Fault Current Calculator vs Box Fill Calc
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Fault Current Calculator
This tool helps contractors, engineers, and electricians quickly calculate available fault current on single and three-phase electrical systems. It also assists in sizing fuses and conductors for various circuits and can generate labels for service equipment.
- Calculate available fault current
- Size fuses and conductors
- Generate service equipment labels
- Single and three-phase system support
- NEC® 110.24 compliance
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Eaton's Bussmann Series FC2 Available Fault Current Calculator application is an innovative tool developed for contractors, engineers, electricians, and electrical inspectors. This tool can be used on the Bussmann website or out in the field on a mobile device for those needing a quick and simple way to determine available fault current. With this simple tool, users can: - Calculate available fault current on single and three-phase systems - Create and send a label via email for marking the available fault current on service equipment (NEC® 110.24) - Size fuses and conductors for service, feeder, and branch circuits. This application, calculations, and other information are intended to clearly present technical information that will determine the available fault current at specific points in an electrical system. Bussmann reserves the right, without notice, to change this application and/or discontinue/ limit its distribution and/or availability. Bussmann also reserves the right to change or update, without notice, any technical information contained in this application. The data and information presented in this application are believed to be accurate. However, any and all liability for the content, or any omissions from this application, including any inaccuracies, errors, or misstatements in such data, calculations or information, is expressly disclaimed. The application, calculations and other information are provided without warranty of any kind, either expressed or implied, but not limited to, the implied warranties of merchantability, or fitness for a particular purpose. Bussmann disclaims any liability for the use of this application, calculations or other information. The complete End-User License Agreement can be found at: https://faultcurrentcalculatorpro.bussmann.com/home/eula
Box Fill Calc
This app simplifies electrical box fill calculations for any job size. It allows users to create and save unlimited calculations, solve for various box sizes, and export results to spreadsheets or print directly. It supports current electrical code standards and includes a built-in construction calculator.
- Unlimited saved calculations
- Solve for custom and compound boxes
- Export results to spreadsheet
- Direct printing via AirPrint
- Supports 2014 NEC and 2012
- Built-in construction calculator
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Box Calc is a fast, easy way to create a schedule of box fill calculations for any size of job or just to perform a single calculation on the fly. Put your pencil down and start making professional, consistent calculations today. - Universal app allows use on both iPad, and iPhone/iPod with single purchase. - Create an unlimited list of calculations that automatically save. - Solve for any size box including custom and compound. - Export your results to a spreadsheet for formatting or printing. - Print directly from the app (requires AirPrint printer). - Support for 2014 NEC and 2012. Built in construction calculator allows intermediate calculations to be performed within the app.
Screenshots
Verdict
The clearest difference is review sentiment: Box Fill Calc at 60% against Fault Current Calculator's 0%. Box Fill Calc also leads on in-app purchases (none vs 2) and rating (3.2 vs 3.0). Fault Current Calculator's advantage is price (Free vs $4.99) and ratings volume (27 vs 5). On update cadence, ads 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
Fault Current Calculator is free to download; Box Fill Calc costs $4.99 up front. Fault Current Calculator sells 2 in-app purchases, starting at $4.99 per month. Box Fill Calc asks for nothing beyond the download.
Box Fill Calc holds the better App Store score, 3.2 against 3.0. That said, the two scores are not equally well evidenced: Fault Current Calculator has 27 ratings behind it against 5, so its average is the more settled of the two. Written reviews point the same way: 0% of Fault Current Calculator's written reviews are positive against 60% of Box Fill Calc's.
Fault Current Calculator ships an update every 4 months, Box Fill Calc every 3 months. The most recent releases landed on October 23, 2026 and October 24, 2026 respectively.
| Parameter | Fault Current Calculator | Box Fill Calc |
|---|---|---|
| Price | Free — better | $4.99 |
| Rating | 3.0 (27 ratings) | 3.2 (5 ratings) — better |
| Positive reviews | 0.0% of reviews | 60.0% of reviews — better |
| Number of ratings | 27 — better | 5 |
| Update frequency | Every 4 months | Every 3 months — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Freemium — better | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 14.0 | 8.0 — better |
| Further details — not scored | ||
| Size | 25 MB | 18 MB |
| Age rating | 17+ | 4+ |
| Developer | Cooper Bussmann, LLC | Snappy Appz Inc. |
Customer experience
Fault Current Calculator
Box Fill Calc
In-app purchases
Fault Current Calculator
- Pro Monthly Subscription7 Days trial$4.991 Month
- Pro Annual Subscription7 Days trial$39.991 Year
Box Fill Calc
No in-app purchases
Questions
Is Fault Current Calculator free?
Is Box Fill Calc free?
Which has better reviews, Fault Current Calculator or Box Fill Calc?
Do Fault Current Calculator or Box Fill Calc have ads?
Which is updated more often, Fault Current Calculator or Box Fill Calc?
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