3,500 Watts to Amps — How Many Amps Is 3,500 Watts?
3,500 Watts equals 29.17 amps at 120V or 14.58 amps at 240V. Common 3500W devices: Central AC unit, large power tool.
3,500 Watts Amps at Every Voltage
| Voltage | Single Phase | Three Phase |
|---|---|---|
| 120V | 29.17A | 16.84A |
| 208V | 16.83A | 9.72A |
| 240V | 14.58A | 8.42A |
| 277V | 12.64A | 7.30A |
| 480V | 7.29A | 4.21A |
The Formula
Single Phase: Amps = Watts ÷ Volts. For 3,500 Watts at 120V: 3500 ÷ 120 = 29.17A.
Three Phase: Amps = Watts ÷ (Volts × 1.732). For 3,500 Watts at 240V 3-phase: 3500 ÷ (240 × 1.732) = 8.42A.
With power factor: Amps = Watts ÷ (Volts × PF). A PF of 0.8 increases the current draw by 25%.
Wire and Breaker for 3,500 Watts at 120V
At 120V, 3,500 Watts draws 29.2A. Recommended: 10 AWG copper wire with a 30A breaker per NEC 310.16. For continuous loads (3+ hours), apply 125% rule. Use our Wire Size Calculator for exact sizing.
Common 3500W Devices
Central AC unit, large power tool. 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.