A method of calculating a system power distribution network impedance is presented. The impedance calculation calculates the impedance as separate elements of the printed circuit board (PCB). An approximation of the power and ground via inductance of the printed circuit board is made based on the configuration of the printed circuit board. The decoupling capacitors of the PCB are modeled as a parallel combination of inductors, capacitors, and resistors, and the parallel combination is used to calculate the impedance. In addition to the impedance associated with the decoupling capacitors, the method calculates an inductance associated with a mounting orientation of the decoupling capacitors. The power and ground planes of the printed circuit board have an associated capacitance and inductance, which is calculated. The resultant simulated impedance profile illustrating the board configuration impedance over a frequency range is displayed.