400 Watts to Amps
400 watts is 3.33 amps at 120 volts and 1.67 amps at 240 volts (amps = watts ÷ volts, at unity power factor). Every common voltage below.
400 Watts to Amps conversion table
| Voltage | Amps (PF 1.0) | Amps (PF 0.8) |
|---|---|---|
| 12 V DC | 33.3 A | — |
| 24 V DC | 16.7 A | — |
| 48 V DC | 8.33 A | — |
| 120 V AC | 3.33 A | 4.17 A |
| 208 V AC | 1.92 A | 2.4 A |
| 240 V AC | 1.67 A | 2.08 A |
| 277 V AC | 1.44 A | 1.81 A |
| 480 V AC | 0.83 A | 1.04 A |
PF = power factor. Resistive loads (heaters, incandescent lights) are PF 1.0; motors and compressors typically run PF 0.8-0.9. For a different value, use the interactive converter.
What draws about 400 watts?
Frequently asked questions
3.33 amps (400 W ÷ 120 V). On a circuit, a 400 W resistive load needs at least a 15 A breaker — and 25% more if it runs 3+ hours continuously.
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