The systems and methods of the present disclosure calibrate impedance loss model parameters associated with an electrosurgical system and compensate for impedance losses in an electrosurgical system using the calibrated impedance loss model parameters. A computer system stores voltage and current sensor data for different test loads and calculates impedance values for each test load. The computer system predicts a phase value for each test load using a respective load impedance value. The computer system back calculates impedance loss model parameters based upon the voltage and current sensor data, the predicted phase values, and the impedance values of the test loads. During operation, the electrosurgical device senses a voltage and a current, predicts a phase value based upon the sensed voltage and current, and calculates metrics at the tissue site based upon the sensed voltage and current, the predicted phase value, and the impedance loss model parameters.
