NEC Voltage Drop Calculator

Calculate voltage drop for branch circuits and feeders per NEC recommendations (3% branch, 5% total).

System nominal voltage.
V
Circuit current in amps.
A
Distance from panel to load.
ft
Wire area: 14AWG=4110, 12=6530, 10=10380, 8=16510, 6=26240.
CM
1 for single-phase, 3 for three-phase.

Results

Voltage Drop-V
Voltage Drop-%
Voltage at Load-V
References: NEC 210.19(A) FPN No. 4; NEC 215.2(A) FPN No. 2; IEEE Std 141 (Red Book)