ElectricianCalc NEC Calculator

The electrical calculator that gives you NEC-compliant numbers in seconds — voltage drop, wire size, conduit fill, ampacity, box fill — all offline.

Stop flipping through the codebook on a ladder. ElectricianCalc gives you the wire size, voltage drop, conduit fill, and ampacity numbers an inspector signs off on — all referenced to current NEC tables, all available offline.

WHAT'S INSIDE

• Wire Size — by ampacity and length, with VD correction
• Voltage Drop — single-phase, 3-phase, DC; AWG and metric
• Conduit Fill — EMT, IMC, RMC, PVC; per NEC Chapter 9
• Ampacity — THHN, NM, MC, SE; by ambient and bundling
• Ohm's Law — V/I/R/P with unit toggling
• Power / kVA — three phase, line/phase voltage, power factor
• Motor FLA + OCPD — full-load amps and overcurrent protection per NEC 430
• Box Fill — NEC 314.16 by conductor count and size
• Service Calc — load calc preview for residential

WHO IT'S FOR

Licensed electricians, apprentices studying for the journeyman exam, inspectors, controls techs, low-voltage installers, hobbyists doing serious DIY.

FREE vs PRO

Free forever: voltage drop, wire size, ohm's law, conduit fill basics.
Pro unlocks ampacity correction tables, full NEC reference, motor FLA + OCPD, box fill, service calc. One-time or subscription.

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NEC REFERENCES ARE INFORMATIONAL. The user is responsible for verifying against the current Code adopted by their AHJ.

OFFLINE. NO ACCOUNT. NO ADS.
ElectricianCalc works in basements, attics, and metal-frame buildings where signal dies. Everything runs locally.