Voltage Drop Calculator

Calculate voltage drop along a cable run using conductor resistance.

Current (A)

A

One-Way Length (m)

m

Conductor Area (mm²)

mm²

Material

Result

—

Formulas

R = ρ × 2L / A (round trip)
Vdrop = I × R
ρ copper = 1.72×10⁻⁸ Ω·m, ρ aluminium = 2.82×10⁻⁸ Ω·m