Power Factor Calculator

Formula

PF = P ÷ S

PF

Power factor, between 0 and 1

P

Real power, in watts

S

Apparent power, in volt-amps

What this calculator does

Calculates power factor as the ratio of real power to apparent power.

Use cases

• Check whether a facility's power factor meets a utility's requirement
• Verify a nameplate power factor against measured real and apparent power
• Compare power factor before and after correction equipment is added

Related

• Open the Real Power Calculator →
• Open the Apparent Power Calculator →
• Read the Power Factor Formula →
• See Power Factor Examples →
• Read the What Is Power Factor Guide →
• Read the Power Triangle Formula →
• See Electrical Power Examples →
• Read the Electrical Power Guide →
• Browse Power Factor category →