Three-Phase Power Calculator
Calculate three-phase power, current, and power factor.
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How It Works
P = root(3) x V x I x PF. Root(3) = 1.732 accounts for 120-degree phase offset. More efficient than single-phase for large loads.
Formula
P = sqrt(3) x V x I x PFQuick Reference
Common calculations — results you can verify instantly.
480V, 50A, PF=0.85
1.732×480×50×0.85
35.3 kW
208V, 30A, PF=0.90
1.732×208×30×0.90
9.73 kW
Single vs 3-phase
Same voltage and current
3-phase is 1.73× more power
Tips & Shortcuts
Most industrial motors use 3-phase power.
208V line-to-line commercial. 480V industrial.
Common Mistakes
Using single-phase formula for 3-phase
3-phase: P = 1.732 x V x I x PF. Not V x I x PF.
Confusing line and phase voltage
Line voltage = root(3) x phase voltage.
Frequently Asked Questions
More efficient, constant power delivery, smaller conductors.
208V commercial. 480V industrial.
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