Electrician Calculators

Free NEC-compliant tools for conduit fill, Ohm's Law and wire gauge. Instant results for electricians and DIYers — no signup needed.

Conduit Fill Calculator

Check NEC fill percentage for any conduit and wire combination.

Ohm's Law Calculator

Solve for voltage, current, resistance or power from any two values.

Wire Gauge Calculator

Find the right AWG wire size for any load and voltage drop.