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Electrical

Reactive Power Calculator

Find reactive power magnitude from apparent power and power factor.

Ideal component relationshipsUnits and assumptions explained below

Circuit parameters

Runs on your device

CIRCUIT RESULT

Your result

Let’s calculate.

Use the Calculate button to see your result.

Review the method below for assumptions and conventions.

How to use this tool

  1. Enter apparent power, power factor.
  2. Select Calculate to view the result.
  3. Check the method and assumptions below before using the result.

The method, explained

Reactive power magnitude = apparent power × √(1 − power factor²).

A WORKED EXAMPLE

Using apparent power = 1000 VA, power factor = 0.8, the result is 600 var. Change these example inputs to match your task; use the method above to check each step.

What to keep in mind

Ideal-component calculation for study and estimation. It does not select safe wiring, protective devices or component ratings for an installation.

Common questions

Which inputs does this calculation need?

Find reactive power magnitude from apparent power and power factor. Enter apparent power in VA, power factor. The filled example is editable and is not a saved personal record.

How should I interpret the result?

Ideal-component calculation for study and estimation. It does not select safe wiring, protective devices or component ratings for an installation.

Methodology maintained by ClarityKit. How these tools are built and checked.