NEC Box & Conduit Calc

About this app

NEC Box & Conduit Calc is the fastest, most accurate way to calculate box fill, conduit fill, required conduit size, and wire volume — all to the NEC (National Electrical Code). Built for electricians, contractors, engineers, inspectors, and apprentices, it delivers instant, code-compliant results that save time on every job — right from your pocket, even offline. Key Features • Box Fill Calculator – Device counts, equipment grounding, internal clamps – All common box sizes and types – NEC-compliant volume with clear breakdowns • Conduit Fill Calculator – EMT, PVC, RMC, IMC & more – Multiple conductor sizes per conduit – NEC fill percentages with instant pass/fail • Required Conduit Size – Enter your conductors, get the correct conduit size instantly – See the next size up and down • NEC Reference Tables – Chapter 9 Tables 1, 4 & 5 at your fingertips – Browse every NEC box and conduit size • Accurate Wire Volume Data – Built-in AWG volume reference for field, shop, and inspection • Professional PDF Reports – Export clean, shareable reports for your records or the inspector • Clean, Simple Interface – Designed for electricians under time pressure – Easy to use with gloves – Works fully offline Perfect For • Electricians • Electrical contractors • Students & apprentices • Inspectors • Engineers & designers Download now and get code-compliant fill calculations in seconds — on every job.

• Cleaner layout and faster experience across calculators and reference tables • Bug fixes and performance improvements

Momentum comes from crawler snapshots for the tracked storefront. “Viral growth signal” means unusually fast recent rating gains; it is an indicator, not download data.

1. First observed Aug 10, 2026 · 3:33 PM Free