All Tools
Wire Sizing Calculator
Find the right wire gauge with NEC ampacity derating and voltage drop check.
Breaker Amps
Distance (ft)
Voltage
120V
208V
240V
480V
Material
Copper
Aluminum
Insulation
THHN
XHHW
NM (Romex)
UF
Conductors in Raceway
Ambient Temp
°F
Circuit Type
Branch Circuit
Feeder
Three Phase
Calculate Wire Size