Voltage Drop Calculator

Estimate voltage drop using amps, one-way conductor length, system voltage, phase type, and a selected conductor size. This uses simplified resistance values for quick checks.

Current (amps) One-Way Length (ft) System Voltage (V) Phase Conductor Material Conductor Size

Result

Result will appear here.

Formula

Single-phase: 2 × I × L × R, Three-phase: 1.732 × I × L × R

Notes

Uses simplified resistance values for quick field estimates.
Length is one-way feet.
Confirm final design with applicable code and engineering review.