Construction Master 5

In-app purchases
1.2K reviews
Content rating
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About this app

FREE Try Before You Buy trial, your Google account is not charged by Google during the free trial.

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 Android device to a non-Android 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 Google 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 Play Store account Settings > Payments & subscriptions > 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 is the owner of U.S. Trademark Serial No. 97752159 for CONSTRUCTION MASTER.

Copyright 2023
Updated on
Mar 10, 2023

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
This app may collect these data types
Personal info, Financial info and 2 others
Data is encrypted in transit
Data can’t be deleted
1.2K reviews
Adam Campbell
March 12, 2023
Wonderful calculator. I use the physical version daily at work and it's so nice to not have to spend an additional $40 to get the same functionality at home. Update 3/11/23: new update requires you to manually locate your transaction ID through your Google account. I'm sure for security reasons, but I bought this app in 2015, 7 years ago. Do you know how many other purchases I've made through Google? There has to be a better way.
6 people found this review helpful
Did you find this helpful?
Calculated Industries
March 12, 2023
Hey Adam, please reach us at, we will fix you up easy-peasy!
michael bredemeyer
March 27, 2023
I won't be paying for a subscription to this C5 app that I bought several years ago and have been able to cross over to every phone I've had till now, I bought this app when it was new. You folks have never locked me out of it before. I'm disappointed. It's a fantastic app, but I'll function without it.
Did you find this helpful?
Calculated Industries
March 27, 2023
Michael, reach us at to get you corrected, your original purchase is safe. Thank you.
marthin guinto
March 24, 2023
It's asking for Transaction ID that nobody pays attention to. I've also had and used this app for over 5 years now so I wouldn't know where to start looking for the ID. Please point me and other users to the right direction. This is a waste of time. Other than that the app's amazing
2 people found this review helpful
Did you find this helpful?
Calculated Industries
March 24, 2023
Don't worry - we will get your app back on your phone for you. Please contact us at and we will obtain that information for you.

What's new

Maintenance updates
Licensing updates
Bug fixes