Electrical Power Calculator

Calculate single-phase real electrical power with an entered power factor. Enter your own values below to see real electrical power and check the method behind it.

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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

Single-phase real power = RMS voltage × RMS current × power factor.

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What is Electrical Power Calculator?

Electrical Power Calculator helps you calculate single-phase real electrical power with an entered power factor.

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

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

Electrical Power Calculator: a worked example

With the inputs below, the result is 1,150 W (real electrical power). Follow the example, then replace these illustrative values with your own.

Example inputs and output
Input or outputExample value
Voltage (V)230 V
Current (A)5 A
Power factor (%)100 %
Real electrical power1,150 W

Understanding the Electrical Power result

The main output is real electrical power, expressed in W. 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.

Electrical 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.

Electrical Power Calculator FAQs

What does Electrical Power Calculator calculate?

Electrical Power Calculator helps you calculate single-phase real electrical power with an entered power factor. Its main output is real electrical power in W.

What inputs do I need for Electrical Power Calculator?

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

Which formula does Electrical Power Calculator use?

Single-phase real power = RMS voltage × RMS current × power factor.

What is a worked example for Electrical Power Calculator?

Example inputs: Voltage: 230 V; Current: 5 A; Power factor: 100 %. The result is 1,150 W (real electrical power).

How should I enter voltage?

Enter voltage in V, at least 0. Decimals are accepted.

How do I choose current?

Enter current in A, at least 0. Decimals are accepted. The example uses 5 A; replace it if your circumstances differ.

How should I read real electrical power?

The main output is real electrical power, expressed in W. It applies to the inputs and operation you selected.

Why might my Electrical 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 Electrical Power Calculator?

Yes. Note your first real electrical power, change 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 Electrical 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.