Feet-Inch-Fraction and Metric Conversion Calculator by Calculated Industries®

The Measure Master Pro app from Calculated Industries gives you the power to solve U.S. and metric unit conversions on your iPhone or iPad. 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.

Get professional results every time with this handy and easy-to-use tool for projects involving measurements.

Ideal for Designers, Tradespersons, Woodworkers, Craftsmen, Fabricators, Technicians, and Students

• Work in and convert between dimensions: feet-inch-fractions, inch fraction, yards, decimal feet (10ths, 100ths), decimal inches and metric (m, cm, mm)
• Find weight and weight per volume
• Instant solutions for circle area, circumference, arcs
• Length, Width and Height keys solve for linear, area, volume and perimeter dimensions
• Reduce expensive errors when estimating dimensions, costs and materials


• Created by Calculated Industries, the originator of the award-winning Construction Master® calculators
• Enter the numbers just as you would say them
• Built-in help – just press and hold the desired key for full, clear definitions, explanations and examples of keystrokes

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 (m, cm, mm)
• D.M.S. to Decimal Degree Conversions.
Dedicated Functions Help You Measure and Calculate:
• Linear
• Feet-Inch-Fractions
• Yards, Miles
• Decimal Feet/Inch
• Millimeters, Centimeters, Meters
• Area
• Feet, Inch, Yards, Acres, Miles
• Millimeters, Centimeters, Meters
• Square and Cubic
• Volume
• Feet, Inch, Yards, Miles
• Millimeters, Centimeters, Meters,
• Weight
• Pounds, Tons
• Metric Tons, Kilograms
• Weight per Volume
• Tons per Cubic Yard
• Pounds per Cubic Yard
• Pounds per Cubic Feet
• Metric Tons per Cubic Meter
• Kilograms per Cubic Meter
Special Functions
• Entry Editing Backspace Key – with a swipe of a finger
• Cost per Unit: Solve unit cost and pricing
• Advanced Paperless Tape
• Board Feet
• Memory function
• User-Definable Preferences — set custom options: Fractions, Area, Volume, Metric, Degrees.

What’s New

Version 10.5.0

Legacy Mode - the backspace key is back!
Go to Preferences to enable the backspace key.

Ratings and Reviews

3.7 out of 5
29 Ratings

29 Ratings

Mudbob ,

It’s not quite the same....

I have the physical version of this and use it daily in the woodshop. This app version is close but still different enough to notice it. It is also the most expensive App I’ve ever purchased so expected a bit more than a $3.00 alternative.

Pyre Quagmire ,

It’s all here!

My quest has come to a glorious end! I have been looking for an app like this for a long time...and wasting money in the process. Entering fractions into the app is simple and converts them to decimals with a push of the button. The desired unit button will allow you to step through all variations of that value. (Example: feet and fraction inches to decimal feet to all inches with fraction values to inches with decimal values to yards to metric and so on...) SOME of the other apps can do this too, but not in such a fluid manner. There are also very nice keys for various geometric calculations that are extremely intuitive and thorough. The list goes on and on. This was well worth every penny. Great job!

RemoteUser749383 ,

Used to be good

I bought this app as it’s one of the top three most useful things for drafting, engineering, field work. It used to just work, now, everyone I launch it i have to click through an ad. What the heck happened to just using things you paid for? Please clean up the weeds out of your walled garden apple.

Besides the ads, app is still very useful btw.

Developer Response ,

Hello, thank you for the feedback. In our apps what’s new section, which only opens on first launch after an update, we mention what is new with our app and we occasionally recruit people to our Tool Crew as well as announce other new products we make at Calculated Industries. Thank you, we do not advertise nor do we sell ad space.

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 Collected

The developer does not collect any data from this app.

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


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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