kW to Amps at 480V 3 Phase Calculator

Pre-configured for three-phase AC circuits at 480V. Adjust values below.

Calculator InputLive calculation
Conversion Result
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Enter values to calculate
Formula Used
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Watts
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Milliamps
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Horsepower
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BTU/hr
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How kW to Amps at 480V 3 Phase Works

1

Enter the motor or load power in kW

Use the nameplate rating. Industrial motors are typically rated in kW or HP (1 HP ≈ 0.746 kW).

2

Confirm voltage is 480V

480V is the standard US industrial three-phase voltage. The calculator is pre-set to 480V.

3

Enter the power factor

Industrial motors at full load typically have PF 0.85. Variable frequency drives (VFDs) can improve PF to near 1.0.

4

Read the per-phase line current

Use this value for conductor sizing, overcurrent protection, and motor starter selection.

kW to Amps at 480V 3 Phase Formula

480V 3-PhaseI = (kW × 1000) ÷ (1.732 × 480 × PF)

Standard formula for 480V three-phase. Denominator = 831.4 at PF 1.0.

Quick MultiplierAmps ≈ kW × 1.20 (at PF 1.0)

At 480V 3-phase PF 1.0, multiply kW by 1.20 for a quick estimate.

From HPI = (HP × 746) ÷ (1.732 × 480 × PF × η)

Convert HP to amps. η is motor efficiency (typically 0.90 to 0.96).

At 480V three-phase, 1 kW equals 1.20 amps at PF 1.0, or 1.42 amps at PF 0.85.

480V three-phase is the standard industrial voltage in the United States. It is used for large motors, industrial HVAC systems, manufacturing equipment, and data center power distribution. The higher voltage allows smaller conductors and lower current for the same power delivery.

Frequently Asked Questions

10 kW at 480V three-phase with PF 0.85 equals 14.16 amps per phase.

50 HP (37.3 kW) at 480V three-phase with PF 0.85 and 92% efficiency equals 55.2 amps.

480V reduces current by 4× compared to 120V for the same power. Lower current means smaller wire, smaller conduit, and lower I²R losses.

Size the breaker at 125% of the full-load current per NEC 430.52 for motor circuits. For a 20-amp motor load, use a 25-amp breaker.

Yes. All voltages above 50V can be lethal. 480V requires qualified personnel, proper PPE, and arc flash analysis per NFPA 70E.