Three-phase kW to amps calculator

Preliminary estimate

Inputs

Calculation note

This is a balanced three-phase arithmetic conversion. Nameplate current, demand assumptions, conductor sizing, and protection review are outside this screen.

Method

Amps = kW x 1000 / (sqrt(3) x volts x power factor)

kVA = kW / power factor

Watts = kW x 1000

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Formula variables

  • kW is the real three-phase load entered by the user.
  • Voltage is the line-line nominal voltage.
  • Power factor is entered as a decimal from greater than zero to 1.
  • Amps are preliminary line current before nameplate and equipment review.

Assumptions

  • The calculator assumes a balanced three-phase load.
  • Power factor is entered by the user and directly affects current.
  • The result is a line-current estimate from real power, not a breaker or conductor size.
  • This calculator does not size conductors, breakers, disconnects, feeders, or equipment.

Examples

600 V equipment. A 75 kW three-phase load at 600 V and 0.90 PF estimates about 80.2 A.

Load schedule workflow. Use this result as an arithmetic check before using nameplate data, demand assumptions, and project-specific sizing methods.