Mike Holt's Electrical Toolbox vs Power Conversion Calc
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
Power Conversion Calc
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The Power Conversion app is for AC & DC Electrical Systems in Transportation (EV, Rail, Airports), Renewable Power (Solar, Wind, BESS), Utility and Commercial Buildings.
Screenshots
Verdict
The clearest difference is iOS requirement: Mike Holt's Electrical Toolbox at 14.0 against Power Conversion Calc's 16.0. 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.
Both ship on a similar rhythm, roughly every 3 months. The most recent releases landed on September 21, 2026 and September 12, 2026 respectively.
| Parameter | Mike Holt's Electrical Toolbox | Power Conversion Calc |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (197 ratings) — better | — |
| Positive reviews | 76.7% of reviews | — |
| Number of ratings | 197 — better | — |
| Update frequency | Every 3 months | Every 3 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 14.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 26 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | Mike Holt Enterprises | Southwire Company |
Bugs and 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
Power Conversion Calc
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Mike Holt's Electrical Toolbox
No in-app purchases
Power Conversion Calc
No in-app purchases
Questions
Is Mike Holt's Electrical Toolbox free?
Is Power Conversion Calc free?
Do Mike Holt's Electrical Toolbox or Power Conversion Calc have ads?
Which is updated more often, Mike Holt's Electrical Toolbox or Power Conversion Calc?
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