1,800 Watts to Amps, How Many Amps Is 1,800 Watts?
1,800 Watts equals 15.00 amps at 120V or 7.50 amps at 240V. Common 1800W devices: Dishwasher, large hair dryer, countertop oven.
1,800 Watts Amps at Every Voltage
| Voltage | Single Phase | Three Phase |
|---|---|---|
| 120V | 15.00A | 8.66A |
| 208V | 8.65A | 5.00A |
| 240V | 7.50A | 4.33A |
| 277V | 6.50A | 3.75A |
| 480V | 3.75A | 2.17A |
The Formula
Single Phase: Amps = Watts ÷ Volts. For 1,800 Watts at 120V: 1800 ÷ 120 = 15.00A.
Three Phase: Amps = Watts ÷ (Volts × 1.732). For 1,800 Watts at 240V 3-phase: 1800 ÷ (240 × 1.732) = 4.33A.
With power factor: Amps = Watts ÷ (Volts × PF). A PF of 0.8 increases the current draw by 25%.
Wire and Breaker for 1,800 Watts at 120V
At 120V, 1,800 Watts draws 15.0A. 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 1800W Devices
Dishwasher, large hair dryer, countertop oven. 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.