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30 amps to watts
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3,600 W
30 amps at 120 V · 7,200 W at 240 V
30 amps to watts by voltage
| Voltage | Watts | kW |
|---|---|---|
| 12 V DC | 360 W | 0.36 kW |
| 24 V DC | 720 W | 0.72 kW |
| 120 V | 3,600 W | 3.60 kW |
| 208 V | 6,240 W | 6.24 kW |
| 230 V | 6,900 W | 6.90 kW |
| 240 V | 7,200 W | 7.20 kW |
| 208 V three-phase (PF 0.9) | 9,727 W | 9.73 kW |
| 480 V three-phase (PF 0.9) | 22,447 W | 22.45 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 30 amps?
30 A × 120 V = 3,600 W; at 240 V it is 7,200 W. Watts = amps × volts for resistive single-phase loads.
What breaker do I need for a 30 amp load?
For a continuous load (3+ hours) the NEC sizes the breaker at 125%: 37.5 A → next standard size 40 A. Check local code.
Wire size for a 40 A circuit · Ohm’s law calculator · All amps to watts
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