# Southwire® Voltage Drop Calc

> Southwire Calculator

Canonical page: [https://chrome-stats.com/d/id440338420](https://chrome-stats.com/d/id440338420)

## Overview

- **ID:** `id440338420`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** Southwire Company
- **Category:** Utilities
- **Rating:** 4.60 / 5 (1,480 ratings)
- **Version:** 3.2.4
- **Last updated:** 2026-07-01
- **First published:** 2011-06-02
- **Size:** 10 MB
- **Data as of:** 2026-09-06
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/southwire-voltage-drop-calc/id440338420)
- **Website:** [http://www.southwire.com/apps](http://www.southwire.com/apps)
- **Privacy policy:** [http://www.southwire.com/support/privacy-policy-mobile-and-apps.htm](http://www.southwire.com/support/privacy-policy-mobile-and-apps.htm)

## Description

Southwire's Voltage Drop Calc helps electricians and engineers size conductors for electrical circuits by evaluating voltage drop against specified limits and NEC ampacity. It is designed for AWG and KCMIL sizes.

It can size conductors to meet a target voltage drop or calculate voltage drop for a specific conductor run, with NEC ampacity limits applied.

## Rankings

- #46,406 — Overall

## Review summary

Users praise the app as a handy on-site wire-sizing tool with AC/DC options and easy field reference, saving time. However, reliability is a major concern, with many reports of crashes or the app not working after updates. Calculation/output gaps, unclear ampacity details, and limited metric support are common complaints. Usability issues also appear. Overall, it's valuable when functioning but unreliable and sometimes confusing to use.

### Pros

- On-site field sizing tool that lets electricians quickly determine wire sizes in the field.
- Supports both AC and DC options (including solar, battery storage, and automotive voltages).
- Easy to use and serves as a quick reference, saving time on the job.
- Portable, professional-grade tool that many users rely on daily.
- Provides a safe, reliable reference on a mobile device with ready access to data.

### Cons

- App frequently becomes unusable due to crashes, frozen screens, or being non-responsive after updates.
- Calculation/output issues, such as missing results, unclear ampacity outputs, or inability to input starting current for motor starts.
- Usability and wording problems, including confusion about inputs and limited options or features.
- Poor or incomplete metric support (metric vs imperial) and lack of metric cable sizes.
- Some reviews report inconsistent performance (e.g., 'does not work' or 'not functioning' for certain versions).

## Similar extensions and apps

- [Voltage Drop Calculator.](https://chrome-stats.com/d/id1203737064) — 4.60 / 5
- [Building Wire Selector](https://chrome-stats.com/d/id6670218338) — 5.00 / 5
- [WCW Voltage Drop Calculator](https://chrome-stats.com/d/id6755205497) — 3.50 / 5
- [Voltage Drop & Wire Size](https://chrome-stats.com/d/id6762137454) — 5.00 / 5
- [Voltage Drop Calculators](https://chrome-stats.com/d/id6464050324) — 3.70 / 5
- [Wire Gauge & Size Calculator](https://chrome-stats.com/d/id6743387075) — 4.90 / 5
- [AWG Calculator: Wire Size](https://chrome-stats.com/d/id1607173204) — 4.70 / 5
- [WireSizer - DC Voltage Drop](https://chrome-stats.com/d/id494748550) — 4.50 / 5
- [Southwire® Conversion Calc](https://chrome-stats.com/d/id545756420) — 4.20 / 5
- [WireSize: Voltage Drop, AWG](https://chrome-stats.com/d/id6772919484)
- [Wire Gauge Calculator](https://chrome-stats.com/d/id788713397) — 1.00 / 5
- [Cable Size Calculators](https://chrome-stats.com/d/id6471071271)

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Source: [Chrome-Stats](https://chrome-stats.com/d/id440338420)