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Instant result
Enter the data and press the button to do the calculation.
Online Calculator
Apparent, active, and reactive power calculator
Enter RMS voltage, RMS current and power factor to calculate S, P, Q and phase angle.
Ideal single-phase model. The sign of Q depends on whether the load is inductive or capacitive.
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Local processing
The values are processed directly in your browser.
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Free
No registration, external API or subscription required.
Frequently asked questions
What is the apparent power?
It is S = V × I and is expressed in VA.
How do you get the active power?
P = S × power factor.
How do you get the reactive power?
Its magnitude can be calculated as |Q| = S√(1 - fp²).
Is this a single-phase calculation?
Yes, this tool uses the ideal single-phase model.