electrical wire sizing

Instant Voltage Drop Calculator — 1-Phase & 3-Phase, Cu/Al, AWG/kcmil (Volts & %)

Quickly estimate line losses and ensure your circuits run efficiently with our instant voltage drop calculator for 1‑phase and 3‑phase systems, Cu/Al conductors, and AWG/kcmil sizing (Volts & %). Save time and avoid costly mistakes with clear results in volts and percent.

Electrical Wire Size Calculator – NEC Ampacity by Load Current, Insulation & Cu/Al

Need the right conductor for your project? Our wire size calculator quickly determines NEC ampacity based on load current, insulation type, and copper or aluminum conductors so you get safe, code-compliant results every time.