Wire Resistance Calculator

Calculate wire resistance, voltage drop per foot, and power loss for copper and aluminum conductors.

Total one-way length of the conductor.
m
Wire area. 2.5mm²=14AWG, 4mm²=12AWG, 16mm²=6AWG.
mm²
Copper: 0.0175, Aluminum: 0.0283 Ω·mm²/m at 20°C.
Ω·mm²/m
Conductor operating temperature.
°C
Current flowing through the wire.
A

Results

Resistance at 20°C-Ω
Resistance at Operating Temp-Ω
Voltage Drop (2-way)-V
Power Loss-W
References: NEC Chapter 9 Table 8; ASTM B8