Building Wire Selector vs EV Calc Pro

Southwire's Building Wire Selector determines the minimum conductor size and the best wire and cable type for a particular installation, following the National Electrical Code® wiring methods.

EV Calc Pro is the professional-grade electrical calculator built specifically for EV charger installers and electricians. Stop doing math on paper — get accurate, NEC-compliant results in seconds. CALCULATORS INCLUDED: EV Charger Load — Complete circuit analysis for EV charger installations EV Site Load — Full service load calculation for multi-charger sites (NEC 220, 625) Wire Size — NEC conductor sizing with temperature and conduit corrections Voltage Drop — Voltage drop analysis with pass/fail results Breaker Sizing — Overcurrent protection sizing per NEC Transformer Sizing — kVA transformer sizing for EV service upgrades Conduit Fill — NEC 358/344 conduit fill percentage calculator Grounding Conductor — Equipment grounding conductor sizing Ampacity Derating — Temperature and conduit fill derating per NEC 310 Box Fill — NEC 314.16 box fill calculation Power Calculator — Watts, amps, and volts conversion WHY EV CALC PRO: • Built for the field — fast inputs, instant results • 100% offline — no internet required, works on job sites • NEC code references on every calculator • Dark mode for working in low-light conditions • Export and share results via text, email, or any app • Free — no subscription, no paywalls Part of the Charge Rigs family of tools for EV charging professionals.