VA to Watts Calculator
Convert volt-amperes to watts using power factor.
VA to Watts Formula
Watts = VA × power factor.
What Is the Difference Between VA and Watts?
Volt-amperes measure apparent power, while watts measure real power actually converted into useful work or heat. Power factor links the two values in AC systems.
Example Calculation
A 1,500 VA load with a power factor of 0.8 uses 1,500 × 0.8 = 1,200 W of real power.
Factors and Interpretation
When power factor is 1, VA and watts are equal. Lower power factor means the same apparent power corresponds to fewer real watts. This calculation assumes the entered power factor already represents the load’s overall AC behavior.
Frequently Asked Questions
Are VA and watts always the same?
No. They are equal only when power factor is 1.
Can power factor be above 1?
No. Enter a value from 0 to 1.
Why do UPS systems often use VA ratings?
VA describes the apparent electrical load the equipment must support, independent of the load’s exact power factor.
Related Tools
Formula and Practical Limits
Apparent power in volt-amperes and real power in watts are related through power factor for AC loads. Watts = VA × power factor in the simple case; non-sinusoidal loads and multi-phase systems can require additional context.