Best Electrical Conduit Fill Apps

192+ iOS apps curated and reviewed

4.4 avg rating
16 free apps
Updated June 2026

Southwire® Conduit Fill Calc is the household name in electrical conduit fill, but it's far from the only option. We track 192+ alternatives and competitors on iOS — many free, many higher-rated than you'd expect.

Top Picks for Electrical Conduit Fill

Southwire® Conduit Fill Calc#1

Southwire® Conduit Fill Calc by Southwire Company

Editor's Choice
🔧 Utilities
4.5😊(746 ratings)
Free
Southwire® Conduit Fill Calc screenshot 1
Southwire® Conduit Fill Calc screenshot 2
Southwire® Conduit Fill Calc screenshot 3

This application helps electricians, engineers, and contractors quickly determine the proper conduit size to use based on NEC guidelines, including fill percentages and jam probability. Simply input conduit type, size, and conductors, and the app will calculate the conduit fill percentage for you.

What We Love

  • 🚀 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

Room to Improve

  • ⚠️ Accuracy issues reported by multiple users
  • ❌ Limited wire gauge options (missing 16 & 18 AWG)
  • 🔄 Changing conduit type erases conduit size
Electrical Toolkit by HCP#3

Electrical Toolkit by HCP by Codefied Inc.

Conduit + load calcs for pros
Worth Considering
🔧 Utilities
4.8(18 ratings)
Free
Electrical Toolkit by HCP screenshot 1
Electrical Toolkit by HCP screenshot 2
Electrical Toolkit by HCP screenshot 3
Electrical Toolkit by HCP screenshot 4
Electrical Toolkit by HCP screenshot 5
Electrical Toolkit by HCP screenshot 6

A comprehensive electrical calculator and conduit bending tool designed for professionals, providing common calculations and conversions in a clean and simple interface for efficient work. Download it to streamline your electrical work and stay ahead with upcoming updates adding more tools.

More Electrical Conduit Fill apps to explore

4
Conduit Fill Capacity Calculator
Conduit Fill Capacity Calculator
Conduit Fill Capacity Calculator
by TE Connectivity Corporation
Free

This application helps you determine the maximum number of data cables that can fit in a conduit of a specific size, based on a chosen fill ratio. Try it out to easily calculate conduit fill capacity and plan your cable management efficiently.

🔧 Utilities
(1)
5
FILL ◦ Conduit Fill Calculator
FILL ◦ Conduit Fill Calculator
FILL ◦ Conduit Fill Calculator
NEC 2023 Conduit Fill by Code
Free
🔧 Utilities
(1)
6
Prysmian Group Conduit Fill
Prysmian Group Conduit Fill
Prysmian Group Conduit Fill
Electrical Conduit Fill
Free

This electrical conduit fill calculator helps engineers, contractors, and electrical professionals quickly determine the minimum conduit size according to the National Electrical Code, saving time on complex calculations. Try it out to easily find answers for your conduit fill needs.

📊 Productivity
(2)
7
Mike Holt's Electrical Toolbox
Mike Holt's Electrical Toolbox
Mike Holt's Electrical Toolbox
Electrical Power Calculator
Free

An industry-leading electrical power calculator app designed by Mike Holt for electricians, inspectors, contractors, and engineers. Perform conductor sizing, circuit protection, race sizing, and more with this practical and useful tool.

🔧 Utilities
(198)
8
Ugly's Electrical References
Ugly's Electrical References
Ugly's Electrical References
by Informed Publishing
$12.99

This app is a comprehensive electrical reference guide that has been updated to align with the 2020 National Electrical Code. It offers a range of features such as calculators, interactive tools, and in-depth information for electricians, making it a valuable on-the-job resource.

📊 Productivity
(1)
9
Southwire® Voltage Drop Calc
Southwire® Voltage Drop Calc
Southwire® Voltage Drop Calc
Southwire Calculator
Free

Calculate the right wire size for your electrical circuit with this voltage drop calculator. Ensure proper conductivity while meeting specific voltage drop limits and NEC ampacity standards. Perfect for AWG and KCMIL sizes in various applications.

🔧 Utilities
(1.4K)
10
Electrician's Sidekick
Electrician's Sidekick
Electrician's Sidekick
by IDEAL INDUSTRIES, INC
Free

This free tool combines multiple electrical calculators into one convenient app, allowing electricians to efficiently and accurately complete tasks such as conduit bending, wire sizing, and voltage drop calculations. With its various calculators and features, it helps electricians maximize their fieldwork efficiency and accuracy, and is available for use even without internet connectivity.

📊 Productivity
(16)
11
Conduit Fill: NEC Calculator
Conduit Fill: NEC Calculator
Conduit Fill: NEC Calculator
Voltage Drop, Wire & Box Fill
Free
🔧 Utilities
(3)
12
Wire Color Code
Wire Color Code
Wire Color Code
Electrical circuit colors
Free

Discover a must-have electrical circuit color app designed for both professionals and DIY enthusiasts. Access accurate wire color codes specific to your country, explore a vast circuit database, utilize quick search functionality, and customize colors for your projects. Stay compliant, efficient, and organized with this user-friendly tool. Download now for a convenient solution to all your circuit identification needs.

📊 Productivity
(654)
13
FieldVolt Electrical
FieldVolt Electrical
FieldVolt Electrical
by MATTHEW DAVID KOVALIK
Free
🔧 Utilities
(0)
14
Electrical Code-A-Day
Electrical Code-A-Day
Electrical Code-A-Day
Quiz for Electricians
Free

Put your electrical knowledge to the test with this daily quiz app for electricians! Answer a new question each day or binge-answer them all at once. Perfect for apprentices, journeymen, and masters looking to sharpen their skills or refresh their knowledge. Lightning-fast learning on all things electrical!

📊 Productivity
(8.6K)
15
Conduit Bender Elite - Calc
Conduit Bender Elite - Calc
Conduit Bender Elite - Calc
Calculator for Electricians
$7.99

An essential calculator designed for Electricians, the Conduit Bender Elite™ simplifies conduit bending by providing step-by-step guidance and support for various bends. It offers a wide range of bend types and optional digital level functionality to streamline installations, with customizable preference settings for different conduit sizes. Email techsupport@cyberprodigy.com for assistance or suggestions for future enhancements.

🔧 Utilities
(1.6K)
16
Derated: Conduit Fill
Derated: Conduit Fill
Derated: Conduit Fill
Fill and Derating Calculator
$1.99

This conduit fill calculator app simplifies complex electrical calculations, allowing users to effortlessly calculate conduit fill and derate wires' ampacity in real-time, adhering to National Electric Code guidelines. With an intuitive interface, users can easily set up calculations, share results, and collaborate with others, streamlining communication and ensuring accurate results.

📊 Productivity
(5)
17
Conduit Fill
Conduit Fill
Conduit Fill
quickly calculate conduit fill
$4.99
🔧 Utilities
(2)
18
SLD Sizer for Engineering
SLD Sizer for Engineering
SLD Sizer for Engineering
Single Line - One Line Diagram
Free

This reference tool helps electrical engineers, designers, and contractors verify wire and conduit sizes based on selected load, providing minimum requirements according to the NEC. It serves as a quick guide for designing or verifying electrical installations and drawings.

🔍 Reference
(7)
19
Box Fill Pro
Box Fill Pro
Box Fill Pro
by Intineo LLC
Free

This application calculates electrical wiring box fill requirements with detailed breakdowns by wire size and component, offering features like cable mode and easy result sharing. Try it out to simplify your electrical wiring calculations and get accurate results quickly.

📊 Productivity
(4)
20
ElectricalWiringPro
ElectricalWiringPro
ElectricalWiringPro
by Intineo LLC
Free

This application provides electrical code and design calculators for professionals working with wiring systems, including electricians, engineers, and others. It offers a range of calculations and tools, such as ampacity and wire size calculators, box and conduit fill calculators, and more, to help users with their daily work.

📊 Productivity
(8)