A self-calibrating apparatus comprises a primary device and a test structure fabricated on an integrated circuit chip. The primary device and the test structure have at least one unknown property due to a fabrication process of the integrated circuit chip. An electrical measurand sensor is configured to measure an electrical measurand of the test structure. A controller coupled to the primary device and electrical measurand sensor. The controller is configured to calculate the at least one unknown property of the test structure based on the measured electrical measurand and use the calculated at least one unknown property to calibrate the primary device.