30 amps to watts
30 amps is 3,600 watts at 120 volts and 7,200 watts at 240 volts, at a power factor of 1.
30 amps to watts at common voltages
| Voltage | Watts, W |
|---|---|
| 12 V DC | 360 |
| 24 V DC | 720 |
| 120 V | 3,600 |
| 240 V | 7,200 |
| 208 V three phase | 10,808 |
| 480 V three phase | 24,942 |
The AC and three-phase rows assume a power factor of 1, as for heaters and incandescent lamps. Motors and electronics draw more current for the same watts.
How to convert 30 amps to watts
Watts = amps × volts, so 30 amps carries 3,600 watts on a 120 V circuit and 7,200 watts on a 240 V circuit. On a 12 V DC system, 30 amps is 360 watts. At a power factor of 0.8, 30 amps at 120 V delivers 2,880 W.
How much of a 15 or 20 amp circuit 30 amps uses
On 120 V, 30 amps is more than a 15 or 20 amp circuit can carry: run it on 240 V or a larger dedicated circuit. As a continuous load, 30 A needs at least a 40 amp breaker (125% of the current, rounded up to a standard size).
The wire a 30 amp circuit needs, in copper and aluminum, is on the 30 amp wire size page.
Nearby values
| Amps, A | 120 V, W | 240 V, W |
|---|---|---|
| 5 | 600 | 1,200 |
| 10 | 1,200 | 2,400 |
| 15 | 1,800 | 3,600 |
| 20 | 2,400 | 4,800 |
| 30 | 3,600 | 7,200 |
| 50 | 6,000 | 12,000 |
Appliances that draw about 30 amps
Amps to watts calculator
1 for heaters and lights; motors and electronics 0.8–0.95
- Current
- 30 A
- Voltage
- 120 V
- Kilowatts
- 3.6 kW
How it is calculated
- Watts = 30 × 120 = 3,600