1,000 Watts to Amps — How Many Amps Is 1,000 Watts?
1,000 Watts equals 8.33 amps at 120V or 4.17 amps at 240V. Common 1000W devices: Toaster, iron, small microwave.
1,000 Watts Amps at Every Voltage
| Voltage | Single Phase | Three Phase |
|---|---|---|
| 120V | 8.33A | 4.81A |
| 208V | 4.81A | 2.78A |
| 240V | 4.17A | 2.41A |
| 277V | 3.61A | 2.08A |
| 480V | 2.08A | 1.20A |
The Formula
Single Phase: Amps = Watts ÷ Volts. For 1,000 Watts at 120V: 1000 ÷ 120 = 8.33A.
Three Phase: Amps = Watts ÷ (Volts × 1.732). For 1,000 Watts at 240V 3-phase: 1000 ÷ (240 × 1.732) = 2.41A.
With power factor: Amps = Watts ÷ (Volts × PF). A PF of 0.8 increases the current draw by 25%.
Wire and Breaker for 1,000 Watts at 120V
At 120V, 1,000 Watts draws 8.3A. Recommended: 14 AWG copper wire with a 15A breaker per NEC 310.16. For continuous loads (3+ hours), apply 125% rule. Use our Wire Size Calculator for exact sizing.
Common 1000W Devices
Toaster, iron, small microwave. Always check the device nameplate for exact wattage — rated watts may differ from actual consumption.
Disclaimer: Calculations are for reference. Verify with device nameplate. Consult a licensed electrician for installations.