Power Factor Calculator
Convert between real power and apparent power using a power factor.
Calculate
Enter your values below.
Result
Result
0
Formula used
Real power (W) = Apparent power (VA) × Power factor
Example: 1,000 VA at a power factor of 0.9 → real power = 900 W.
How to use this calculator
- Enter Known power value (W or VA), Power factor (0-1).
- Choose Direction.
- Press Calculate to see your result instantly.
FAQ
Frequently asked questions
What is power factor?
A measure (0 to 1) of how effectively electrical power is converted into useful work — lower values mean more wasted apparent power.
What is apparent power measured in?
Volt-amps (VA), as opposed to real power which is measured in watts (W).
What is a 'good' power factor?
Closer to 1.0 is better — many utilities penalize industrial customers for low power factor.
Why does this matter for equipment sizing?
Generators and UPS systems are often rated in VA, so knowing the power factor helps size them correctly for a given real-power load.