# Southwire® Voltage Drop Calc — user reviews > 52 indexed App Store user reviews of Southwire® Voltage Drop Calc by Southwire Company, rated 4.58/5 from 1,462 ratings. - Source: https://appshunter.io/ios/app/southwire-voltage-drop-calc/id440338420/reviews - App overview in markdown: https://appshunter.io/ios/app/southwire-voltage-drop-calc/id440338420.md - Rating breakdown: 5★ 1,118 · 4★ 100 · 3★ 30 · 2★ 23 · 1★ 87 ## What do users think of Southwire® Voltage Drop Calc? Overall sentiment: neutral **Pros** - 🚀 Quick and useful - 🚀 Great Quick Reference - 👍 A must have app for electricians - 👍 Love These - 👍 Electrical Engineer - 👍 Awesome app - 👍 Safer - 👍 Useful - 👍 Handy - 👍 Great App - 👍 Dependable app - 👍 Electrician tech - 👍 Solid and simple to use app - 👍 Great app **Cons** - 🐛 Motor starting Voltage drop - 🐛 Useless! - 🐛 Won't work - 🐛 How to use - 🐛 Confused - 🐛 Bad app - 🐛 Bad - 🐛 Not applicable for Residential - 🐛 Electrician - 🐛 Terrible - 🐛 Not working - 🐛 What?? - 🐛 Terrible - 🐛 Don't work - 🐛 Terrible - 🐛 Choice Between AWG and Metric wire Gauge - 🐛 Updated app not so simple - 🐛 The last version was better - 🐛 App - 🐛 Terrible - 🐛 Voltage drop calculator - 🐛 IOS 8 - 🐛 One flaw - 🐛 Worst app ever - 🐛 Average **Commonly reported bugs** - Useless! - Won't work - How to use - Confused - Bad app - Bad - Not applicable for Residential - Electrician - Terrible - Not working - What?? - Terrible - Don't work - Terrible - Choice Between AWG and Metric wire Gauge - Updated app not so simple - The last version was better - App - Terrible - Voltage drop calculator - IOS 8 - One flaw - Worst app ever - Average **Most requested features** - Motor starting Voltage drop calculation - Metric wire size options ## Newest reviews (10 of 52) ### 3/5 — Motor starting Voltage drop *2025-01-17, version 3.2.2* Motors have minimum starting voltage drop to 90% of the motors nameplate voltage. The program does not allow inputting a starting current to calculate the starting Voltage drop. ### 3/5 — Quick and Easy! *2023-05-12, version 3.1.3* This is a great field use tool to figure out wire size on the fly! ### 4/5 — Simple *2019-03-18, version 2.1.6* calculator works as expected. ### 2/5 — Calculator works but not for low voltage *2019-03-14, version 2.1.6* The smallest AWG in this calculator is 14AWG so it is pretty much useless for low voltage circuits. It is evident this is for 120v and above but the app doesn’t state that. ### 2/5 — Electrician *2019-03-02, version 2.1.6* Installed app and did not work screen frozen ### 1/5 — What?? *2019-01-25, version 2.1.6* I tried to calculate voltage drop on a 211m run 120v 15a circuit and it told me my minimum size conductor was 1 AWG I would be fired if I trusted this app... ### 1/5 — Terrible *2018-12-20, version 2.1.6* Can not figure out to use ### 5/5 — Dependable app *2018-11-14, version 2.1.5* Accurate, Trustworthy & Convenient ### 5/5 — Electrician tech *2018-10-17, version 2.1.5* Thanks guy for making life easier good looking ### 2/5 — Don’t work *2018-06-25, version 2.1.5* I didn’t see a way to see results after entering info? ## Most critical reviews (10 lowest-rated) ### 1/5 — Useless! *2020-09-08, version 3.1.0* Stalls at picking residential or commercial. ### 1/5 — Grayfurnaceman *2020-02-17, version 2.1.6* The app simply does not work. The screen is mostly locked. The only part that works is the review. GFM ### 1/5 — Won't work *2019-12-19, version 2.1.6* Can't get app to work. ### 1/5 — How to use *2019-11-05, version 2.1.6* Typed information in, no Calculation button ### 1/5 — Confused *2019-10-12, version 2.1.6* 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) ### 1/5 — Bad app *2019-09-26, version 2.1.6* So bad hard to use don’t give you a lot of options Some times it just don’t work well like 50% of the time ### 1/5 — Bad *2019-03-15, version 2.1.6* Doesn’t work correct. does not calculate for being a CALCULATOR. they need to address or fix so not download ### 1/5 — Not applicable for Residential *2019-03-06, version 2.1.6* Single phase, 240 volt, Aluminum, 100 amp, 200 feet run is not #2/0... ### 1/5 — Terrible *2019-02-13, version 2.1.6* Upgrade ruined this app deleted it was good you ruined it too difficult ### 1/5 — Not working *2019-02-12, version 2.1.6* Not working ## Most praised reviews (10 highest-rated) ### 5/5 — Quick and useful *2025-07-09, version 3.2.2* 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. ### 5/5 — Great Quick Reference *2025-02-18, version 3.2.2* I use this app so often. It is a great reference tool. ### 5/5 — A must have app for electricians *2022-02-11, version 3.1.3* I use this app for my job as an industrial electrician. It works great! It is a time saver. ### 5/5 — Love These *2022-01-11, version 3.1.3* It’s good. Thanks to Southwire for allowing me such generous computing capabilities on my iPhone. Five stars earned. ### 5/5 — Electrical Engineer *2021-12-28, version 3.1.3* I use every day in the field. ### 5/5 — Awesome app *2021-12-06, version 3.1.3* Awesome app ### 5/5 — Safer *2021-10-02, version 3.1.3* Nice to have this Much safer then trying to remember or look up to fine the correct information and it’s right on my phone Thank you for offering this By the way your wire is all that I will use ### 5/5 — Useful *2021-09-21, version 3.1.3* Nice to be able to sit on the site and run the various options to figure out what size cable to run ### 5/5 — Handy *2021-03-31, version 3.1.3* The app was easy to use and it comes in handy on a job site ### 5/5 — Great App *2019-12-30, version 2.1.6* Easy to use --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-01.*