1. Home
  2. 🔧 Utilities
  3. Southwire® Conduit Fill Calc
Southwire® Conduit Fill Calc

Southwire® Conduit Fill Calc

by Southwire Company

770 ratings
47 reviews
🔧 Utilities
💼 Business
Free

Details

Released
March 19, 2012
Updated
October 14, 2026

Features

Developer

Southwire Company
✨Promote your app ✨
Southwire® Conduit Fill Calc screenshot #1 for iPhone
Southwire® Conduit Fill Calc screenshot #2 for iPhone
Southwire® Conduit Fill Calc screenshot #3 for iPhone
iphone
ipad
📌Ready
Reviews summary↘︎
⭐47
Reviews↘︎
📝31+ tags
Tags↘︎
🔄6+ apps
Alternatives↘︎
❓5 answered
FAQ↘︎
📦~ in 4 weeks
Updates frequency↘︎
🖼️Get Icon
Icons↘︎

About

This tool assists electricians, engineers, and contractors in determining the correct conduit size based on NEC guidelines. It calculates conduit fill percentages and jam probability, saving time compared to manual calculations.

✓Conduit size calculation
✓NEC fill percentages
✓Jam probability
✓Email results
✓Quick navigation
Show original description

What users say about Southwire® Conduit Fill Calc

Reviews of Southwire® Conduit Fill Calc are mostly positive: the Utilities app is rated 4.5/5 from 770 App Store ratings. What users like most: quick and easy calculations, user-friendly interface with spin wheel controls. Top complaints: accuracy issues reported by multiple users, limited wire gauge options (missing 16 & 18 AWG). Summarized from real user reviews.

Positive things

  • 🚀Quick and easy calculations
  • 👍User-friendly interface with spin wheel controls
  • 📊Shows actual fill percentage and NEC compliance
  • 🔧Ability to add multiple wire sizes simultaneously
  • 💾Customizable wire data entry
  • ⚡Saves significant time on job sites
  • 🎯Accurate calculations (when working properly)
  • 📱Convenient mobile access to conduit fill information

Negative things

  • ⚠️Accuracy issues reported by multiple users
  • ❌Limited wire gauge options (missing 16 & 18 AWG)
  • 🔄Changing conduit type erases conduit size
  • 📉Jam probability calculations unreliable
  • 🗑️No data persistence between calculations
  • 🐛Blank screen crashes on older versions
  • ⚠️Discrepancies with NEC standards calculations
See all reviews

What's New in Southwire® Conduit Fill Calc

2.5.1

October 14, 2026

Minor bug fixes.

User reviews

Most RecentHighest RatedLowest Rated

Awesome app

Quick and easy. Can’t mess it up. That’s what you need in the field.
SShoTime41O

Florida

My go to app for quick calculations
D8Dave 810

Good but slightly off

Love the app except I’ve had others check me after I’ve used and found a small deficiency of accuracy not severe
TTannerwj

Basically Worthless

The reason I say this is because we work with 0-10 lightning controls a lot, which means that without 16 & 18 awg, this utility is incomplete. Disappointing really…
MMrSparkie63

Amazing

This app is simple to use and works. Ask Google about wire fill and you get an answer based on people’s opinion which is mostly wrong. This app calculates it and you know exactly if you’re good to go or not.
RRMTFamily
See 42 more reviews

Developer apps

Southwire® Voltage Drop Calc
Southwire® Voltage Drop Calc

Southwire Calculator

🔧 Utilities

(1.5K)

Free
Partial Reel Calculator
Partial Reel Calculator

Southwire

🔧 Utilities

(14)

Free
Southwire® MCAP® Savings Calc
Southwire® MCAP® Savings Calc

Southwire Calculator

🔧 Utilities

(4)

Free
Proof Positive© Copper
Proof Positive© Copper

by Southwire Company

🔧 Utilities

(2)

Free
Southwire® Conversion Calc
Southwire® Conversion Calc

Southwire

🔧 Utilities

(5)

Free
See developer apps

User experience

🐞

Reported Bugs

6 issues

Blank white screen on app launch

Bug

Conduit size data erased when changing conduit type

Bug

Inaccurate fill calculations compared to NEC standards

Bug

Jam probability calculations not accurate

Bug

App crashes and fails to display results

Bug

No method to reload or recover from crashes

Bug
✨

Requested Features

8 requests

Add 16 & 18 AWG wire sizes

Feature

Include bare solid copper and other conductor types

Feature

Save calculation history/results

Feature

Voltage drop calculator

Feature

Maximum wire count per conduit type calculator

Feature

Conduit length parameter

Feature

Restore calculate button functionality

Feature

Auto-fill missing fields

Feature

FAQ

What does the Conduit Fill Calc app do?

This app helps electricians, engineers, and contractors determine the correct conduit size by calculating the conduit fill percentage and jam probability according to NEC guidelines. It simplifies the process of answering the question, 'What size conduit do I use?'

What are the key features of this app?

Key features include calculating conduit fill percentages and jam probability based on NEC guidelines, easy navigation, and the ability to email your calculation results with a single click. It eliminates the need for manual calculations or referencing the NEC book.

Is this app free to use?

Yes, the application is provided for free. There are no in-app purchases or advertisements mentioned, indicating it is a completely free utility.

What information do I need to use the app?

To use the app, you will need to enter the Conduit Type and Size, and then specify your conductors. The app will then calculate the Conduit Fill % as per NEC Guidelines.

Who is this app designed for?

This app is specifically designed for professionals in the electrical industry, including electricians, engineers, and contractors who regularly need to calculate conduit fill and ensure compliance with NEC standards.