3-Phase Power Calculator

Calculate balanced three-phase real power from line voltage and current. Enter your own values below to see three-phase real power and check the method behind it.

All calculators

Your inputs

Change the example values to match your situation.

Your result

Let’s work it out.

Fill in your inputs and select Calculate.
Your result and breakdown will appear here.

How this calculator works

Balanced three-phase power = √3 × line-to-line voltage × line current × power factor.

KEEP EXPLORING

View category
Ohm’s Law CalculatorElectrical Power CalculatorVoltage Drop CalculatorCurrent CalculatorResistance CalculatorWatt to Amp Calculator

What is 3-Phase Power Calculator?

3-Phase Power Calculator helps you calculate balanced three-phase real power from line voltage and current.

The main result is three-phase real power. The formula, example and assumptions below explain how to interpret it.

How to use 3-Phase Power Calculator

Use the example to get familiar with the form, then enter your own figures. Any rates in the example are illustrative. Check the field labels and units before calculating.

  1. Gather line-to-line RMS voltage (V), line current (A) and power factor (%). Use values from the same situation or reporting period.
  2. Replace the example line-to-line RMS voltage with your own value, then complete the other fields. Check the displayed units.
  3. Select Calculate and read three-phase real power. Change one input and calculate again to compare a second scenario. Reset restores the original example.
  • Enter line-to-line RMS voltage in V, at least 0. Decimals are accepted.
  • Enter line current in A, at least 0. Decimals are accepted.
  • Enter power factor in %, at least 0 and at most 100. Decimals are accepted.

3-Phase Power Calculator: a worked example

With the inputs below, the result is 12.93842 kW (three-phase real power). Follow the example, then replace these illustrative values with your own.

Example inputs and output
Input or outputExample value
Line-to-line RMS voltage (V)415 V
Line current (A)20 A
Power factor (%)90 %
Three-phase real power12.93842 kW

Understanding the 3-Phase Power result

The main output is three-phase real power, expressed in kW. It applies to the inputs and operation you selected.

Displayed results use a readable number of decimal places. When checking a result by hand, keep extra precision until the last step. To compare scenarios, change one input at a time and keep the others fixed.

3-Phase Power Calculator: assumptions and common mistakes

A useful estimate starts with the right inputs. Check the following assumptions and limits before applying the result to your situation.

  • DC, single-phase and three-phase calculations use different relationships. Equipment selection also depends on installation conditions and applicable standards.

For wider guidance, visit Bureau of Indian Standards. The formula and scope of this specific tool are stated on this page.

3-Phase Power Calculator FAQs

What does 3-Phase Power Calculator calculate?

3-Phase Power Calculator helps you calculate balanced three-phase real power from line voltage and current. Its main output is three-phase real power in kW.

What inputs do I need for 3-Phase Power Calculator?

You need line-to-line RMS voltage (V), line current (A) and power factor (%). Use the field labels and units to match your figures to the formula.

Which formula does 3-Phase Power Calculator use?

Balanced three-phase power = √3 × line-to-line voltage × line current × power factor.

What is a worked example for 3-Phase Power Calculator?

Example inputs: Line-to-line RMS voltage: 415 V; Line current: 20 A; Power factor: 90 %. The result is 12.93842 kW (three-phase real power).

How should I enter line-to-line RMS voltage?

Enter line-to-line RMS voltage in V, at least 0. Decimals are accepted.

How do I choose line current?

Enter line current in A, at least 0. Decimals are accepted. The example uses 20 A; replace it if your circumstances differ.

How should I read three-phase real power?

The main output is three-phase real power, expressed in kW. It applies to the inputs and operation you selected.

Why might my 3-Phase Power Calculator result differ from my records?

DC, single-phase and three-phase calculations use different relationships. Equipment selection also depends on installation conditions and applicable standards. Differences in entered values, units or rounding can also change the comparison.

Can I compare two scenarios in 3-Phase Power Calculator?

Yes. Note your first three-phase real power, change line-to-line RMS voltage or another input, and select Calculate again. Editing a field clears the old result so it is not mistaken for a new calculation.

Is 3-Phase Power Calculator free, and where are my inputs calculated?

This calculator is free to use without signing in. Its formula runs in your browser; calculator inputs are not sent to a calculation API. The inputs reset to the example values when you reset the form or start a fresh page.