How Many Amps Is 1000 Watts?
At 120 V DC, 1000 watts = 8.3333 A. At 240 V DC, 1000 watts = 4.1667 A. For AC circuits, divide by voltage × power factor (e.g. at 120V AC, PF 0.8: 10.4167 A). Use the calculator below for any voltage or circuit type.
1000 Watts to Amps — DC Reference Chart
| Voltage | Current (DC) | Application |
|---|---|---|
| 12 V | 83.3333 A | 12V automotive / RV / solar |
| 24 V | 41.6667 A | 24V solar / industrial DC |
| 48 V | 20.8333 A | 48V telecom / e-bike |
| 120 V | 8.3333 A | US household standard |
| 240 V | 4.1667 A | US/EU 240V circuit |
| 480 V | 2.0833 A | Industrial 3-phase (per phase) |
Breaker sizing: At 120V, 1000W draws 8.33A. Per NEC 210.20, size breakers at 125% of continuous load: 8.33 × 1.25 = 10.42A. A standard 15A breaker is sufficient. At 240V (4.17A), a 15A breaker is also adequate. Always consult a licensed electrician.
Frequently Asked Questions
How many amps is 1000 watts at 120V?
1000 watts at 120V DC = 1000 ÷ 120 = 8.3333 amps. For AC single-phase with PF 0.8: 1000 ÷ (120 × 0.8) = 10.4167 amps.
How many amps is 1000 watts at 240V?
1000 watts at 240V DC = 1000 ÷ 240 = 4.1667 amps. For AC single-phase with PF 0.8: 1000 ÷ (240 × 0.8) = 5.2083 amps.
What size breaker do I need for 1000 watts?
At 120V, 1000W draws 8.33A. The NEC requires breakers sized at 125% for continuous loads: 8.33 × 1.25 = 10.42A. A 15A breaker is sufficient. At 240V (4.17A), a 15A breaker is also adequate.