Electrical Tools

Voltage Drop Calculator

Calculate voltage drop across a wire run. Shows voltage drop in volts and percentage. Checks compliance with KEC indoor (3%) and outdoor (5%) limits.

Input

Voltage (V)

Current (A)

One-way Length (m)

Wire Cross-section (mm²)

Enter custom size

Material

Copper Aluminum

Phase

Single Three

Formula: ΔV = (2×I×L×ρ)/A (single), (√3×I×L×ρ)/A (three-phase). Cu ρ=0.0175, Al ρ=0.028 Ω·mm²/m

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