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.
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Ohm's Law Calculator
Solve for voltage, current, resistance or power from any two values.
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Wire Gauge Calculator
Find the right AWG wire size for any load and voltage drop.