Voltage Drop Calculator: Optimize Electrical Systems for DC and AC Circuits

Calculate voltage drops in DC, single-phase, or three-phase circuits in seconds. Enter system type, material, wire size, run length, load, and (for AC) power factor & frequency—the tool returns volts lost, percentage, R, X, and code-compliance. Copper’s resistivity (1.68 × 10⁻⁸ Ω·m) is 40 % lower than aluminum’s, so it needs thinner conductors (ASM Handbook, 2017).