source for the circuit and provides a charge and a reference voltage to the system. The detection device communicates with the electrical supply to detect variations in either the charge, the reference voltage, or both. The system further includes a calibration object. The calibration object is electrically insulated from the ground and is electrically connected to the electrical supply. The calibration object receives the charge and the reference voltage from the electrical supply to determine the position of the robot relative to the calibration object when the tool surface moves toward the calibration object to electrically interact with the calibration object.