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.

What's New

Version 2.0.2

Bug fixes.

Ratings and Reviews

3.9 out of 5

18 Ratings

18 Ratings



Great app. Best of the conduit sizing apps. Simple interface. Tells you the actual calculated fill, not just pass/fail. Also calculates jam ratio. They've limited the conductor types to those actually used in construction so you don't need to sort through every wire type. Huge time saver if you size a lot of conduit.

Has Everything you will need

Frustrated :

I used to run a lot of conduit and was good at it. I haven't bent pipe in a few years and found that it was like learning all over again. So I found this app and tried it. This is such a time saver and right on. Especially the rolling offsets and kicked 90's. Great App

Very useful


Needed quick access to this information during a walkthrough today and it worked great. Very easy to use.


Southwire Company
21.2 MB
Requires iOS 9.0 or later. Compatible with iPhone, iPad, and iPod touch.
Age Rating
Rated 4+
© 2018 Southwire® Company, LLC


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