A magnetic current sensor calibration system includes a plurality of sensors and a substrate. The substrate has a first surface and a second surface, and the sensors are mounted on the first surface. The substrate includes a bipolar calibration conductor and a unipolar calibration conductor. The bipolar calibration conductor is spaced apart from the plurality of sensors and is disposed between the first and second surfaces. The unipolar calibration conductor is spaced apart from the plurality of sensors and the bipolar calibration conductor, and is disposed between the first and second surfaces.