AppCorpus
Market US

Southwire® Voltage Drop Calc

by Southwire Company

iPhone · iPad

Active Last checked 31 Jul 2026

Quick verdict

What it is
Store information collected; independent summary not yet available.
At a glance
  • Free to download

Categories and search queries

Official categories

AppCorpus categories

Key functions

Function Availability Access Scope Evidence
Free app Yes Free Store published

Screens

App Store

10 store screenshots

Southwire® Voltage Drop Calc ipad screenshot 1
Southwire® Voltage Drop Calc ipad screenshot 2
Southwire® Voltage Drop Calc ipad screenshot 3
Southwire® Voltage Drop Calc ipad screenshot 4

Pricing & paywalls

App Store

  • Free

Ratings & reviews

App Store

4.6 1471 ratings · App Store

  1. 5/5Great Quick Reference

    I use this app so often. It is a great reference tool.

    Joesee14 · 31 Jul 2026

  2. 5/5Quick and useful

    I’ve used this app for many projects over the years. Love that it has AC and DC options. Used it for regular line voltage, but also solar 400v dc, battery storage 48v dc and automotive 12v dc.

    th4t_guy · 31 Jul 2026

  3. 1/5Choice Between AWG and Metric wire Gauge

    Why does this app give a choice of Metric vs. Imperial? When I chose metric in the inputs and go to the next screen for voltage drop calculation there is no option but to use AWG and no option for metric cable size e.g. 2.5, 4, 6, 10, 16, 25, 35, 40, 50, 70, 95, 120, 150, 185, 240, 300, 400 mm2 size conductors. I am currently working British Standard regulations and really though I had something useful with this app for a min. Guess not.

    1MidwestMadMan · 31 Jul 2026

  4. 1/5Confused

    Wording is not deliberate enough and confusing when translating the end result. It should be just as simple as telling you the ampacity rating of a single wire after plugging in your distance, wire gauge, wire type, and which ambient temperature chart you will be using based on the NEC. Listing if it’s single or three phase and voltage inputs May or may not be important but if so then keep them. Don’t ask me to give you the amperage because your calculator should do that, it gets confusing if it’s asking me my overall intended amperage or the actual max amperage rating of the wire per NEC. For example- input your ambient temperature rating which most of us use the 75°C for most common applications. So if 10 awg THHN is rated at 35 amps at 75°C then I would expect the Calculator to read something like this- 75°C, 10 awg THHN (+ or x or whatever) at 200ft = 33 AMPS! So that just showed me that the ampacity rating just dropped by 2. That wasn’t a true equation of course, but I guess I was looking for something like that and then after giving the answer you could show the engineering breakdown for calculating the percentages or whatever and or maybe use tables that show you the decline of amperage at different footages? I’m not sure of the validity behind three-phase or single phase and maybe it is important but I would think a single wire by itself would have its own voltage drop after so many feet which would alter its ampcity rating?! But maybe it is important so just do the important stuff and then once you calculate that then maybe you have a Calculator to derate as these two calculations go hand and hand for sizing your wire (Circuit)

    Sandwichys · 31 Jul 2026

  5. 5/5Handy

    The app was easy to use and it comes in handy on a job site

    Passa passa · 31 Jul 2026

Privacy & accessibility

App Store

Privacy

  • Data Not Linked to You — Analytics — Diagnostics — Crash Data Developer declared
  • Data Not Linked to You — Analytics — Location — Coarse Location Developer declared
  • Data Not Linked to You — Analytics — Usage Data — Product Interaction Developer declared
  • Data Not Linked to You — Diagnostics Developer declared
  • Data Not Linked to You — Location Developer declared
  • Data Not Linked to You — Usage Data Developer declared

Accessibility

No accessibility labels collected yet.

Versions

App Store

  • 2.0.7

    Added ability to enter decimal values for amperage.

  • 2.0.8

    Replaced missing images.

  • 2.0.9

    Now allows decimal values for voltage drop percentage.

  • 2.1.0

    - Removed No of Parallel runs.

  • 2.1.1

    Bug fix.

  • 2.1.2

    Reintroducing sets, and a few other minor improvements.

  • 2.1.3

    Minor bug fix.

  • 2.1.4

    - More descriptive labels for units selection. - Default value for Max Voltage Drop set to 3%. - Better definition for Parallels. - Improved wording in Help & Feedback section.

  • 2.1.5

    - Extended results are modified to have more specific information - Pop up has been added to get attention of the user whenever there is a warning on conductor sizes

  • 2.1.6

    - Removed link to the SIMpull 600V Calculator on the More screen

  • 3.0

    New 3.0 version has the following changes from the previously released version: - Commercial & residential modes - Parallels - Straight voltage drop calculation (in addition to minimum conductor size and maximum circuit distance calculations) - Power Factor input - DC current option

  • 3.0.1

    Minor content fixes.

  • 3.0.2

    Added drop down for predefined voltage values.

  • 3.0.3

    Minor bug fixes.

  • 3.1.0

    Residential mode will no longer compute a result recommending parallels.

  • 3.1.1

    Fixes crash in More section.

  • 3.1.2

    Minor bug fixes.

  • 3.1.3

    New widget to display last calculation results.

  • 3.1.4

    Behind the scenes improvements.

  • 3.1.5

    Behind the scenes changes.

  • 3.2

    Behind the scenes changes.

  • 3.2.1

    Behind the scenes update

  • 3.2.2

    New banner.

  • 3.2.3

    New graphics.

  • 3.2.4 · 1 Jul 2026

    Behind the scenes updates.

Availability by market

Data quality & evidence

Page completeness
Live store listing
Last verified
31 Jul 2026
Sources
App Store

Report a correction