Best Wire Derating Apps

0+ iOS apps curated and reviewed

4.4 avg rating
14 free apps
Updated July 2026

Southwire® Voltage Drop Calc is the household name in wire derating, but it's far from the only option. We track 0+ alternatives and competitors on iOS — many free, many higher-rated than you'd expect.

Compare top Wire Derating Apps (July 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1Southwire® Voltage Drop CalcSouthwire® Voltage Drop CalcFree4.6★ (1.5K)NoNoAug 2026
2Derated: Conduit FillDerated: Conduit Fill$1.994.9★ (10)NoNoAug 2026
3Panduit Derate-ItPanduit Derate-ItFree5.0★ (1)NoNoMay 2026
4Voltage Drop Calculator.Voltage Drop Calculator.Free4.6★ (412)YesYesAug 2026
5Wire Size CalcWire Size Calc$0.99NoYesAug 2026
6Wire Color CodeWire Color CodeFree4.6★ (999)NoYesAug 2026
7E-Wire CalcE-Wire CalcFree5.0★ (1)NoNoAug 2026
8Circuit WizardCircuit WizardFree3.1★ (19)NoNoMay 2026

Top Picks for Wire Derating

Southwire® Voltage Drop Calc#1

Southwire® Voltage Drop Calc by Southwire Company

Southwire Calculator
Editor's Choice
🔧 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
Derated: Conduit Fill#2

Derated: Conduit Fill by Bret Hardman

Fill and Derating Calculator
Strong Contender
📊 Productivity
4.9(10 ratings)
$1.99
Derated: Conduit Fill screenshot 1
Derated: Conduit Fill screenshot 2
Derated: Conduit Fill screenshot 3
Derated: Conduit Fill screenshot 4
Derated: Conduit Fill screenshot 5
Derated: Conduit Fill screenshot 6

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.

Panduit Derate-It#3

Panduit Derate-It by Panduit Corp.

Worth Considering
📊 Productivity
5.0(1 ratings)
Free
Panduit Derate-It screenshot 1
Panduit Derate-It screenshot 2

This tool helps determine the maximum allowable lengths for twisted-pair copper patch and horizontal cables in compliant Category 5e, 6, or 6A channels. It allows users to define cables, create multi-cable channels, and validates configurations, providing guidance on length adjustments.

More Wire Derating apps to explore

4
Voltage Drop Calculator.
Voltage Drop Calculator.
Voltage Drop Calculator.
Wire Size, NEC & IEC Tools
Free

Calculate voltage drop and wire size using both NEC and IEC standards. Supports various load types, conductor materials, and system configurations. Generates detailed reports for electricians, engineers, and contractors.

NEC and IEC dual standardsVoltage drop and wire sizing calculationsSupport for continuous load and corrections
🔧 Utilities
(412)
free with in-app purchases
5
Wire Size Calc
Wire Size Calc
Wire Size Calc
NEC Ampacity & Derating
$0.99
🔧 Utilities
(0)
6
Wire Color Code
Wire Color Code
Wire Color Code
Electrical circuit colors
Free

This app helps electricians and DIYers identify electrical wire colors globally. It offers country-specific codes, a large circuit database, and quick search functionality. Customize colors for your projects and enjoy a user-friendly interface for efficient electrical panel wiring.

Global country-specific wire color codesExtensive circuit database (up to 1000 circuits)Quick search for phase colors
📊 Productivity
(999)
free with in-app purchases
7
E-Wire Calc
E-Wire Calc
E-Wire Calc
by Elektrisola Dr. Gerd Schildbach GmbH & Co. KG
Free

This tool helps determine technical characteristics of enamelled copper wire based on industry standards. It offers functions for diameter conversion, resistance calculations, and breakdown voltage.

Diameter conversion (mm, inch, AWG)Resistance calculationMetal wire diameter calculation
🔧 Utilities
(1)
free
8
Circuit Wizard
Circuit Wizard
Circuit Wizard
by Blue Sea Systems, Inc.
Free

This app assists electricians and enthusiasts in calculating wire sizes for installations based on ABYC and Blue Sea Systems specifications. It also helps find suitable protective products for circuits. The application functions completely offline.

Wire sizing calculationABYC and Blue Sea Systems specificationsProduct search for circuit protection
🔍 Reference
(19)
free
9
Lead Wire Ampacity
Lead Wire Ampacity
Lead Wire Ampacity
Southwire Calculator
Free
🔧 Utilities
(0)
10
AWG Convert
AWG Convert
AWG Convert
by Nelcea
Free

Easily convert wire sizes between American Wire Gauge (AWG) and metric/imperial units. Get diameter and cross-sectional area for your wiring needs.

AWG to metric conversionAWG to imperial conversionDiameter calculation
🔧 Utilities
(0)
free
11
Esteves Eddie Wire Solutions
Esteves Eddie Wire Solutions
Esteves Eddie Wire Solutions
Esteves Group
Free

This advanced tool transforms your device into a user-friendly wire drawing calculator. It offers precision for wire customization, automatic string calculations, production optimization, and unit conversions. Professionals can easily share results and customize settings for an enhanced workflow.

Wire customization and die size sequence creationAutomatic elongation string calculationsProduction length and weight estimation
🔧 Utilities
(7)
free
12
Building Wire Selector
Building Wire Selector
Building Wire Selector
Southwire Calculator
Free

This tool helps determine the correct conductor size and wire type for electrical installations. It adheres to the National Electrical Code® wiring methods, ensuring compliance and safety.

Conductor size determinationWire and cable type selectionNational Electrical Code compliance
🔧 Utilities
(2)
free
13
DC Wire Sizer
DC Wire Sizer
DC Wire Sizer
Easy Wire Sizing Calculator!
$2.99

Calculate appropriate DC wire sizes for electrical projects, preventing equipment damage and fires. Save, edit, and export wire run details for electrical plans and material purchases. Features a wizard for easy sizing for all users.

Calculates wire size, voltage drop, and ampacitySupports custom DC voltages up to 500 ampsSave, edit, and export wire run details
🔧 Utilities
(21)
paid
14
Phased: Circuit Colors
Phased: Circuit Colors
Phased: Circuit Colors
Electrical Wire Reference App
$0.99

This app helps electricians quickly identify the correct wire colors for various electrical phasing jobs. It offers selections for three-phase and single-phase systems, with adjustable color settings that are remembered for future use.

Three-phase 120/208V wire colorsThree-phase 277/480V wire colorsSingle-phase wire colors
📊 Productivity
(13)
paid
15
Wire Gauge Charts - Size tables for AWG, SWG, BWG
Wire Gauge Charts - Size tables for AWG, SWG, BWG
Wire Gauge Charts - Size tables for AWG, SWG, BWG
by Chewy Applications
$0.99

Access comprehensive wire gauge charts for AWG, SWG, and BWG. Quickly find diameter, area, resistance, and weight values for various wire types with easy scrolling or a search bar. Includes comparison tables and specific data for aluminum and copper wires.

Wire gauge charts (AWG, SWG, BWG)Diameter, area, resistance, weight valuesComparison tables
🔍 Reference
(4)
paid
16
Wire Gauge & Size Calculator
Wire Gauge & Size Calculator
Wire Gauge & Size Calculator
AWG & mm² · Voltage Drop, Amps
Free

This utility app calculates the minimum wire size needed for electrical installations based on voltage, current, distance, and allowable voltage drop. It supports various units and wire materials, ensuring safe and efficient power distribution for diverse applications.

Calculates minimum wire gaugeSupports voltage drop percentageMultiple wire size units (AWG, mm, mm², inches)
🔧 Utilities
(13)
ad-supported
17
WireSizer - DC Voltage Drop
WireSizer - DC Voltage Drop
WireSizer - DC Voltage Drop
DC Wire Size Calculator
$4.99

This app quickly calculates the correct DC wire gauge needed for any circuit. Simply input voltage, current, and length to determine the optimal wire size, considering voltage drop and ampacity limits. It's suitable for various DC systems up to 60 VDC.

Instant DC wire size calculationVoltage drop percentage selectionAmpacity limit checks
🔧 Utilities
(224)
paid
18
Wire (AWG) Calculator
Wire (AWG) Calculator
Wire (AWG) Calculator
A&P Mechanic Toolbox
Free

This app assists aircraft mechanics in selecting the correct American Wire Gauge (AWG) for aircraft wiring. It calculates wire size based on circuit length, current, voltage, temperature, and derating factors, referencing FAA guidelines.

AWG wire size calculationVoltage, current, and length inputsTemperature and derating factors
🔍 Reference
(6)
free
19
Electrical Wiring Pro 2017
Electrical Wiring Pro 2017
Electrical Wiring Pro 2017
Calcs, Refs - Electrical Pros
Free

This app provides electrical calculations and references based on the 2017 Electrical Code. It supports multiple code versions and offers features for wire sizing, box fill, conduit fill, residential load calculations, and voltage drop.

2017 Electrical Code supportAmpacity and wire sizingBox fill and wire bending space
📊 Productivity
(32)
free
20
Wire Gauge Calculator
Wire Gauge Calculator
Wire Gauge Calculator
by Paul Pollock
Free

Calculate wire resistance based on gauge and length. It also determines the minimum wire gauge required for specific voltage drop, length, and material.

Calculate wire resistanceDetermine minimum wire gaugeInput wire gauge and length
🔧 Utilities
(1)
free

FAQ about Wire Derating

What are the best wire derating apps for iPhone?
Southwire® Voltage Drop Calc tops our wire derating apps ranking as of July 2026, with a 4.6-star average from 1.5K App Store ratings, and it's free to download.
Yes — 14 of the top wire derating apps we rank are free to download, including Southwire® Voltage Drop Calc and Panduit Derate-It.
Southwire® Voltage Drop Calc has no ads and has no in-app purchases, according to its App Store listing as of July 2026.
This app helps you determine the correct wire size for electrical circuits. It calculates the appropriate wire size based on specified voltage drop limits and the current carrying capacity (ampacity) of the circuit, ensuring compliance with National Electrical Code (NEC) standards.
The app allows you to determine the wire size needed to meet specific voltage drop limits. It can also calculate the voltage drop for a given conductor run. Calculations are limited by both voltage drop and NEC ampacity, and it supports AWG and KCMIL wire sizes.