Voltage Drop Calculator

Calculate wire voltage drop based on wire gauge (AWG), length, current, and material. NEC recommends keeping voltage drop below 3%.

Inputs

Voltage Drop
2.997 V
2.5% — ✓ Within NEC 3% limit

Results

PropertyValue
Wire gaugeAWG 10
Resistance (Copper)0.9989 Ω/1000ft
Round-trip resistance0.1998 Ω
Voltage drop2.997 V
% Voltage drop2.5%
End voltage117 V

Copper Wire Resistance (Ω/1000 ft)

AWGCopperAluminumArea (cmil)
4/00.049010.0805211,600
3/00.06180.1015167,800
2/00.077930.128133,100
1/00.098270.1615105,600
10.12390.203683,690
20.15630.256766,360
30.1970.323752,620
40.24850.408241,740
60.39510.649126,250
80.62821.03216,510
100.99891.64110,380
121.5882.6086,530
142.5254.1484,107
164.0166.5952,583
186.38510.491,624
2010.1516.681,022