# POWER FACTOR CALCULATOR

This calculation is done based on the general formula

**PF=P/S**, where

**S=V×I**.

A 3ph circuit requires an explanation. Generally, we have to add up "P" and "S" values from all phases, where

**Sph=Vph×Iph**. What complicates matters is that Wye configuration is usually referred to by its line-to-line voltage, which is

**V**_{L-L}= √3×Vph. 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 volts and amps. For sizing of power factor correction capacitors, see our

PFC caps widget.