3 kW to Amps — How Many Amps Is 3 kW?
3 kW equals 12.50 amps at 240V (single phase) or 7.22 amps at 240V 3-phase. Common 3kW loads: Small water heater element, window AC, central AC fan.
3 kW to Amps
12.50 A
at 240V single phase
3 kW Amps at Every Voltage
| Voltage | 1-Phase | 3-Phase |
|---|---|---|
| 120V | 25.00A | 14.43A |
| 208V | 14.42A | 8.33A |
| 240V | 12.50A | 7.22A |
| 277V | 10.83A | 6.25A |
| 480V | 6.25A | 3.61A |
The Formula
Single Phase: Amps = (kW × 1000) ÷ Volts. For 3 kW at 240V: (3 × 1000) ÷ 240 = 12.50A.
Three Phase: Amps = (kW × 1000) ÷ (Volts × 1.732). For 3 kW at 240V 3φ: (3 × 1000) ÷ (240 × 1.732) = 7.22A.
Wire and Breaker for 3 kW
At 240V single-phase (12.5A), recommended: 14 AWG copper with a 15A breaker. Use our Wire Size Calculator for exact sizing.
Disclaimer: Calculations for reference. Consult a licensed electrician.