Conduit Fill Calculator

Conduit Fill is the percent of area inside the conduit taken up by the cable(s). Provides quick and easy results for the conduit fill percent, per NEC® guidelines.

Calculate Your Conduit Fill Percentage

A great tool to help electricians, engineers and contractors answer the question, "What size conduit do I use per the NEC®?"

The app will calculate the conduit fill percentages and jam probability for multiple conductors per NEC® Guidelines. Simply enter the conduit type and size, then specify your conductors.

Download for iOS

Download for iOS

Download for Android

Download for Android


If considering the use of Cable-In-Conduit (CIC) products, please contact Southwire at for more details on cable constructions, compliance, and weight limitations.

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