Three-Phase Power Calculator
Fill in the values and the answer updates as you type.
How the Three-Phase Power Calculator works
Apparent power = √3 × line voltage × line current ÷ 1000. Real power = apparent power × power factor. Use the line-to-line voltage (400 V in most of the world, 208 or 480 V in North America). Example: with the default values, real power comes to 18.84 kW.
Inputs and results
The Three-Phase Power Calculator takes 3 inputs and gives 3 results.
What you enter
- Line-to-line voltage (V) — starts at 400.
- Line current (A) — starts at 32.
- Power factor — starts at 0.85.
What you get
- Real power (kW)
- Apparent power (kVA)
- Reactive power (kVAR)
Example: Three-Phase Power Calculator with the starting values
With line-to-line voltage 400 V, line current 32 A and power factor 0.85, the calculator returns:
| Real power (kW) | 18.84 |
|---|---|
| Apparent power (kVA) | 22.17 |
| Reactive power (kVAR) | 11.68 |
Change any value above and the results update straight away.
Three-Phase Power Calculator FAQ
How do I use the Three-Phase Power Calculator?
Enter line-to-line voltage, line current and power factor in the fields, then read real power (kw), apparent power (kva) and reactive power (kvar) in the result panel. The answer updates as you type, and you can press Calculate or Enter to refresh it. Use “Copy link” to share your exact numbers with someone else.
What does the Three-Phase Power Calculator calculate?
Power in kW and kVA for a three-phase supply. It returns real power (kw), apparent power (kva) and reactive power (kvar) from the 3 values you provide.
What values does the Three-Phase Power Calculator start with?
It opens with line-to-line voltage 400 V, line current 32 A and power factor 0.85 so you can see a working result straight away. Replace them with your own numbers, or press Reset to return to these starting values.
Is the Three-Phase Power Calculator free and private?
Yes. It is free, needs no account, and runs in your browser, so nothing you type is sent to or stored on our servers. See the Privacy Policy for details.
Can I rely on the Three-Phase Power Calculator for important decisions?
Treat the result as a well-rounded estimate. Real situations often have details a general calculator cannot know, so confirm important decisions with a qualified professional. See the Disclaimer for more.