4 Amps to Watts
4 A = 480 W
4 amps at 120 volts is 480 watts (960 W at 240 V).
Step by step
- Use the formula watts = amps × volts (P = I × V).
- At 120 V: 4 × 120 = 480 W.
- At 240 V: 4 × 240 = 960 W.
Details
- At 120 V
- 480 W
- At 240 V
- 960 W
- At 230 V
- 920 W
- At 12 V DC
- 48 W
- Continuous load (80%) at 120 V
- 384 W
- Kilowatts at 240 V
- 0.96 kW
How it works
Power in watts equals current in amps multiplied by voltage: P = I × V. On a standard US 120 V outlet each amp delivers 120 watts; on a 240 V circuit each amp delivers 240 watts. For breakers, plan continuous loads at no more than 80% of the rating — that is why a 15 A circuit is usually limited to about 1,440 W of continuous load.
Nearby values
| Amps | Watts |
|---|---|
| 1 A | 120 W (120 V) · 240 W (240 V) |
| 1.5 A | 180 W (120 V) · 360 W (240 V) |
| 2 A | 240 W (120 V) · 480 W (240 V) |
| 2.5 A | 300 W (120 V) · 600 W (240 V) |
| 3 A | 360 W (120 V) · 720 W (240 V) |
| 4 A | 480 W (120 V) · 960 W (240 V) |
| 5 A | 600 W (120 V) · 1,200 W (240 V) |
| 6 A | 720 W (120 V) · 1,440 W (240 V) |
| 7 A | 840 W (120 V) · 1,680 W (240 V) |
Related conversions
Frequently asked questions
How many watts is 4 amps?
480 W at 120 V, or 960 W at 240 V.
How many watts can a 4 amp breaker handle continuously?
About 384 W at 120 V (80% of 480 W).
How many watts is 4 amps at 12 volts?
48 W.
How do you convert amps to watts?
Multiply the amps by the voltage. For AC motors, also multiply by the power factor.