Best Southwire Conduit Fill Apps

127+ iOS apps curated and reviewed

4.0 avg rating
16 free apps
Updated July 2026

Every iPhone needs a few good southwire conduit fill apps. We benchmark 127+ 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 Southwire Conduit Fill Apps (July 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1Southwire® Conduit Fill CalcSouthwire® Conduit Fill CalcFree4.5★ (746)NoNoAug 2026
2Conduit FillConduit Fill$4.993.3★ (3)NoNoAug 2026
3TrueFill: Conduit FillTrueFill: Conduit FillFreeNoNoJul 2026
4Derated: Conduit FillDerated: Conduit Fill$1.994.8★ (5)NoNoJul 2026
5Conduit Fill Pro - ElectricianConduit Fill Pro - Electrician$2.99NoYesJun 2026
6Southwire® Voltage Drop CalcSouthwire® Voltage Drop CalcFree4.6★ (1.5K)NoNoAug 2026
7Conduit Fill Capacity CalculatorConduit Fill Capacity CalculatorFree4.0★ (1)NoNoMay 2026
8FILL ◦ Conduit Fill CalculatorFILL ◦ Conduit Fill CalculatorFree4.0★ (3)NoYesJul 2026

Top Picks for Southwire 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

Room to Improve

  • ⚠️ Accuracy issues reported by multiple users
  • ❌ Limited wire gauge options (missing 16 & 18 AWG)
  • 🔄 Changing conduit type erases conduit size
Conduit Fill#2

Conduit Fill by Martin Loch

quickly calculate conduit fill
Strong Contender
🔧 Utilities
3.3(3 ratings)
$4.99
Conduit Fill screenshot 1
Conduit Fill screenshot 2
Conduit Fill screenshot 3
Conduit Fill screenshot 4
Conduit Fill screenshot 5

This app helps electricians quickly calculate conduit fill based on the latest NEC or CEC codes. Easily add various wire types and quantities to determine the minimum required conduit size.

More Southwire Conduit Fill apps to explore

4
Derated: Conduit Fill
Derated: Conduit Fill
Derated: Conduit Fill
Fill and Derating Calculator
$1.99

This app simplifies complex electrical calculations for electricians. It allows real-time calculation of conduit fill and wire ampacity derating, adhering to NEC guidelines. Results are accurate and easily shareable for collaboration or client communication.

Real-time conduit fill calculationSimultaneous wire ampacity deratingAdheres to NEC guidelines
📊 Productivity
(5)
paid
5
Conduit Fill Pro - Electrician
Conduit Fill Pro - Electrician
Conduit Fill Pro - Electrician
NEC 2023 Conduit Calculator
$2.99
🔧 Utilities
(0)
6
Southwire® Voltage Drop Calc
Southwire® Voltage Drop Calc
Southwire® Voltage Drop Calc
Southwire Calculator
Free

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.

Determine wire size for voltage dropCalculate voltage drop for conductor runsLimit wire size by voltage drop
🔧 Utilities
(1.5K)
free
7
Conduit Fill Capacity Calculator
Conduit Fill Capacity Calculator
Conduit Fill Capacity Calculator
by TE Connectivity Corporation
Free

Easily determine the maximum number of data cables that can fit within a conduit of a specific size. Input your conduit dimensions and desired fill ratio to get an instant calculation.

Calculate maximum cable capacitySelect conduit sizeChoose fill ratio
🔧 Utilities
(1)
free
8
FILL ◦ Conduit Fill Calculator
FILL ◦ Conduit Fill Calculator
FILL ◦ Conduit Fill Calculator
NEC 2026 & 2023 Wire Sizing
Free

This app calculates conduit fill percentages based on NEC 2023 standards. It helps electricians determine if wires will fit in a conduit or find the smallest suitable conduit for a given set of wires. Features include real-time status updates, history, and export options.

NEC 2023 compliant calculationsForward and reverse calculation modesReal-time fill percentage status
🔧 Utilities
(3)
free with in-app purchases
9
Southwire Circuit
Southwire Circuit
Southwire Circuit
by Southwire Company
Free

This app serves as an official communication channel, delivering breaking news and task reminders via push notifications. Users can share various media types, personalize their experience with profiles, and easily save and find important information through search and bookmarking.

Official communication sourcePush notifications for news and tasksUpload and share videos, photos, documents
💼 Business
(3)
free
10
Prysmian Group Conduit Fill
Prysmian Group Conduit Fill
Prysmian Group Conduit Fill
Electrical Conduit Fill
Free

This tool quickly calculates the minimum conduit size required for electrical projects based on National Electrical Code standards. It supports various conductor types, insulation, and conduit options, providing essential fill data for professionals.

NEC code selection (2011, 2014, 2017)Metric or standard conductorsAllowable fill rates
📊 Productivity
(2)
free
11
Conduit Fill: NEC Calculator +
Conduit Fill: NEC Calculator +
Conduit Fill: NEC Calculator +
Wire, box fill & derating calc
Free
🔧 Utilities
(0)
12
NEC Box & Conduit Calc
NEC Box & Conduit Calc
NEC Box & Conduit Calc
NEC Box & Conduit Fill
Free

Calculate electrical box and conduit fill accurately according to the NEC. This app provides instant, reliable calculations for electricians, contractors, and students, saving time on job sites. It offers support for various box and conduit types, conductor sizes, and includes wire volume data.

Box fill calculationsConduit fill calculationsWire volume data
🔧 Utilities
(18)
free with in-app purchases
13
Southwire® Conversion Calc
Southwire® Conversion Calc
Southwire® Conversion Calc
Southwire
Free

This utility app facilitates conversions between copper and aluminum electrical wiring. It allows users to calculate pricing, unit of measure, conversion factors, and weight based on product length. The app comes preloaded with numerous cable types for easy calculation.

Copper to aluminum conversionAluminum to copper conversionPricing unit of measure calculation
🔧 Utilities
(5)
free
14
Electrician's Sidekick
Electrician's Sidekick
Electrician's Sidekick
by IDEAL INDUSTRIES, INC
Free

This free tool consolidates essential electrical calculations and reference guides into a single app. It offers precise tools for conduit bending, wire sizing, voltage drop, and conduit fill, designed to enhance fieldwork efficiency and accuracy for professionals. The app functions offline, ensuring constant access to critical information.

Conduit bending calculatorWire sizing and voltage drop calculatorConduit fill calculator
📊 Productivity
(16)
free
15
Conduit Filler
Conduit Filler
Conduit Filler
The electrician's helper
Free

This app assists electrical tradespeople with conduit fill and sizing calculations for various wire gauges. It supports US, Canadian, and UK electrical codes, offering a 7-day free trial before a monthly or yearly subscription.

Conduit fill calculationsConduit sizing calculationsSupports US, Canadian, and UK codes
💼 Business
(16)
subscription
16
Conduit Fill Calculator-NEC
Conduit Fill Calculator-NEC
Conduit Fill Calculator-NEC
NEC Chapter 9 Pipe Fill
$0.99
🔧 Utilities
(0)
17
Conduit Fill Pro
Conduit Fill Pro
Conduit Fill Pro
Capacity Calculator & Code
Free
🔧 Utilities
(0)
18
Box Fill Pro
Box Fill Pro
Box Fill Pro
by Intineo LLC
Free

This app simplifies electrical wiring box fill calculations with detailed breakdowns by wire size and component. It offers an optional cable counting mode and includes volumes for standard boxes and plaster rings for quick reference. Results are displayed on a single screen for easy access and can be shared via email.

Detailed wire size and component calculationsOptional cable counting modeStandard box and plaster ring volumes
📊 Productivity
(4)
free
19
Southwire® MCAP® Savings Calc
Southwire® MCAP® Savings Calc
Southwire® MCAP® Savings Calc
Southwire Calculator
Free

Calculate potential labor cost savings when using a specific type of cable compared to traditional alternatives. This tool estimates savings in time and money based on project details like the number of outlets and fixtures. Results can be emailed.

Estimate labor cost savingsCompare MCAP vs. traditional cableCalculate savings in time and dollars
🔧 Utilities
(4)
free
20
WireSpan: Conduit Fill Calc
WireSpan: Conduit Fill Calc
WireSpan: Conduit Fill Calc
NEC Voltage Drop & Wire Size
Free
🔧 Utilities
(0)

FAQ about Southwire Conduit Fill

What are the best southwire conduit fill apps for iPhone?
Southwire® Conduit Fill Calc tops our southwire conduit fill apps ranking as of July 2026, with a 4.5-star average from 746 App Store ratings, and it's free to download.
Yes — 16 of the top southwire conduit fill apps we rank are free to download, including Southwire® Conduit Fill Calc and TrueFill: Conduit Fill.
Southwire® Conduit Fill Calc has no ads and has no in-app purchases, according to its App Store listing as of July 2026.
We track 127+ southwire conduit fill apps on the iOS App Store as of July 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.