Minimum Conductor Size
Voltage Drop Calculator
Note: Conductors must also be sized
for current carrying capacity.

Voltage Drop Calculator by electrician2.com
k=12.9 for copper
or k=21.2 for aluminum
Select Material


Select Voltage and Phase

 Enter Maximum
voltage drop in per cent
Enter 1-way circuit
length in feet

 Enter Load
in amperes
Calculated Voltage drop
 Voltage at load
end of circuit
Calculated CMA of
Conductor
 CMA of
Conductor
 Size of
conductor

CMA = circular mil area from NEC Chapter 9 Table 8.