Workman's Calculator Pro vs Kopperfield
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Workman's Calculator Pro
This construction calculator simplifies complex measurements for tradespeople. It allows simultaneous calculations in feet, inches, yards, and meters, with an intuitive interface for fractions and decimals. Get accurate results quickly to save time on the job.
- Simultaneous multi-unit calculations (feet, inches, yards, meters)
- Intuitive fraction input with dynamic button display
- Handles decimal multiplication
- Multiple display options (feet, inches, decimals)
- Designed for speed and accuracy in construction
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The calculator has been rebuilt, and it's built for the trades! Workman's Construction Calculator is the best, and simplest construction calculator available on the App Market. With the most intuitive way to calculate measurements. Work with Feet, inches, yards, meters, and regular numbers. Simultaneously! Never before has a calculator worked like this! Do you want to put in 3/16 of an inch? Press the numerator button, click 3, and click 16 afterward, done. Yes, 16. One of the unique parts of Workman's Calculator is that the buttons change. When selecting a numerator only odd values are shown (1, 3, 5, 7, 9). After clicking one of the values the appropriate denominator values appear. If the numerator is 9 or higher, automatically 16 is selected. The denominators will always be more than the numerator. Need to multiply by a decimal? Go ahead. Choose how you wish to view your calculations. • Feet • Inches • Decimals Workman's Calculator is about being quick and getting you your calculations that you need, so there's more time getting done what needs to be done and less time on the phone.
Kopperfield
Streamline electrical design and permitting with powerful tools for load calculations, panel schedules, and single-line diagrams. Quickly reference the National Electrical Code with an AI-powered chatbot and generate instant PDF reports for inspectors and clients.
- Load calculator with NEC standards
- Single line diagram tool
- Panel schedule creation
- NEC chatbot
- Instant PDF report generation
- AI panel photo processing
- Team dashboard
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Save time and money. Get ready for permits and projects with faster and easier design tools from Kopperfield, including load calcs, line diagrams, panel schedules, and more. Once logged into your Kopperfield account, you'll enjoy our: * Load calculator: Easy-to-use interface pre-loaded with common appliances and their standard output values from the National Electrical Code. Add information on the property and your calculation will automatically update. Supports both commercial and residential calculations, as well as the Standard (NEC Article 220 Part III), Optional (NEC Article 220 Part IV), and 2026 Standard (NEC Article 120 Part III) methods. * Single line diagram tool: Contains dozens of common templates and electrical symbols to make it easy to generate new diagrams and share them with your team. View diagrams from any device and create new templates on tablet or desktop for your whole team to use. * Panel schedules: Includes tools to complete panel schedules and create labels for electrical panels. Drag-and-drop interface makes it easy to arrange and customize circuits for both split-phase and three-phase projects. * NEC chatbot: Custom chatbot with advanced search capabilities to quickly reference specific sections of the 2017, 2020, or 2023 National Electrical Code. Includes the following features: * Fast PDF outputs: instantly generate a downloadable, one-page PDF report of your load calc, line diagram, or panel schedule to share with inspectors and customers * Smart property data: enter the property address and we’ll pull in the square footage for any customer project or electrical load calculation * AI panel photo processing: upload a photo of an electrical panel to automatically add items to your load calculation or panel schedule * Team dashboard: store your team's projects and documents in one place for easier management, access, and review *Single and three phase options: use a variety of nominal voltages for residential and commercial building types, including: 120/240V, 120/208V, 120/240V, 208Y/120V 3Ø, 240V 3Ø Delta, 240V 3Ø Hi-leg Delta, 347V 3Ø Delta, 480Y/277V 3Ø, 480V 3Ø Delta, 600Y/347Y 3Ø, 600V 3Ø Delta. * Standard scenarios: generate load calcs for scenarios including single family homes (standard and optional methods), multi dwelling units (i.e., duplex, triplex, quad), 120/208v (three-phase power) dwellings, accessory dwelling units and additions, commercial occupancy types, and heat pumps * Common appliance defaults: choose from a pre-loaded list of common appliances and standard output values that you can adjust for every load calculation * EV charger inputs: include EV charger values to any load calculation, essential for modern homes
Screenshots
Verdict
Workman's Calculator Pro and Kopperfield both sit at 4.1 stars, but that hides the real split: 67% of Workman's Calculator Pro's written reviews are positive against 0% of Kopperfield's. Workman's Calculator Pro also leads on chart position (#98 vs unranked) and ratings volume (51 vs 9). Kopperfield's advantage is price (Free vs $1.99). On rating, 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
Kopperfield is free to download; Workman's Calculator Pro costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Workman's Calculator Pro holds the better App Store score, 4.1 against 3.9. That said, the two scores are not equally well evidenced: Workman's Calculator Pro has 51 ratings behind it against 9, so its average is the more settled of the two. Written reviews point the same way: 67% of Workman's Calculator Pro's written reviews are positive against 0% of Kopperfield's.
Workman's Calculator Pro ships an update fortnightly, Kopperfield every 3 weeks. The most recent releases landed on October 19, 2026 and October 20, 2026 respectively.
| Parameter | Workman's Calculator Pro | Kopperfield |
|---|---|---|
| Price | $1.99 | Free — better |
| Rating | 4.1 (51 ratings) — better | 3.9 (9 ratings) |
| Positive reviews | 66.7% of reviews — better | 0.0% of reviews |
| Number of ratings | 51 — better | 9 |
| Update frequency | Fortnightly — better | Every 3 weeks |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Ad-supported — better |
| Best chart rank | #98 — better | — |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 13.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 12 MB | 64 MB |
| Age rating | 4+ | 4+ |
| Developer | Bret Hardman | Kopperfield |
Customer experience
Workman's Calculator Pro
Kopperfield
In-app purchases
Workman's Calculator Pro
No in-app purchases
Kopperfield
No in-app purchases
Questions
Is Workman's Calculator Pro free?
Is Kopperfield free?
Which has better reviews, Workman's Calculator Pro or Kopperfield?
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