40 Amps to Watts
40 amps is 4,800 watts at 120 volts and 9,600 watts at 240 volts (watts = amps × volts, at unity power factor).
40 Amps to Watts conversion table
| Voltage | Watts (PF 1.0) | Watts (PF 0.8) |
|---|---|---|
| 12 V DC | 480 W | — |
| 24 V DC | 960 W | — |
| 48 V DC | 1,920 W | — |
| 120 V AC | 4,800 W | 3,840 W |
| 208 V AC | 8,320 W | 6,656 W |
| 240 V AC | 9,600 W | 7,680 W |
| 277 V AC | 11,080 W | 8,864 W |
| 480 V AC | 19,200 W | 15,360 W |
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.
Frequently asked questions
4,800 watts (40 A × 120 V) for DC or resistive AC loads. With a 0.8 power factor (motors), the same current only delivers 3,840 W of real power.
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