4 kW to Amps — How Many Amps Is 4 kW?
4 kW equals 16.67 amps at 240V (single phase) or 9.62 amps at 240V 3-phase. Common 4kW loads: Large water heater, small solar system, central AC.
4 kW to Amps
16.67 A
at 240V single phase
4 kW Amps at Every Voltage
| Voltage | 1-Phase | 3-Phase |
|---|---|---|
| 120V | 33.33A | 19.25A |
| 208V | 19.23A | 11.10A |
| 240V | 16.67A | 9.62A |
| 277V | 14.44A | 8.34A |
| 480V | 8.33A | 4.81A |
The Formula
Single Phase: Amps = (kW × 1000) ÷ Volts. For 4 kW at 240V: (4 × 1000) ÷ 240 = 16.67A.
Three Phase: Amps = (kW × 1000) ÷ (Volts × 1.732). For 4 kW at 240V 3φ: (4 × 1000) ÷ (240 × 1.732) = 9.62A.
Wire and Breaker for 4 kW
At 240V single-phase (16.7A), recommended: 12 AWG copper with a 20A breaker. Use our Wire Size Calculator for exact sizing.
Disclaimer: Calculations for reference. Consult a licensed electrician.