Southwire® Voltage Drop Calc 4+

Southwire Calculator

Southwire Company

Designed for iPad

    • 4.6 • 1.2K Ratings
    • Free



Southwire's voltage drop calculator will help you determine the proper wire size for an electrical circuit based on the voltage drop and current carrying capacity of an electrical circuit. Determines wire size to meet specific voltage drop limits or calculates voltage drop for a specific conductor run. When sizing conductors, calculations limits wire size to voltage drop and NEC ampacity. Southwire's Voltage Drop Calculator is designed for applications using AWG and KCMIL sizes only.

What’s New

Version 3.1.5

Behind the scenes changes.

Ratings and Reviews

4.6 out of 5
1.2K Ratings

1.2K Ratings

JiimyS ,


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

Reelli ,


Nice to be able to sit on the site and run the various options to figure out what size cable to run

Ghhhhfssd ,

A must have app for electricians

I use this app for my job as an industrial electrician. It works great! It is a time saver.

App Privacy

The developer, Southwire Company, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Linked to You

The following data may be collected but it is not linked to your identity:

  • Location
  • Usage Data
  • Diagnostics

Privacy practices may vary, for example, based on the features you use or your age. Learn More

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