Southwire® Conduit Fill Calc

279 reviews
Content rating
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About this app

Southwire has created this great tool to help electricians, engineers and contractors answer the question, “What size conduit do I use” per the NEC®, includes fill percentages and jam probability. If you do not have the NEC book handy or do not want to spend time manually calculating the Conduit Fill %, this is the right app for you.

The app provides quick and easy navigation. Enter the Conduit Type and Size and specify your conductors. The App will calculate the Conduit Fill % as per NEC Guidelines.

Southwire Company is North America’s leading manufacturer of wire and cable used in the distribution transmission of electricity. Throughout its history, our company has sought to deliver power through our products, our service and by helping empower our customers, employees and communities.

The App Answers the question, “What size conduit do I use” includes fill percentages and jam probability per the NEC®. With one click, you can email your results.
Updated on
Apr 27, 2022

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
This app may collect these data types
Location and App info and performance
Data is encrypted in transit
You can request that data be deleted
279 reviews
Jim Princehorn - G
November 28, 2022
The conduit fill calculator is VERY temperamental, when attempting to scroll the screen. You must be very exact on where you touch the screen, or else, instead of scrolling the screen, you change one of the parameters in your plan. It might be more useful on a computer, but is tough to deal with on either of my phones.
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R. Crewse
December 16, 2020
It's easy to use and so far accurate . My only problem is with the scrolling. It is finicky about where you must touch the screen to scroll correctly. I would recommend this app.
11 people found this review helpful
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Mark Schmidt
January 26, 2023
The diameters of wire in the app does not line up with the table in the NEC. (Ch 9 table 5.) The values are smaller than the table values, throwing off calculations. Need to update/fix this.
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What's new

Performance enhancements