150 Watts to Amps
150 W = 1.25 A
150 watts draws 1.25 amps on a 120-volt circuit (0.63 A at 240 V).
Step by step
- Use the formula amps = watts ÷ volts (I = P ÷ V).
- At 120 V: 150 ÷ 120 = 1.25 A.
- At 240 V: 150 ÷ 240 = 0.625 A.
For a continuous load, size the circuit so this draw is no more than 80% of the breaker rating — at least a 15 A circuit.
Details
- At 120 V (US outlet)
- 1.25 A
- At 240 V
- 0.63 A
- At 230 V (Europe, UK)
- 0.65 A
- At 12 V DC
- 12.5 A
- Kilowatts
- 0.15 kW
- Heat output
- 512 BTU/h
How it works
Current in amps equals power in watts divided by voltage: I = P ÷ V. This is exact for DC and for resistive AC loads like heaters, kettles and incandescent bulbs. Motors and some electronics on AC have a power factor below 1, which means they draw a little more current than this simple formula shows. The same appliance draws half the current at 240 V as at 120 V.
Nearby values
| Watts | Amps |
|---|---|
| 50 W | 0.42 A (120 V) · 0.21 A (240 V) |
| 60 W | 0.5 A (120 V) · 0.25 A (240 V) |
| 75 W | 0.63 A (120 V) · 0.31 A (240 V) |
| 100 W | 0.83 A (120 V) · 0.42 A (240 V) |
| 150 W | 1.25 A (120 V) · 0.63 A (240 V) |
| 200 W | 1.67 A (120 V) · 0.83 A (240 V) |
| 250 W | 2.08 A (120 V) · 1.04 A (240 V) |
| 300 W | 2.5 A (120 V) · 1.25 A (240 V) |
| 350 W | 2.92 A (120 V) · 1.46 A (240 V) |
Related conversions
Frequently asked questions
How many amps is 150 watts?
1.25 A at 120 V, or 0.63 A at 240 V.
Can a 15 amp circuit handle 150 watts?
Yes, as a continuous load — 150 W draws 1.25 A, under the 12 A (80%) limit of a 15 A circuit.
How many amps is 150 watts at 12 volts?
12.5 A.
How do you convert watts to amps?
Divide the watts by the voltage. For AC motors, also divide by the power factor.