Comparison

Mike Holt's Electrical Toolbox vs Conduit Fill

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head

Mike Holt's Electrical Toolbox

Electrical Power Calculator

Free

🔧 Utilities

★ 4.6198 ratingsView app →

Conduit Fill

quickly calculate conduit fill

$4.99

🔧 Utilities

★ 3.33 ratingsView app →

About

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.

Highlights

Conductor sizing
Voltage drop limitations
Circuit protection sizing
Race sizing
Equipment grounding conductor sizing
Dwelling-unit service calculations

Features

Read full description

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.

About

Conduit Fill

This app helps electricians quickly calculate conduit fill based on the latest NEC or CEC codes. Easily add various wire types and quantities to determine the minimum required conduit size.

Highlights

NEC and CEC code calculations
Support for up to 1000 wires
Select from different wire types
Instant calculation for all conduit sizes
Minimized display for most common sizes

Features

Read full description

Quickly calculate a conduit fill according to the latest NEC or CEC. Simply add your wires and get all minimum conduit sizes. A streamlined app to help calculate conduit fill. The following features are included: - USA (NEC) or Canada (CEC) latest code calculations - add up to 1000 wires and select from all different types - instant calculation for all conduit sizes (most used 3 are minimized)

Screenshots

Mike Holt's Electrical Toolbox4 screens

Conduit Fill4 screens

Verdict

The call

The clearest difference is price: Mike Holt's Electrical Toolbox at Free against Conduit Fill's $4.99. Mike Holt's Electrical Toolbox also leads on rating (4.6 vs 3.3) and ratings volume (198 vs 3). Conduit Fill's advantage is iOS requirement (12.0 vs 14.0). On update cadence, ads, in-app purchases and device support 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

CostPrice · In-app purchases · Ads · Monetization

Mike Holt's Electrical Toolbox is free to download; Conduit Fill costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Mike Holt's Electrical Toolbox holds the better App Store score, 4.6 against 3.3. That said, the two scores are not equally well evidenced: Mike Holt's Electrical Toolbox has 198 ratings behind it against 3, so its average is the more settled of the two.

UpkeepUpdate frequency

Mike Holt's Electrical Toolbox ships an update every 3 months, Conduit Fill every 5 months. The most recent releases landed on November 6, 2026 and November 3, 2026 respectively.

Scorecard5 real differences · 5 level

Mike Holt's Electrical Toolbox versus Conduit Fill: the parameters behind the verdict, then further details
Parameter	Mike Holt's Electrical Toolbox	Conduit Fill
Price	Free — better	$4.99
Rating	4.6 (198 ratings) — better	3.3 (3 ratings)
Positive reviews	76.7% of reviews	—
Number of ratings	198 — better	3
Update frequency	Every 3 months — better	Every 5 months
Ads	No	No
In-app purchases	No	No
Monetization	Free — better	Paid
Devices	iPhone, iPad, iPod	iPhone, iPad, iPod, Mac — better
Requires iOS	14.0	12.0 — better
Further details — not scored
Size	26 MB	23 MB
Age rating	4+	4+
Developer	Mike Holt Enterprises	Martin Loch

Customer experience

Mike Holt's Electrical Toolbox

All ratings197 ratings

Positive90.4%

Neutral1.5%

Negative8.1%

Written reviews30 reviews

Positive76.7%

Neutral6.7%

Negative16.7%

Conduit Fill

All ratings3 ratings

Positive66.7%

Neutral0.0%

Negative33.3%

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

Show 1 more

Add more features, willing to pay extra

Conduit Fill

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Mike Holt's Electrical Toolbox

No in-app purchases

None

Conduit Fill

No in-app purchases

Questions

Is Mike Holt's Electrical Toolbox free?

Mike Holt's Electrical Toolbox is free to download, with no in-app purchases.

Is Conduit Fill free?

Conduit Fill costs $4.99, with no in-app purchases.

Which has better reviews, Mike Holt's Electrical Toolbox or Conduit Fill?

Mike Holt's Electrical Toolbox is rated higher. Mike Holt's Electrical Toolbox averages 4.6 out of 5 from 198 ratings, while Conduit Fill averages 3.3 from 3 ratings.

Do Mike Holt's Electrical Toolbox or Conduit Fill have ads?

Neither Mike Holt's Electrical Toolbox nor Conduit Fill shows ads.

Which is updated more often, Mike Holt's Electrical Toolbox or Conduit Fill?

Mike Holt's Electrical Toolbox ships an update every 3 months, and Conduit Fill every 5 months. Most recently, Mike Holt's Electrical Toolbox was updated on November 6, 2026 and Conduit Fill on November 3, 2026.