Best Conduit Fill Apps

137+ iOS apps curated and reviewed

4.4 avg rating
16 free apps
Updated June 2026

Every iPhone needs a few good conduit fill apps. We benchmark 137+ of them on App Store rating, freshness, and pricing, then surface the standouts so you don't have to scroll the App Store yourself.

Top Picks for Conduit Fill

Southwire® Conduit Fill Calc#1

Southwire® Conduit Fill Calc by Southwire Company

Editor's Choice
🔧 Utilities
4.5😊(679 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
Electrician's Sidekick#2

Electrician's Sidekick by IDEAL INDUSTRIES, INC

Strong Contender
📊 Productivity
3.5(16 ratings)
Free
Electrician's Sidekick screenshot 1
Electrician's Sidekick screenshot 2
Electrician's Sidekick screenshot 3
Electrician's Sidekick screenshot 4
Electrician's Sidekick screenshot 5
Electrician's Sidekick screenshot 6

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.

More Conduit Fill apps to explore

4
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)
5
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)
6
FILL ◦ Conduit Fill Calculator
FILL ◦ Conduit Fill Calculator
FILL ◦ Conduit Fill Calculator
NEC 2023 Conduit Fill by Code
Free
🔧 Utilities
(1)
7
NEC Box & Conduit Calc
NEC Box & Conduit Calc
NEC Box & Conduit Calc
NEC Box & Conduit Fill
Free
🔧 Utilities
(16)
8
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)
9
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
(197)
10
ConduitLab: NEC Calculator
ConduitLab: NEC Calculator
ConduitLab: NEC Calculator
NEC Voltage Drop & Fill Calc
Free
🔧 Utilities
(3)
11
Conduit Filler
Conduit Filler
Conduit Filler
The electrician's helper
Free

This application helps electrical tradespeople with conduit fill calculations and conduit sizing for various wire gauges, providing calculations in accordance with relevant national and international electrical codes. Try it out with a 7-day free trial and subscribe monthly or yearly for unrestricted access to its features.

💼 Business
(16)
12
ConduitFill 3.0
ConduitFill 3.0
ConduitFill 3.0
Conduit Sizing Calculator
$2.99
🔧 Utilities
(0)
13
Ohm's Law
Ohm's Law
Ohm's Law
by Creature Code Mobile, LLC
Free

Calculate electrical values easily with this Ohm's Law Calculator. Input two known values to quickly determine voltage, current, resistance, or power in any electrical circuit. Start calculating now!

🔧 Utilities
(165)
14
Conduit Fill
Conduit Fill
Conduit Fill
quickly calculate conduit fill
$4.99
🔧 Utilities
(2)
15
QuickBend: Conduit Bending
QuickBend: Conduit Bending
QuickBend: Conduit Bending
Conduit Bending Calculator
$6.99

This innovative conduit bending calculator app, designed by an electrician, provides precise measurements for conduit bending while being user-friendly and visually appealing. Suitable for professionals and beginners alike, it offers accurate calculations considering various factors like shoe radius and conduit type, ultimately helping users save time and money with its detailed documentation and intuitive interface.

📊 Productivity
(3.6K)
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
Master Electrician Ref. Lite
Master Electrician Ref. Lite
Master Electrician Ref. Lite
A handbook for electricians
Free

A comprehensive electronic pocket electrician reference guide for electrical professionals and enthusiasts, providing essential information, calculations, NEC tables, and safety manuals. Visit MasterSparky.com for more details and upgrade to the full version for extensive content covering NEC codes over various years.

📊 Productivity
(2.4K)
18
IEC Box & Conduit Calc
IEC Box & Conduit Calc
IEC Box & Conduit Calc
IEC 60364 Sizing Guide
Free
🔧 Utilities
(0)
19
Conduit Fill: NEC Calculator
Conduit Fill: NEC Calculator
Conduit Fill: NEC Calculator
Voltage Drop, Wire & Box Fill
Free
🔧 Utilities
(3)
20
Electrician Tools: Calc & Bend
Electrician Tools: Calc & Bend
Electrician Tools: Calc & Bend
Bend, Size, Fill—All in One
Free
🔍 Reference
(0)

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