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AC Apparent, Real & Reactive Power Calculator

S = V·I; P = S·cosφ; Q = S·sinφ — AC power triangle.

Calculates apparent power (VA), real power (W), reactive power (VAr), and power factor from voltage, current, and phase angle.

Marcus Laurent By Marcus Laurent
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

S = V×I; P = V×I×cosφ; Q = V×I×sinφ; pf = cosφ

In depth

Calculates apparent power (VA), real power (W), reactive power (VAr), and power factor from voltage, current, and phase angle.