800 Watts to Amps — How Many Amps Is 800 Watts?
800 Watts equals 6.67 amps at 120V or 3.33 amps at 240V. Common 800W devices: Sump pump, small heater.
800 Watts Amps at Every Voltage
| Voltage | Single Phase | Three Phase |
|---|---|---|
| 120V | 6.67A | 3.85A |
| 208V | 3.85A | 2.22A |
| 240V | 3.33A | 1.92A |
| 277V | 2.89A | 1.67A |
| 480V | 1.67A | 0.96A |
The Formula
Single Phase: Amps = Watts ÷ Volts. For 800 Watts at 120V: 800 ÷ 120 = 6.67A.
Three Phase: Amps = Watts ÷ (Volts × 1.732). For 800 Watts at 240V 3-phase: 800 ÷ (240 × 1.732) = 1.92A.
With power factor: Amps = Watts ÷ (Volts × PF). A PF of 0.8 increases the current draw by 25%.
Wire and Breaker for 800 Watts at 120V
At 120V, 800 Watts draws 6.7A. 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 800W Devices
Sump pump, small heater. 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.