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Electrical power
Calculate DC or resistive-circuit power, current, energy, and cost.
Calculators / Science / Three-phase power
Three-phase power calculator
Estimate balanced three-phase real power.
On this page
Input real power12.47kW
Estimated output power11.47kW
Calculator controls
How to calculate
Estimate balanced three-phase real power.
real power = √3 × line voltage × line current × power factor
Worked example
Line-to-line voltage (V): 400; Line current (A): 20; Power factor: 0.9; Efficiency (%): 92.
Input real power: 12.47 kW; Estimated output power: 11.47 kW.
Assumptions and limits
Applies to a balanced three-phase system. Connection, harmonics, phase imbalance, starting current, and equipment ratings require engineering review.
Results are rounded for display; calculations use unrounded values. Read our calculation methodology.
Understanding the result
Estimate balanced three-phase real power. The result follows the displayed formula and keeps every adjustable assumption visible.
When this tool is useful
Use this tool to plan quantities or compare scenarios before making a purchase or technical decision.
Understanding your inputs
| Input | What to enter |
|---|---|
| Line-to-line voltage (V) | Enter a number of at least 0.000001 and no more than 1000000000000. |
| Line current (A) | Enter a number of at least 0 and no more than 1000000000000. |
| Power factor | Enter a number of at least 0 and no more than 1. |
| Efficiency (%) | Enter a number of at least 0 and no more than 100. |
Frequently asked questions
What can change the three-phase power result?
Applies to a balanced three-phase system. Connection, harmonics, phase imbalance, starting current, and equipment ratings require engineering review.
Should I round the inputs first?
No. Enter the best measurements available and round only the practical final quantity, such as full packs, boards, sheets, or components.