Calculate voltage drop in electrical circuits with wire size recommendations and NEC compliance
Enter your electrical circuit specifications to calculate voltage drop
Total current the circuit will carry in amperes
Distance from power source to load (one direction only)
Nominal voltage of the electrical system
American Wire Gauge size - larger numbers = smaller wire
Number of conductors run in parallel per phase (1-4)
Ambient temperature affecting conductor resistance
Calculated results showing voltage drop and system efficiency
Enter circuit parameters to see voltage drop analysis
Click any preset to quickly calculate common electrical circuits
Current: 15A
Distance: 50ft
Voltage: 120V
Wire: 14 AWG copper
Current: 20A
Distance: 75ft
Voltage: 120V
Wire: 12 AWG copper
Current: 32A
Distance: 100ft
Voltage: 240V
Wire: 10 AWG copper
Current: 50A
Distance: 200ft
Voltage: 480V
Wire: 6 AWG copper