# Southwire® Conversion Calc vs Box Fill 2

The clearest difference is price: Southwire® Conversion Calc at Free against Box Fill 2's $3.99. Southwire® Conversion Calc also leads on rating (4.2 vs 3.3) and iOS requirement (16.6 vs 26.0). Box Fill 2's advantage is review sentiment (33% vs 0%) and update cadence (every 5 weeks vs every 4 months). On ratings volume, ads, in-app purchases and device support there is nothing between them.

Southwire® Conversion Calc is free to download; Box Fill 2 costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Southwire® Conversion Calc holds the better App Store score, 4.2 against 3.3. Both are backed by a comparable volume of ratings — 5 and 3 respectively. Written reviews complicate that: 0% of Southwire® Conversion Calc's written reviews are positive against 33% of Box Fill 2's, so the app with the better star average is not the one people write more warmly about.

Southwire® Conversion Calc ships an update every 4 months, Box Fill 2 every 5 weeks. The most recent releases landed on August 28, 2026 and August 27, 2026 respectively.

## The numbers

| Metric | Southwire® Conversion Calc | Box Fill 2 |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | **[4.2 (5 ratings)](https://appshunter.io/ios/app/southwire-conversion-calc/id545756420/reviews)** | [3.3 (3 ratings)](https://appshunter.io/ios/app/box-fill-2/id1589765411/reviews) |
| Number of ratings | **5** | 3 |
| Positive reviews | 0.0% of reviews | **33.3% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 5 weeks** |
| Monetization | **Free** | Paid |
| Size | 7 MB | 19 MB |
| Requires iOS | **16.6** | 26.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Southwire Company](https://appshunter.io/developer/440338423) | [Snappy Appz Inc.](https://appshunter.io/developer/375591377) |

## What reviewers say

### Southwire® Conversion Calc

[App page](https://appshunter.io/ios/app/southwire-conversion-calc/id545756420)

This utility app facilitates conversions between copper and aluminum electrical wiring. It allows users to calculate pricing, unit of measure, conversion factors, and weight based on product length. The app comes preloaded with numerous cable types for easy calculation.

**Highlights:** Copper to aluminum conversion, Aluminum to copper conversion, Pricing unit of measure calculation, Conversion factor calculation, Weight per product length calculation, Preloaded cable data

**Features:** macOS Compatibility

**In-app purchases:** none


### Box Fill 2

[App page](https://appshunter.io/ios/app/box-fill-2/id1589765411)

This utility app helps electricians and contractors perform precise electrical box fill calculations according to the latest codes. It also includes a comprehensive construction calculator for dimensional math, area, volume, and right-angle solutions.

**Highlights:** Electrical box fill calculations, Construction calculator, Dimensional math (feet-inches-fractions, metric), Area and volume calculations, Right-angle solutions, Shareable calculation reports, iCloud sync across devices

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Southwire® Conversion Calc free?

Southwire® Conversion Calc is free to download, with no in-app purchases.

### Is Box Fill 2 free?

Box Fill 2 costs $3.99, with no in-app purchases.

### Which has better reviews, Southwire® Conversion Calc or Box Fill 2?

Southwire® Conversion Calc is rated higher. Southwire® Conversion Calc averages 4.2 out of 5 from 5 ratings, while Box Fill 2 averages 3.3 from 3 ratings.

### Do Southwire® Conversion Calc or Box Fill 2 have ads?

Neither Southwire® Conversion Calc nor Box Fill 2 shows ads.

### Which is updated more often, Southwire® Conversion Calc or Box Fill 2?

Southwire® Conversion Calc ships an update every 4 months, and Box Fill 2 every 5 weeks. Most recently, Southwire® Conversion Calc was updated on August 28, 2026 and Box Fill 2 on August 27, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*