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NEC-referenced calculators built for the jobsite: modern fields and pickers — no keystroke sequences to memorize, no manual required. Voltage drop is free, forever. One one-time purchase unlocks everything else. No subscription, no ads, no account, 100% offline. CALCULATORS Voltage Drop — check a run or find the wire size for a max drop (free) Ohm's Law — enter any two of V/I/R/P (free) Wire Size & Ampacity — 60/75/90°C copper and aluminum, 240.4(D) breaker caps Conduit Fill — THHN in EMT, mixed sizes, instant compliant/overfilled verdict Box Fill — 314.16(B) volumes with per-item breakdown Motor FLA estimate, Transformer sizing, Dwelling Load (220.82 optional method) Quick Reference breaker/wire pairings and Conversions BUILT FOR PROS Inspector-ready PDF reports — export any result with inputs, NEC article citations, your company name and license number. Hand it to the inspector. Saved jobs — group calculations by project, reopen them with every input restored, and export a whole job as one PDF packet for the submittal. NEC edition switching — 2017, 2020, and 2023 citations included. All editions, one price, forever. No paid "code year" upgrades. Glove-friendly controls, dark mode default for panel rooms and attics. Results are estimates for planning and study. Verify against the current NEC and local amendments. Not a substitute for the NEC or a licensed electrician.
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