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Mike Holt's Electrical Toolbox

Mike Holt's Electrical Toolbox

Electrical Power Calculator

197 ratings
30 reviews
📚 Education
🔧 Utilities
Free

Details

Released
May 23, 2019
Updated
July 9, 2026

Features

Developer

Mike Holt Enterprises
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About

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
Show original description

What users say about Mike Holt's Electrical Toolbox

Reviews of Mike Holt's Electrical Toolbox are mixed: the Utilities app is rated 4.6/5 from 197 App Store ratings. What users like most: great app for electricians, provides code article references. Top complaints: emailing results not working, outdated information. Summarized from real user reviews.

Positive things

  • 👍Great app for electricians
  • 💡Provides code article references
  • 👍Useful for on-the-spot reference
  • 👍Excellent for verifying calculations
  • 👍Helpful for exam preparation
  • 👍Simplifies the trade
  • 👍Great jobsite resource
  • 👍Handy tool for electricians
  • 👍Teaches code in an advanced way
  • 👍Free app with needed features
  • 👍Helps size A/C circuits correctly
  • 👍American made

Negative things

  • 🐛Emailing results not working
  • 🐛Outdated information
  • 🐛Load calc a little clunky
  • 🐛Content setup needs overhaul
  • 🐛Video series lacks completion system
  • 🐛Bug with widescreen video exit
  • 🐛Not user-friendly
  • 🐛Outdated app needs refinement
  • 🐛Previous calculation data not erased
  • 🐛App is straight garbage (paid)
See all reviews

What's New in Mike Holt's Electrical Toolbox

2.0.03

July 9, 2026

Bug fixes and performance improvements.

User reviews

Most RecentHighest RatedLowest Rated

You can’t email the information you have to forward

It’s a good app, but it has the option to email the results, but it won’t let you. It’s frustrating.
UUsernon

Need more

Take transformers at least to 225kva. 112 isn’t enough for this to be useful.
SSpark1239

Great app

Perfect app. I really like how it gives the code article with the results.
Bbouf328

Great in the tool box

Outstanding app to verify calculations. The best parts is it gives reference to code sections so you ca read for your self.
IAIt totally awefull

Outdated

Info in this app is outdated and for the most part useless to any decent electrician
Ccbenn81
See 25 more reviews

User experience

🐞

Reported Bugs

4 issues

Cannot email results

Bug

Video player widescreen exit bug

Bug

Previous calculation data not erased

Bug

App content is outdated

Bug
✨

Requested Features

6 requests

Increase transformer capacity to 225kva

Feature

Add option to print load calc

Feature

Update to NEC 2020

Feature

Add completion system for video series

Feature

Refine user interface for better usability

Feature

Add more features, willing to pay extra

Feature

FAQ

What kind of calculations does this app perform?

This app performs a variety of essential electrical calculations. These include conductor sizing, accounting for voltage drop limitations, circuit protection sizing, race sizing, and equipment grounding conductor sizing for various types of equipment like heating, air-conditioning, motors, and transformers. It also handles dwelling-unit service calculations.

Who is this app designed for?

The app is specifically designed for professionals in the electrical industry. This includes electricians, inspectors, instructors, contractors, and engineers who need practical and useful tools for their daily work.

Is this app free to use?

Yes, based on the provided information, this app is available for free. There are no indications of in-app purchases or advertisements, suggesting a completely free user experience.

What types of electrical equipment can be calculated?

The app supports calculations for a wide range of electrical equipment. This includes electric heating equipment (commercial and residential), air-conditioning equipment (commercial and residential), motors (commercial and residential), and transformers (commercial). It also covers dwelling-unit service calculations.