Southwire® Conduit Fill Calc
Southwire Company Tools
Southwire Conduit Fill Calc calculates Conduit Fill % as per NEC Guidelines.
- Rating
- 4.0
- 375 ratings
- Downloads
- 191K+
- on Google Play
- Price
- Free
- No in-app purchases
- Updated
- Jun 15
- 2026 · v2.5
Screenshots
About 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.
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 2.5 · Updated June 15, 2026
Improved navigation. Added new banner and improved the look of the button that takes you to the user-defined outer diameters screen.
User reviews
Perfect!
Convenient, no ads just answers.
Excellent job 👏 👍
Great app! Love the ability to add in my own custom conductors with specific diameters
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.
Very nice apps thanks
Frequently asked questions
Who created the Southwire Conduit Fill Calc?
Southwire created the Southwire Conduit Fill Calc.
What is the purpose of the Southwire Conduit Fill Calc?
The purpose of the Southwire Conduit Fill Calc is to help electricians, engineers, and contractors determine the appropriate size conduit to use, as per the NEC. It also includes fill percentages and jam probability calculations.
How does the Southwire Conduit Fill Calc work?
The Southwire Conduit Fill Calc works by allowing users to enter the conduit type and size, as well as specify the conductors. The app then calculates the conduit fill percentage according to NEC guidelines.
What company is Southwire?
Southwire Company is the leading manufacturer of wire and cable used in the distribution transmission of electricity in North America.
Can the results from the Southwire Conduit Fill Calc be emailed?
Yes, with one click, you can email the results generated by the Southwire Conduit Fill Calc.
Alternatives to Southwire® Conduit Fill Calc
Looking for apps like Southwire® Conduit Fill Calc? Here are 6 similar Android apps on Google Play. The highest rated is Southwire® Conversion Calc (4.3/5), and all 6 are free to download.
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Southwire Voltage Drop 4.1
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SIMpull 600V Calculator 3.1
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MApp™ 3.1
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Southwire Partial Reel Calc 3.9
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Southwire® Conversion Calc 4.3
| App | Rating | Price | Installs | Last updated | Compare |
|---|---|---|---|---|---|
| Southwire® Conduit Fill Calc | 4.0 / 5 | Free | 100,000+ | Jun 15, 2026 | |
| Southwire Voltage Drop | 4.1 / 5 | Free | 100,000+ | Aug 24, 2026 | Compare |
| Southwire Circuit | – | Free | 5,000+ | Aug 26, 2025 | Compare |
| SIMpull 600V Calculator | 3.1 / 5 | Free | 10,000+ | Jul 21, 2026 | Compare |
| MApp™ | 3.1 / 5 | Free | 5,000+ | Aug 12, 2025 | Compare |
| Southwire Partial Reel Calc | 3.9 / 5 | Free | 10,000+ | Jul 15, 2026 | Compare |
| Southwire® Conversion Calc | 4.3 / 5 | Free | 5,000+ | Aug 24, 2026 | Compare |