Best Conduit Fill Apps

222+ iOS apps curated and reviewed

4.1 avg rating
16 free apps
Updated September 2026

Every iPhone needs a few good conduit fill apps. We benchmark 222+ of them on App Store rating, freshness, and pricing, then surface the standouts so you don't have to scroll the App Store yourself.

Compare top Conduit Fill Apps (September 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1Southwire® Conduit Fill CalcSouthwire® Conduit Fill CalcFree4.5★ (746)NoNoSep 2026
2Southwire® Voltage Drop CalcSouthwire® Voltage Drop CalcFree4.6★ (1.5K)NoNoSep 2026
3Conduit Fill ProConduit Fill ProFree3.7★ (3)NoYesAug 2026
4Conduit FillConduit Fill$4.993.3★ (3)NoNoAug 2026
5FILL ◦ Conduit Fill CalculatorFILL ◦ Conduit Fill CalculatorFree4.0★ (3)NoYesSep 2026
6Electrician's SidekickElectrician's SidekickFree3.5★ (16)NoNoMay 2026
7Conduit Fill Calculator-NECConduit Fill Calculator-NEC$0.99YesYesAug 2026
8Prysmian Group Conduit FillPrysmian Group Conduit FillFree3.0★ (2)NoNoSep 2026

Top Picks for 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 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.

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
  • 💾 Customizable wire data entry
  • ⚡ Saves significant time on job sites
  • 🎯 Accurate calculations (when working properly)
  • 📱 Convenient mobile access to conduit fill information

Room to Improve

  • ⚠️ 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
Southwire® Voltage Drop Calc#2

Southwire® Voltage Drop Calc by Southwire Company

Southwire Calculator
Strong Contender
🔧 Utilities
4.6😐(1.5K ratings)
Free
Southwire® Voltage Drop Calc screenshot 1
Southwire® Voltage Drop Calc screenshot 2
Southwire® Voltage Drop Calc screenshot 3
Southwire® Voltage Drop Calc screenshot 4
Southwire® Voltage Drop Calc screenshot 5
Southwire® Voltage Drop Calc screenshot 6

Calculate the appropriate wire size for electrical circuits. This tool helps determine wire size based on voltage drop and current carrying capacity, ensuring compliance with NEC ampacity limits.

What We Love

  • 🚀 Quick and useful
  • 🚀 Great Quick Reference
  • 👍 A must have app for electricians
  • 👍 Love These
  • 👍 Electrical Engineer
  • 👍 Awesome app
  • 👍 Safer
  • 👍 Useful
  • 👍 Handy
  • 👍 Great App
  • 👍 Dependable app
  • 👍 Electrician tech
  • 👍 Solid and simple to use app
  • 👍 Great app

Room to Improve

  • 🐛 Motor starting Voltage drop
  • 🐛 Useless!
  • 🐛 Won't work
  • 🐛 How to use
  • 🐛 Confused
  • 🐛 Bad app
  • 🐛 Bad
  • 🐛 Not applicable for Residential
  • 🐛 Electrician
  • 🐛 Terrible
  • 🐛 Not working
  • 🐛 What??
  • 🐛 Terrible
  • 🐛 Don't work
  • 🐛 Terrible
  • 🐛 Choice Between AWG and Metric wire Gauge
  • 🐛 Updated app not so simple
  • 🐛 The last version was better
  • 🐛 App
  • 🐛 Terrible
  • 🐛 Voltage drop calculator
  • 🐛 IOS 8
  • 🐛 One flaw
  • 🐛 Worst app ever
  • 🐛 Average
Conduit Fill Pro#3

Conduit Fill Pro by Mikhail Nikitin

Capacity Calculator & Code
Worth Considering
🔧 Utilities
3.7(3 ratings)
FreeIn-App Purchases
Conduit Fill Pro screenshot 1
Conduit Fill Pro screenshot 2
Conduit Fill Pro screenshot 3
Conduit Fill Pro screenshot 4
Conduit Fill Pro screenshot 5
Conduit Fill Pro screenshot 6

This app provides professional electricians with a suite of tools for electrical calculations, including conduit fill, junction box fill, and voltage drop. It offers detailed breakdowns, code references, and offline functionality for job site reliability. Generate PDF reports for documentation and inspections.

More Conduit Fill apps to explore

FAQ about Conduit Fill

What are the best conduit fill apps for iPhone?
Southwire® Conduit Fill Calc tops our conduit fill apps ranking as of September 2026, with a 4.5-star average from 746 App Store ratings, and it's free to download.
Yes — 16 of the top conduit fill apps we rank are free to download, including Southwire® Conduit Fill Calc and Southwire® Voltage Drop Calc.
Southwire® Conduit Fill Calc has no ads and has no in-app purchases, according to its App Store listing as of September 2026.
We track 222+ conduit fill apps on the iOS App Store as of September 2026, ranked by rating, recency, and analysis of real user reviews.
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?'
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.

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