Southwire® Conversion Calc vs Mike Holt's Electrical Toolbox
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Southwire® Conversion Calc
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.
- Copper to aluminum conversion
- Aluminum to copper conversion
- Pricing unit of measure calculation
- Conversion factor calculation
- Weight per product length calculation
- Preloaded cable data
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Southwire's Conversion Calculator helps to convert copper to aluminum or aluminum to copper, pricing unit of measure, conversion factor and weight per product length. Preloaded with many cables for calculation.
Mike Holt's Electrical Toolbox
This app provides essential calculations for electricians, inspectors, contractors, and engineers. It helps determine conductor sizing, circuit protection, race sizing, and grounding conductor sizes for various electrical equipment and services.
- Conductor sizing
- Voltage drop limitations
- Circuit protection sizing
- Race sizing
- Equipment grounding conductor sizing
- Dwelling-unit service calculations
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Mike Holt, the industry leader in the electrical industry (MikeHolt.com) has created an amazing, practical and useful app for the electrician, inspector, instructor, contractor and engineer. The app contains conductor sizing (including voltage drop limitations), circuit protection sizing, race sizing, equipment grounding conductor sizing for electric heating equipment (commercial and Residential), air-conditioning equipment (commercial and Residential), motors (commercial and Residential), Transformers (commercial) , and dwelling-unit service calculations and sizing.
Screenshots
Verdict
The clearest difference is review sentiment: Mike Holt's Electrical Toolbox at 77% against Southwire® Conversion Calc's 0%. Mike Holt's Electrical Toolbox also leads on rating (4.6 vs 4.2) and ratings volume (197 vs 5). On price, update cadence, ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Mike Holt's Electrical Toolbox holds the better App Store score, 4.6 against 4.2. That said, the two scores are not equally well evidenced: Mike Holt's Electrical Toolbox has 197 ratings behind it against 5, so its average is the more settled of the two. Written reviews point the same way: 0% of Southwire® Conversion Calc's written reviews are positive against 77% of Mike Holt's Electrical Toolbox's.
Southwire® Conversion Calc ships an update every 4 months, Mike Holt's Electrical Toolbox every 3 months. The most recent releases landed on August 28, 2026 and September 21, 2026 respectively.
| Parameter | Southwire® Conversion Calc | Mike Holt's Electrical Toolbox |
|---|---|---|
| Price | Free | Free |
| Rating | 4.2 (5 ratings) | 4.6 (197 ratings) — better |
| Positive reviews | 0.0% of reviews | 76.7% of reviews — better |
| Number of ratings | 5 | 197 — better |
| Update frequency | Every 4 months | Every 3 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone | iPhone, iPad, iPod — better |
| Requires iOS | 16.6 | 14.0 — better |
| Further details — not scored | ||
| Size | 7 MB | 26 MB |
| Age rating | 4+ | 4+ |
| Developer | Southwire Company | Mike Holt Enterprises |
Customer experience
Southwire® Conversion Calc
Mike Holt's Electrical Toolbox
Bugs and requests
Southwire® Conversion Calc
Not enough reviews yet to summarise bugs or requests.
Mike Holt's Electrical Toolbox
Reported bugs
4 issues- Cannot email results
- Video player widescreen exit bug
- Previous calculation data not erased
- App content is outdated
Requested features
6 requests- Increase transformer capacity to 225kva
- Add option to print load calc
- Update to NEC 2020
- Add completion system for video series
- Refine user interface for better usability
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- Add more features, willing to pay extra
In-app purchases
Southwire® Conversion Calc
No in-app purchases
Mike Holt's Electrical Toolbox
No in-app purchases
Questions
Is Southwire® Conversion Calc free?
Is Mike Holt's Electrical Toolbox free?
Which has better reviews, Southwire® Conversion Calc or Mike Holt's Electrical Toolbox?
Do Southwire® Conversion Calc or Mike Holt's Electrical Toolbox have ads?
Which is updated more often, Southwire® Conversion Calc or Mike Holt's Electrical Toolbox?
Other comparisons
