POWER FACTOR CALCULATOR

This calculation is done based on the general formula PF=P/S, where P - watts, S=V×I - volt-amperes.

However, a three-phase (3-PH) circuit requires an additional explanation. Generally, we have to add up "P" and "S" values from all phases, where S_PH=V_PH×I_PH. What complicate matters is that Wye configuration is usually referred to by its line-to-line voltage, which relates to phase voltage as following:
V_L-L= √3×V_PH. Conversely, for delta you usually know line current, which is I_LINE=√3×Iph. Fortunately, for balanced loads in both cases the total apparent power can be described by the same equation:
S=3×Vph×Iph=√3×V_L-L×I_L.

Therefore to avoid confusion and to use a common approach, for 3ph configuration our widget uses line voltages and currents- that's what you need to enter into respective fields for RMS volts and amps.

Here is the procedure for calculation of power factor:

Select 1PH or 3PH from the drop down menu;
Enter RMS values of current (in amps) and voltage (in volts);
Enter real power (watts)
Click Calculate button

For sizing of power factor correction capacitors, see our PFC capacitor sizing.

Circuit
RMS current (amps)
RMS voltage (volts)
Real power P (watts)

Power Factor