Voltage Drop Calculator
Calculate voltage drop and percent drop for copper or aluminium wire in single-phase, three-phase or DC circuits. Flags drops above 3% and 5%.
A
V
Line-to-line for three-phase.Formula
Vd = k × ρ × L × I ÷ A (k = 2 single-phase/DC, √3 three-phase; ρ at 75 °C; L = one-way length)