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Southwire® Voltage Drop Calc

Southwire® Voltage Drop Calc

Southwire Calculator

1.5K ratings
53 reviews
🔧 Utilities
📊 Productivity
Free

Details

Released
June 2, 2011
Updated
July 1, 2026

Features

Developer

Southwire Company
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About

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 drop
✓Calculate voltage drop for conductor runs
✓Limit wire size by voltage drop
✓Limit wire size by NEC ampacity
✓Supports AWG and KCMIL sizes
Show original description

What users say about Southwire® Voltage Drop Calc

Reviews of Southwire® Voltage Drop Calc are mixed: the Utilities app is rated 4.6/5 from 1.5K App Store ratings. What users like most: quick and useful, great Quick Reference. Top complaints: motor starting Voltage drop, useless. Summarized from real user reviews.

Positive things

  • 🚀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

Negative things

  • 🐛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
See all reviews

What's New in Southwire® Voltage Drop Calc

3.2.4

July 1, 2026

Behind the scenes updates.

User reviews

Most RecentHighest RatedLowest Rated

Helpful app

3 phase system should be included y calculations
Rrogervalladares

Quick 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.
Tth4t_guy

Great Quick Reference

I use this app so often. It is a great reference tool.
JJoesee14

Motor starting Voltage drop

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.
JJGlennPE

Quick and Easy!

This is a great field use tool to figure out wire size on the fly!
PProverbs14_27
See 48 more reviews

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User experience

🐞

Reported Bugs

24 issues

Useless!

Bug

Won't work

Bug

How to use

Bug

Confused

Bug

Bad app

Bug

Bad

Bug

Not applicable for Residential

Bug

Electrician

Bug

Terrible

Bug

Not working

Bug

What??

Bug

Terrible

Bug

Don't work

Bug

Terrible

Bug

Choice Between AWG and Metric wire Gauge

Bug

Updated app not so simple

Bug

The last version was better

Bug

App

Bug

Terrible

Bug

Voltage drop calculator

Bug

IOS 8

Bug

One flaw

Bug

Worst app ever

Bug

Average

Bug
✨

Requested Features

2 requests

Motor starting Voltage drop calculation

Feature

Metric wire size options

Feature

FAQ

What does the Southwire Voltage Drop Calc app do?

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.

What are the key features of this voltage drop calculator?

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.

Is this app free to use?

Yes, the Southwire Voltage Drop Calc app is available for free. There are no in-app purchases or advertisements mentioned, indicating it is a completely free utility.

What types of wire sizes does this app support?

The calculator is designed specifically for applications using American Wire Gauge (AWG) and Kilocircle Mil (KCMIL) sizes. It does not support other wire sizing standards.

Who would benefit from using this app?

This app is beneficial for electricians, electrical engineers, and anyone involved in designing or installing electrical circuits. It helps ensure circuits are correctly sized for safety and efficiency according to industry standards.