10 kW to amps: 230 V and 400 V calculator
For 10 kW of electrical active input power at power factor 1, current is about 43.48 A at 230 V single phase or 14.43 A per line at 400 V balanced three phase. These are conditional examples: voltage, phase system, power factor and the meaning of the 10 kW rating determine the result.
10 kW worked examples
| System | Assumptions | Line current |
|---|---|---|
| 230 V, single phase | PF = 1 | 43.48 A |
| 400 V, balanced three phase | PF = 1 | 14.43 A |
| 400 V, motor shaft output | PF = 0.8; η =0.9 | 20.05 A |
Calculate current for 10 kW
Formulas and power definition
For active electrical input power: single phase I = P / (V × PF); balanced three phase I = P / (√3 × U × PF). Here P is in watts, V is phase-to-neutral voltage for the 230 V example, and U is line-to-line voltage for the 400 V example. PF = cos φ only for sinusoidal voltage and current.
When 10 kW is mechanical shaft output, first calculate electrical input P = Pout / η. Current is then divided by efficiency η as well as power factor. Do not apply efficiency a second time when the rating already gives electrical input power. At PF = 0.8 and η = 0.9, the three-phase example gives about 20.05 A per line.
Three-phase line current is not the sum of three line currents. These steady-state examples do not select a cable, fuse, breaker or supply contract and do not model startup current, harmonics or unbalanced loads. Use equipment data and the applicable installation design method for those decisions.
Formula source
Schneider Electric Electrical Installation Guide: active power and motor efficiency relationships. Checked on 5 October 2026.
Schneider Electric — Electrical Installation Guide