Skip to main content
ElecToolsHQ

Three Phase Current Calculator

Calculate three-phase current from power, line voltage, and power factor (I = P ÷ (√3 × V × PF)).

Formula

I = P ÷ (√3 × V × PF)

I
Line current, in amps
P
Real power, in watts
V
Line-to-line voltage, in volts
PF
Power factor, between 0 and 1

What this calculator does

Calculates the line current drawn by a balanced three-phase load from its power rating, voltage, and power factor.

Use cases

  • Size conductors or a breaker for a three-phase load's power rating
  • Estimate full-load current for a three-phase motor
  • Cross-check a nameplate current rating against a calculated value

Related