• Southwire® Conduit Fill Calc 1
  • Southwire® Conduit Fill Calc 2
  • Southwire® Conduit Fill Calc 3
  • Southwire® Conduit Fill Calc 4

Southwire® Conduit Fill Calc

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.

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Reviews (30)

dou. w. May 25, 2022     

Easy to use . Lets you know when not nec compliant . Fast . Love it .

Aza. S. May 18, 2022     

Very handy to calculate and choose conduits

R.. C. Dec 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.

Chr. E. Nov 7, 2020     

Needed to pull mix of number two and number four aluminum. So much easier than trying to do it through a table or compute manually. Definitely recommend this product.

Eri. B. Apr 21, 2022     

Calculations are wrong. Not sure where they are getting their wire sizes (unless possibly it's spec'd to THEIR brand of wire) but don't use this app or you'll have overfilled pipes you can't pull through.

tod. c. Feb 12, 2020     

I liked this app until I found out it is going to cost my company an extra $25 per foot because it is Wrong! Ran conduit, now I have to pull copper instead of aluminum wire due to fill percentage being way off. Wire diameters are off, and who knows if conduit diameter is off. Back to doing things the old way for me.

Ara. T. Jun 18, 2019     

as an electrician, this is the perfect tool to gauge the correct fill. I would give 10 stars if possible. easy to use and accurate.

DRC. G. Aug 25, 2021     

Simple to operate. No hell's and whistles. Just easy to navigate results.

Aar. b. Jul 21, 2021     

Doesn't change fill percentage for single cable or two cable pulls. It's also concerning how many people say it's not accurate.

Jon. C. Jan 24, 2020     

DO NOT DOWNLOAD OR USE THIS APP. I loved this app until i found out in a bad way that it does not follow NEC wire sizes. According to NEC code you cant fit 4 #12 THHN and 59 #14 THHN in a 1-1/4" conduit under 40% yet this app tells you that you can. If you look at the diameter of the wire and compare to NEC, this app is less then NEC. It just cost me thousands in labor. Do Not use this app until it has been updated.

Pat. O. Jul 26, 2021     

Works very well, easy to use and helped me all the time. Less thinking or looking in code book

Dan. S. Aug 14, 2020     

Is not accurate at all. You will fail your inspections and replace your conduit if you use this app. Its off by almost half

Sta. C. May 4, 2020     

Good, would be better if it incorporated SIS wire because that's mostly what we use where I work.

Bri. W. Sep 12, 2021     

Doesn't offer enough area's to fill for more wire, didn't show arrow to move on to get answer.

Mat. M. Jan 6, 2021     

Great app! Love the ability to add in my own custom conductors with specific diameters

Ste. J. Dec 13, 2019     

Awesome tool allowing us make a complicated calculation simple

Zim. W. Mar 27, 2021     

This is very quick and easy way to find conduit fill.

Ric. C. Oct 4, 2019     

Very accurate to NEC specs,great tool.

Gar. S. Apr 1, 2019     

Very easy to use. Fast and accurate.

Fra. W. Apr 2, 2021     

Works for me. Used it twice to calm some corporate suits worried about a job we were doing.

jer. l. Feb 17, 2020     

NO STARS!!! There is more than just thhn wire. How about fill tables for #16 #18 TFFN.

Asg. A. May 3, 2019     

great app. always using and recommend it to all pro electricians.

Cor. H. Oct 1, 2021     

Very handy app to have four in the field calculations.

Bri. T. Apr 8, 2021     

Awesome super easy to use!!

Jim. H. Nov 21, 2021     

Does not work well on a android

Den. S. Oct 8, 2021     

Great when figuring several gauges for a pull.

Cha. H. Dec 11, 2020     

Very useful and pretty accurate

Mic. Jun 18, 2020     

This is a valuable that'll app does what it's supposed to do and easy to use Nonsense and it's free why would you not give it five stars

Ken. N. May 29, 2019     

Awesome, and easy to use!

Kev. C. Sep 29, 2020     

Can't enter 2nd wire type