Calculate real power (Watts), apparent power (VA), and reactive power (VAR) for AC systems.
Load Parameters
Power Values
About this calculator
Overview
AC wattage isn't just Volts x Amps because of phase shifting between voltage and current. This calculator determines the Real Power (Watts) you actually pay for.
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Pro Tips
Real Power (W) is what performs work.
Apparent Power (VA) is used for sizing transformers and wires.
Reactive Power (VAR) is the 'wasted' power that cycles back and forth.
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Fun Facts
"Power factor is like the foam on a beer; the liquid is the real power, the foam is the reactive power, and the whole glass is the apparent power."
"Industrial users are often penalized by utilities for having a low power factor."
"AC power alternates its direction 50 or 60 times per second."
