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Alternating Current

Three-Phase Power Calculator

Three-Phase Power Calculator is meant for one defined alternating current case. Run a separate case when the equipment, period, or connection changes.

Set up the Three-Phase Power case

Use one Three-Phase Power case at a time; save a new run when a condition changes.

V

Enter line voltage in V.

A

Enter line current in A.

Enter power factor.

The Three-Phase Power equation

P = √3 × VL × IL × PF

The formula uses Line voltage, Line current, and Power factor to produce Three-phase real power. Unit mistakes usually show up as an answer that is off by a factor of 10, 100, or 1,000.

Before entering line voltage

On Three-Phase Power, confirm decimal placement and unit scale before using three-phase real power; small prefixes can move an electrical result by orders of magnitude.

  • Line voltage. Example value: 400 V. Enter line voltage in V.
  • Line current. Example value: 32 A. Enter line current in A.
  • Power factor. Example value: 0.88. Enter power factor.

When line voltage is uncertain, run a low and high case instead of hiding that uncertainty in one entry.

Detail checks for three-phase real power

A simple result is easiest to misuse when the input source is not written down. Label power factor as measured, rated, assumed, or calculated before the answer leaves this page.

Confirm whether Three-Phase Power uses RMS, peak, or phase-referenced inputs before comparing the answer with another AC page.

  • Keep Power factor from the same equipment, period, or circuit.
  • Check the unit shown next to Power factor.
  • Save the baseline before testing a high or low case.
  • Do not round toward a limit; apply margin after calculation.

When three-phase real power is being used for troubleshooting in Three-Phase Power, compare it with one observed field value before changing hardware or settings. Planning cases should keep the conservative run visible.

Real-equipment notes for Three-Phase Power

Three-Phase Power entries should identify whether they are RMS, peak, average, or phase values. A correct formula can still be wrong when the waveform reference changes.

When three-phase real power becomes an input to another worksheet, copy the value only after the units and source condition have been verified.

Quick check before using three-phase real power

  1. Run a second case for the least certain value.
  2. Confirm every unit shown beside the input.
  3. Do not combine different equipment, time periods, or connection types in one run.

Audit trail for three-phase real power

Save the Three-Phase Power waveform reference, meter mode, and whether the values are RMS or peak.

Input setLine voltage, Line current, and Power factor
ResultThree-phase real power
Condition noteUnbalanced phase currents require phase-by-phase calculation.