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15 amps to watts
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1,800 W
15 amps at 120 V · 3,600 W at 240 V
15 amps to watts by voltage
| Voltage | Watts | kW |
|---|---|---|
| 12 V DC | 180 W | 0.18 kW |
| 24 V DC | 360 W | 0.36 kW |
| 120 V | 1,800 W | 1.80 kW |
| 208 V | 3,120 W | 3.12 kW |
| 230 V | 3,450 W | 3.45 kW |
| 240 V | 3,600 W | 3.60 kW |
| 208 V three-phase (PF 0.9) | 4,863 W | 4.86 kW |
| 480 V three-phase (PF 0.9) | 11,223 W | 11.22 kW |
Single-phase: W = A × V (power factor 1). Three-phase: W = √3 × A × V × PF; motors and electronics have PF below 1.
FAQ
How many watts is 15 amps?
15 A × 120 V = 1,800 W; at 240 V it is 3,600 W. Watts = amps × volts for resistive single-phase loads.
What breaker do I need for a 15 amp load?
For a continuous load (3+ hours) the NEC sizes the breaker at 125%: 18.75 A → next standard size 20 A. Check local code.
Wire size for a 20 A circuit · Ohm’s law calculator · All amps to watts
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