Motor Power Factor Calculator

How Motor Power Factor works

The stated formula is PF = kW ÷ kVA × 100. Motor Power Factor uses Real input power, Apparent input power to report Motor power factor.

With the loaded values, motor power factor evaluates to 78.57%. A second case makes the effect of one changed measurement visible.

Inputs for Motor Power Factor

Real input power and Apparent input power belong to Motor Power Factor. Keep source units with real input power.

No recommendation is implied by the loaded example. Use measurements from the intended scenario.

Real input power

Example entry: 11 kW.

Apparent input power

Example entry: 14 kVA.

Reading the Motor Power Factor result

This output represents Motor Power Factor.

The result informs selection but does not approve a component or installation.

Measurement and units

Motor nameplate data, duty, enclosure, starting method, load profile, and thermal limits govern final selection. Check prefixes on real input power.

Compare scenarios only when their measurement points and unit conventions match.

Limits of this calculation

Power factor varies with load. Compare this result with Motor Efficiency Calculator when motor efficiency is also needed.

Treat the formula as one part of the overall electrical analysis. Unentered effects remain outside Motor Power Factor.

A useful Motor Power Factor comparison

Record motor power factor before testing a different real input power value. For motor energy, use Motor Energy Consumption Calculator.

Document the alternate real input power source.

Motor Power Factor record notes

Record source and operating details for real input power. Use VFD Motor Speed Calculator.

Retain raw motor power factor beside its selected rating.

Questions about Motor Power Factor