Construction Master 5 4+

Feet Inch Fraction Calculator

Calculated Industries

Designed for iPad

    • 4.9 • 4.7K 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® 5 feet-inch-fraction builder's calculator!

For over 30 years the Calculated Industries Construction Master handheld calculator has been the trusted go-to tool by top carpenters and framers all across North America and beyond.

As an app for your phone or tablet it is ideal for busy Builders, Contractors, Designers, Fabricators, Framers/Carpenters, Tradesmen of every specialty and even Advanced Do-It-Yourselfers -- Anyone who works with dimensions who is interested in improving speed, accuracy and productivity.

It operates exactly as the handheld Construction Master 5, along with added app-exclusive features. It includes a full User’s Guide built-in, as well as the ability to press and hold a key for specific help! Even includes tutorial videos.

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 in the field, office or truck
• Work in and convert between all building dimensional formats: feet-inch-fractions, inch fraction, yards, decimal feet (10ths, 100ths), decimal inches and metric (m, cm, mm)
• Built-in right angle functions simplify square-ups, rafters, slopes and more
• And so much more.

• Entry Editing Backspace Key – with a swipe of a finger (left - to - right)
• Context-sensitive Help -- just press and hold any function key for Help text, diagrams, videos
• Ability to Save or Email calculations and outputs (e.g., cut-lists) to File or others on your crew

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

Right Angle Solutions
• Complete Right Angle/Rafter Calculations
• Pitch Key (Slope and Grade)
• Rise, Run, Diagonal/Common Rafters
• Hip/Valley Key
• Jack Rafters Key
• Irregular Hip/Valley and Jacks
• Rafter Cutting Angles (Plumb, Cheek and Level Cuts)
• Stair Layout Key
• Diagonal Key
• Expanded Rake-Wall

Area and Volume Solutions
• Square and Cubic
• Basic Circular Calculations
• Weight per Volume Conversions

Special Functions
• Board Feet
• User-Definable Preferences
• Entry Editing Backspace key – with a swipe of a finger
• Cost per Unit (total costs based on unit price)
• Advanced Paperless Tape (shareable)
• Memory function

And while perhaps obvious, if you change from an iOS device to a non-iOS device, you WILL need to buy a new license as they are incompatible.

The first 7 days are free. Subscriptions offered will automatically renew at the end of the chosen period. Payment will be charged to your Apple account upon purchase confirmation. The subscription will automatically renew unless auto-renew is turned off or 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 > Subscriptions.

Construction Master® is a registered trademark of Calculated Industries, Inc.

What’s New

Version 11.4.11

Fixes to launch sequence

Ratings and Reviews

4.9 out of 5
4.7K Ratings

4.7K Ratings

sqr and strt ,


Talk about the most bang for your buck. I have been using since came on market . Don’t even remember when that was many years ago. I have tried other construction calculators for my crews and nothing works like this one. Now with the phone app I don’t need to have a hand held in every truck. By far the best construction calculator on the market.

Developer Response ,

Great, thank you for the feedback and 5-stars!

plumbob1256 ,

Quality app.

I bought this app a year ago. I use it everyday. I used to have to carry a calculator around with me but now I just use my phone.

Developer Response ,

Hello Plumbob, you do not have to buy again. *** your original purchase is safe ***

There are two reasons you might be seeing our subscription screen even though you purchased it in the past:
1) your Apple ID has changed, to fix this please log into the Apple ID used for the original purchase and then relaunch the app
2) if the app was recently updated to our latest version, and then you attempted to run it the first time after update with no Wifi or no Cellular Data turned on, we cannot validate your original purchase, to fix this please enable WiFi or Cellular Data in your Settings app and re-launch the app

If you still have problems, please reach us at

Hilwafa ,

Bait and switch!

I actually have one of the hand-held calculators however it’s always in my work vehicle so I thought wow this would be great to have at home. I downloaded the app because it said it was free. The moment I did that it then said this was a seven day trial and your Apple account would be charged at the end of the seven days. Big problem though, it doesn’t tell you how much it’s going to be. this should have been up front on the details page and it’s not that I could see. If it was it wasn’t obvious. Can you spell SCAM!

Developer Response ,

Wow, not bait and switch, but thank you for the feedback. There is only so much detail we can put on the very first screen which you've clearly read. Right up front we explain free trial. The subscription screen, which you cannot get past without starting the free trial, explains pricing and free trial --- again. So sorry you were not able to read it all and make sense out of it, thank you for looking though.

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

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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