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kW to Amps Calculator

Convert kilowatts to amperes

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Result

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Formulas

DCI = (kW×1000) ÷ V

AC 1-PhaseI = (kW×1000) ÷ (V×PF)

AC 3-PhaseI = (kW×1000) ÷ (√3×V×PF)

Quick Reference

kW	@240V	@480V
1 kW	4.17A	2.08A
5 kW	20.83A	10.42A
10 kW	41.67A	20.83A
50 kW	208.3A	104.2A

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How to Convert kW to Amps

Converting kilowatts (kW) to amperes (A) is essential for sizing electrical equipment, cables, and circuit breakers. The conversion depends on the type of electrical system you're working with.

Understanding the Conversion

Since 1 kilowatt equals 1000 watts, you first convert kW to watts, then apply the appropriate formula based on whether you have DC, single-phase AC, or three-phase AC power.

Practical Applications

This calculation is commonly used when sizing circuit breakers for motors, determining wire gauge for high-power equipment, and calculating load distribution in electrical panels.

Frequently Asked Questions

For DC: Amps = (kW × 1000) ÷ Volts. For single-phase AC: Amps = (kW × 1000) ÷ (Volts × Power Factor). For three-phase AC: Amps = (kW × 1000) ÷ (√3 × Volts × Power Factor).

At 240V DC or AC with PF=1, 5 kW equals approximately 20.83 amps: (5 × 1000) ÷ 240 = 20.83A.

Three-phase systems distribute power across three conductors, which is more efficient. The √3 factor (1.732) in the formula reflects this, resulting in lower current per phase for the same total power.