Voltage Drop Calculators

A fast, accurate voltage drop calculator designed for electricians, engineers, contractors, and DIY users. Instantly estimate voltage loss, choose the right wire size, and validate compliance for residential, commercial, and industrial projects. Supports single and three phase, copper or aluminum, and both AWG and metric sizes. Core features - One-tap voltage drop and percent drop with final voltage and power loss - Smart wire sizing to meet target voltage drop based on load, length, and material - Flexible inputs: AC/DC, single/three phase, AWG or mm², copper/aluminum, imperial or metric units Why it’s better - Fast and reliable results for job site decisions and engineering checks - Code-aware defaults and practical presets for common circuits - Clear, shareable summaries for quotes, submittals, and documentation Keywords: voltage drop calculator, electrical calculator, wire size, AWG, NEC, IEC, electrician tool, engineering productivity