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Best Conduit Fill Apps

215+ iOS apps curated and reviewed

4.1 avg rating
17 free apps
Updated August 2026

Every iPhone needs a few good conduit fill apps. We benchmark 215+ 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 (August 2026)

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

Room to Improve

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

Room to Improve

  • 🐛 Motor starting Voltage drop
  • 🐛 Useless!
  • 🐛 Won't work
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

4
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
5
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
6
Conduit Fill
Conduit Fill
Conduit Fill
quickly calculate conduit fill
$4.99

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.

NEC and CEC code calculationsSupport for up to 1000 wiresSelect from different wire types
🔧 Utilities
(3)
paid
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
Conduit Fill Calculator-NEC
Conduit Fill Calculator-NEC
Conduit Fill Calculator-NEC
NEC Chapter 9 Pipe Fill
$0.99
🔧 Utilities
(0)
9
Conduit Fill: NEC Calculator +
Conduit Fill: NEC Calculator +
Conduit Fill: NEC Calculator +
Wire, box fill & derating calc
Free
🔧 Utilities
(0)
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 & Bending Calc
Conduit Fill & Bending Calc
Conduit Fill & Bending Calc
Box Fill, EMT Bend, Ampacity
Free

This professional calculator helps licensed electricians perform complex NEC code calculations for conduit fill, voltage drop, wire sizing, and more. It offers multiple NEC code years and provides inspector-ready PDF exports with project management features. Designed for offline use in the field.

16 NEC calculatorsNEC year-aware (2017-2026)Inspector citations on results
🔧 Utilities
(3)
free with in-app purchases
12
TrueFill: Conduit Fill
TrueFill: Conduit Fill
TrueFill: Conduit Fill
Conduit Fill Calculator
Free
🔧 Utilities
(0)
13
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
(10)
paid
14
Ohm's Law
Ohm's Law
Ohm's Law
by Creature Code Mobile, LLC
Free

This utility app calculates electrical resistance, voltage, and current using Ohm's Law. It provides a quick and easy way to solve electrical formulas for various applications.

Ohm's Law calculationsVoltage calculationCurrent calculation
🔧 Utilities
(165)
free with in-app purchases
15
Conduit Fill Pro - Electrician
Conduit Fill Pro - Electrician
Conduit Fill Pro - Electrician
NEC 2023 Conduit Calculator
Free
$2.99 | 100% OFF
🔧 Utilities
(0)
16
Mike Holt's Electrical Toolbox
Mike Holt's Electrical Toolbox
Mike Holt's Electrical Toolbox
Electrical Power Calculator
Free

This app provides essential calculations for electricians, inspectors, contractors, and engineers. It helps determine conductor sizing, circuit protection, race sizing, and grounding conductor sizes for various electrical equipment and services.

Conductor sizingVoltage drop limitationsCircuit protection sizing
🔧 Utilities
(197)
free
17
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
18
WireSpan: Conduit Fill Calc
WireSpan: Conduit Fill Calc
WireSpan: Conduit Fill Calc
NEC Voltage Drop & Wire Size
Free
🔧 Utilities
(0)
19
Voltkit: NEC Conduit Fill Calc
Voltkit: NEC Conduit Fill Calc
Voltkit: NEC Conduit Fill Calc
Conduit Bending & Voltage Drop
Free
🔧 Utilities
(0)
20
Conduit Bending with Offset
Conduit Bending with Offset
Conduit Bending with Offset
Bender for EMT, IMC & Re-shape
Free
$4.99 | 100% OFF
🔧 Utilities
(0)

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 August 2026, with a 4.5-star average from 746 App Store ratings, and it's free to download.
Yes — 17 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 August 2026.
We track 215+ conduit fill apps on the iOS App Store as of August 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.

Related searches

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