Best Conduit Fill Calculator Apps

249+ iOS apps curated and reviewed

4.2 avg rating
15 free apps
Updated August 2026

With an average user rating of 4.2★, the conduit fill calculator category is one of the App Store's strongest. Browse all 249+ apps we track, sorted so the most loved ones surface first.

Compare top Conduit Fill Calculator Apps (August 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1Southwire® Conduit Fill CalcSouthwire® Conduit Fill CalcFree4.5★ (746)NoNoJul 2026
2FILL ◦ Conduit Fill CalculatorFILL ◦ Conduit Fill CalculatorFree4.0★ (3)NoYesJul 2026
3Electrician's SidekickElectrician's SidekickFree3.5★ (16)NoNoMay 2026
4Southwire® Voltage Drop CalcSouthwire® Voltage Drop CalcFree4.6★ (1.5K)NoNoAug 2026
5Conduit Fill Capacity CalculatorConduit Fill Capacity CalculatorFree4.0★ (1)NoNoMay 2026
6Mike Holt's Electrical ToolboxMike Holt's Electrical ToolboxFree4.6★ (197)NoNoJul 2026
7Prysmian Group Conduit FillPrysmian Group Conduit FillFree3.0★ (2)NoNoJul 2026
8Conduit FillConduit Fill$4.993.3★ (3)NoNoAug 2026

Top Picks for Conduit Fill Calculator

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
FILL ◦ Conduit Fill Calculator#2

FILL ◦ Conduit Fill Calculator by James McKinney

NEC 2026 & 2023 Wire Sizing
Strong Contender
🔧 Utilities
4.0(3 ratings)
FreeIn-App Purchases
FILL ◦ Conduit Fill Calculator screenshot 1
FILL ◦ Conduit Fill Calculator screenshot 2
FILL ◦ Conduit Fill Calculator screenshot 3
FILL ◦ Conduit Fill Calculator screenshot 4
FILL ◦ Conduit Fill Calculator screenshot 5

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.

Electrician's Sidekick#3

Electrician's Sidekick by IDEAL INDUSTRIES, INC

Worth Considering
📊 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 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.

More Conduit Fill Calculator apps to explore

4
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
5
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
6
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
7
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
8
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
9
Conduit Fill Calculator-NEC
Conduit Fill Calculator-NEC
Conduit Fill Calculator-NEC
NEC Chapter 9 Pipe Fill
$0.99
🔧 Utilities
(0)
10
Conduit Fill: NEC Calculator +
Conduit Fill: NEC Calculator +
Conduit Fill: NEC Calculator +
Wire, box fill & derating calc
Free
🔧 Utilities
(0)
11
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
12
Conduit Fill Pro
Conduit Fill Pro
Conduit Fill Pro
Capacity Calculator & Code
Free
🔧 Utilities
(0)
13
SIMpull 600V Calculator
SIMpull 600V Calculator
SIMpull 600V Calculator
Southwire Calculator
Free

This app offers multiple calculators for electrical calculations, all linked by wire pull characteristics. It generates NEC® compliant answers for voltage drop, ground wire sizing, ampacity adjustments, and more. Results can be easily emailed.

Voltage Drop CalculatorGround Wire SizingAmpacity Adjustments
🔍 Reference
(59)
free
14
TrueFill: Conduit Fill
TrueFill: Conduit Fill
TrueFill: Conduit Fill
Conduit Fill Calculator
Free
🔧 Utilities
(0)
15
Conduit Fill Pro - Electrician
Conduit Fill Pro - Electrician
Conduit Fill Pro - Electrician
NEC 2023 Conduit Calculator
$2.99
🔧 Utilities
(0)
16
Concrete Calculator Plus
Concrete Calculator Plus
Concrete Calculator Plus
by Inch Calculator
Free

This app provides 15 calculators for estimating concrete, blocks, mortar, rebar, and gravel. It supports various shapes and units, offering material cost estimations for construction projects.

15 concrete estimation calculatorsEstimates cubic yards or bagsCalculates material costs
🔧 Utilities
(21K)
ad-supported
17
WireSpan: Conduit Fill Calc
WireSpan: Conduit Fill Calc
WireSpan: Conduit Fill Calc
NEC Voltage Drop & Wire Size
Free
🔧 Utilities
(0)
18
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
19
Pipe N Wire
Pipe N Wire
Pipe N Wire
Conduit Fill
$1.99

This tool helps electricians quickly calculate the correct conduit size based on wire types, gauges, and desired fill percentages, adhering to NEC standards. It offers a streamlined interface for field use and planning, with options to save calculations and override recommendations.

Conduit fill calculationsSupports all standard wire typesSmart conduit selector
📊 Productivity
(9)
paid
20
BendCalc: Conduit Bending
BendCalc: Conduit Bending
BendCalc: Conduit Bending
Offset, saddle & fill calc
Free

This app provides precise calculations for various conduit bends, eliminating guesswork and material waste. It offers multiple calculator types, supports different benders, and works offline. A free version offers basic calculators, with a one-time purchase unlocking all features.

Precise bend mark calculationsMultiple calculator types (stub-up, offset, saddle)Supports various hand benders with presets
🔧 Utilities
(8)
free with in-app purchases

FAQ about Conduit Fill Calculator

What are the best conduit fill calculator apps for iPhone?
Southwire® Conduit Fill Calc tops our conduit fill calculator apps ranking as of August 2026, with a 4.5-star average from 746 App Store ratings, and it's free to download.
Yes — 15 of the top conduit fill calculator apps we rank are free to download, including Southwire® Conduit Fill Calc and FILL ◦ Conduit Fill Calculator.
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 249+ conduit fill calculator 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.

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