Electrician Calculators

Free NEC-based calculators for electricians: voltage drop, wire size, conduit fill and more. Fast, mobile-friendly, with code references.

01
Conduit Fill Calculator

Free NEC conduit fill calculator for EMT and PVC: THHN/THWN-2 conductors, Chapter 9 fill limits, instant percentage and the max number of wires that fit.
02
Voltage Drop Calculator

Free NEC-based voltage drop calculator: single- and three-phase, copper or aluminum, AWG and kcmil sizes. Instant results with a wire size recommendation.