True power factor with harmonic current calculator

True real-to-apparent power factor is calculated as DPF / sqrt(1 + THD_I²). Use the stated system boundary and matching input units.

\mathrm{PF}_{\text{true}} = \frac{\mathrm{DPF}}{\sqrt{1 + \mathrm{THD}_{I}^{2}}}

Calculator

Enter the values you know and leave one box empty. Calculate finds the empty one, the result or any input.

Given

\mathrm{PF}_{\text{true}} = \frac{0.95}{\sqrt{1 + {0.5}^{2}}} \approx 0.8497

Symbol	Meaning	Unit
$\mathrm{PF}_{\text{true}}$	true real-to-apparent power factor	—
$\mathrm{DPF}$	fundamental displacement power factor	—
$\mathrm{THD}_{I}$	harmonic rms current divided by fundamental rms current	—

Results are estimates for study and screening. Check the inputs, units and assumptions before you use them for design, billing or contract decisions.