Construction Master Pro Calc 12+

Feet Inch Fraction Calculator

Calculated Industries

Designed for iPad

    • 4.9 • 28.2K Ratings
    • Free
    • Offers In-App Purchases



Save time and reduce costly errors on all your jobs with the award-winning and industry-leading Construction Master™ Pro feet-inch-fraction builder's calculator!

FREE Try Before You Buy trial; your App Store account is not charged by Apple during the free trial.

The award-winning and industry-leading Construction Master™ Pro saves time and reduces costly errors!

As an app for your phone or tablet, it is ideal for anyone who works with dimensions and is interested in improving speed, accuracy, and productivity.

You get two apps: Construction Master Pro & Construction Master Pro Trig. Both include a built-in full User’s Guide and the ability to press and hold a key for specific help!

Built with the same core engine that powers the industry-standard advanced construction-math handheld calculators from Calculated Industries.


• Powerful built-in solutions make it ideal for completing layouts, plans, bids, and estimates
• Work in and convert between all common building dimensional formats US & Metric
• Built-in right angle functions simplify square-ups, rafters, slopes, and more
• Full trigonometric functions


• Dimensional Math and Conversions
• Feet-Inch-Fraction, Inch Fraction, Yards
• Decimal Feet and Inches (10ths, 100ths)
• Preset Fractions (1/2" through 1/64")
• D:M:S, Decimal Degree Entry and Conversions
• Full Metric Function (m, cm, mm)


• Complete Right Angle/Rafter Calculations
• Pitch Key (Slope and Grade)
• Rise, Run, Diagonal/Common Rafter Keys
• Regular and Irregular Hip/Valley & Jack Rafter Keys
• Rafter Cutting Angles (Plumb, Cheek, and Level Cuts)
• Stair Layouts (including – Riser Limit, Stairwell Opening, Headroom, Floor Thickness)
• Rake-Wall (including Arched)


• Square and Cubic
• Roof – Bundles, Squares, 4x8 Sheets, Pitch, Plan Area
• Drywall, Siding and Paneling 4x8, 4x9 and 4x12
• Column/Cone Area and Volume
• Basic & Advanced Circular Calculations
• Weight per Volume Conversions
• Length, Width, and Height Keys
• Blocks, Footings


• Trigonometric Function Keys: Sine, Cosine, Tangent, Arcsine, Arccosine, Arctangent
• Board Feet
• Studs: Find number On-center
• User-Definable Preferences
• Cost per Unit (total costs based on unit price)
• Equal-Sided Polygon
• Compound Miters
• Crown Angle
• Advanced Paperless Tape for all functions
• 4 Memories


• Entry-editing Backspace Key – enable with Legacy Mode or double-tap the display
• Searchable and Context-sensitive Help -- just press and hold any function key for Help text, diagrams, videos
• Ability to Save and Share calculations and outputs (e.g., cut-lists) to File or others on your crew
• NEW! Project Notes – Create text or voice-to-text notes & lists. Set up Folders by Project or Client. Shareable!
• NEW! EZ Calcs -- Easy forms-based calculators with illustrations to quickly and easily calculate quantities & costs for all kinds of common construction projects from balusters to blocks, rafters to rebar. Shareable!
• NEW! Refreshed look and feel for faster & simpler one-tap navigation and access.
• NEW! Searchable Help with additional how-to videos.

The first seven days are free. Subscriptions offered will automatically renew at the end of the chosen period. Upon purchase confirmation and completion of a free trial, payment will be charged to your Apple account. The subscription will automatically renew unless auto-renew is turned off or the subscription is canceled in settings at least one day (24 hours) before the subscription period ends. You can manage your subscription and turn off auto-renewal in your Apple account Settings > Account (Apple ID) > Subscriptions.

CONSTRUCTION MASTER is a common law trademark owned by Calculated Industries. Calculated Industries’ U.S. Trademark Registration Nos. 2138685 and 1569347 have expired. Calculated Industries owns U.S. Trademark Serial No. 97752159 for CONSTRUCTION MASTER.

Copyright 2024

What’s New

Version 12.5.42

Thanks for using Construction Master Pro. This latest update includes:
New Electrical chapter in EZ Calcs with 5 new topics.
Swipe-right in display to backspace - it's back!
Swipe-right to open menu - gone - you didn't like it, so we removed it!

Project Notes -- Say goodbye to scattered, disorganized notes and sticky pads. Create text or voice-to-text notes and lists for frequently referred to information like measurements, materials, Client details, and preferences. Set up Folders by Project or Client so you always have the necessary information. Plus, it can easily be shared via text, email, and more.

EZ Calcs -- Forms-based calculators with illustrations to quickly and easily calculate quantities and costs for common construction projects from balusters to blocks, rafters to rebar. Enter a few known parameters and let EZ Calcs solve the rest. These are shareable, too! If you have a favorite one you’d like to see, just let us know, as we’re always adding more!

Refreshed look and feel! The Navigation Bar on top and Tool Tray on the bottom put these new tools and some familiar old ones within easy reach for faster and simpler one-tap navigation and access. Smaller-screen users can now hide the tool tray to maximize the keypad size.

Searchable Help lets you find all mentions of any topic for faster and fuller Help. Now, with additional how-to keystroking videos.

Like these new improvements? Please leave us a review. Your ongoing feedback helps us keep improving our app!

Ratings and Reviews

4.9 out of 5
28.2K Ratings

28.2K Ratings

1carpenter ,

Construction Master Pro

I have used some version of this calculator for I believe the better part of thee decades now. I love the convenience of it being on my phone which is with 24/7. The only draw back is the screen shutting of and having to reopen my phone every time I want to enter something that it took a little bit of time to verify or measure. This could be changed in settings I am aware but as most of us, I don’t want my phone laying open indefinitely. For large projects I still use the stand alone calculator of the Construction Master Pro. The convenience of it always being with you without having to carry an extra device and how easy it is to load updates, makes it a must have for all serious carpenters or tradesmen.
Well done!

Developer Response ,

Thanks very much for the great review

Tlidahl ,

Best little calculator

I had purchased the stand alone calculator many years ago and the app at least 4 year’s ago. The calculator holder on my tool belt is a perfect fit for my phone. This is a great app as well as the stand alone. Best of all the help and manual is one click away if happen to forget the keystrokes for the stair layout or any other function. The app is similar in cost to the stand alone, but I would still own both. When I do not have phone in my tool belt the calculator is there. The new calculators have a tough plastic shell and the older version have an opening cover like a notebook. So I guess I own three. This is a great calculator layout for a builder.

Developer Response ,

Thank you very much for the great review.

But317 ,

Construction calculator

I found the original construction calculator at least 15 to 20 years ago. I have used them ever since that time, I have always had a couple in my truck one in the office one of my briefcase and several of them I have dropped broken over the years and had to replace. When I was looking to buy another new one I saw that they had the app online and now with it having it on my phone I have two on my desk there’s none in my truck there’s none in my briefcase it all works right off the phone and I haven’t broken it once. If you are in construction of any kind you should have this app on your phone.

Developer Response ,

Thank you for supporting us over the years!

App Privacy

The developer, Calculated Industries, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Linked to You

The following data may be collected but it is not linked to your identity:

  • Usage Data
  • Diagnostics

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    Some in‑app purchases, including subscriptions, may be shareable with your family group when Family Sharing is enabled.

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