kW to Amps Calculator
Convert kilowatts to amps for any circuit — DC, single-phase, or three-phase — with voltage presets and power factor.
1.0 for resistive loads; 0.8–0.9 typical for motors.
Current draw
0 A
A = kW × 1,000 ÷ (V × PF)
Planning estimates only. Breaker and cable sizing must follow local code — confirm with a licensed electrician.
kW to amps: the formulas
- DC: A = kW × 1,000 ÷ V
- AC single-phase: A = kW × 1,000 ÷ (V × PF)
- AC three-phase: A = kW × 1,000 ÷ (√3 × Vline-line × PF)
Quick reference at power factor 1.0:
| Power | Amps @ 120 V | Amps @ 230 V | Amps @ 240 V | Amps @ 400 V 3-φ |
|---|---|---|---|---|
| 1 kW | 8.3 A | 4.3 A | 4.2 A | 1.4 A |
| 2 kW | 16.7 A | 8.7 A | 8.3 A | 2.9 A |
| 3 kW | 25.0 A | 13.0 A | 12.5 A | 4.3 A |
| 5 kW | 41.7 A | 21.7 A | 20.8 A | 7.2 A |
| 7.4 kW | 61.7 A | 32.2 A | 30.8 A | 10.7 A |
| 10 kW | 83.3 A | 43.5 A | 41.7 A | 14.4 A |
| 22 kW | — | 95.7 A | 91.7 A | 31.8 A |
kW to amps FAQ
How do I convert kW to amps?
Amps = kW × 1,000 ÷ (V × PF). A 3 kW load at 230 V draws about 13 A. Three-phase adds a √3 divisor: A = kW × 1,000 ÷ (√3 × V × PF).
How many amps is 1 kW at 230 V?
About 4.3 A at power factor 1. The same kilowatt at 120 V draws about 8.3 A — lower voltage means higher current.
How many amps does a 7.4 kW EV charger draw?
About 32 A on a 230 V single-phase supply — which is why 7 kW chargers need a dedicated 32–40 A circuit.
Why does three-phase draw fewer amps for the same kW?
Power is spread across three conductors and the √3 factor reduces per-line current: 10 kW is ~43 A single-phase at 230 V but only ~14.4 A per line at 400 V three-phase.