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.