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  • #: 226984
  • Price: $0.99 In Apple Store
  • Category: Utilities
  • Updated: 2012-04-09
  • Current Version: 1.1.3
  • 1.1.3
  • Size: 0.20 MB
  • Language: English
  • Seller: Jean-Paul Lanaux
  • Requirements: Compatible with iPhone, iPod touch, and iPad. Requires iOS 2.2 or later
  • © ConCalc by Jean-Paul Lanaux
  •  Add to Favorite apps



ConCalc (CONtractor's CALCulator) is a feet, inch, mm, and fraction calculator with a much improved triangle solver also included. ConCalc was designed for individuals who frequently perform computations with imperial fractions (draftsmen, estimators, engineers, architects, and or construction personnel).

The objective of ConCalc is to provide a Foot-inch calculator that would be intuitive, easy to use, and fast. Since most professionals who deal with fractions, also regularly solve triangle problems, ConCalc also solves all types of triangle problems (right triangles, acute, obtuse, etc). Just provide three known values, and the calculator will produce the other three un-supplied values.

It is strongly suggested that you review the videos on youtube that demonstrate what this calculator does and how it works. Just search "ConCalc" on youtube or visit www.jplanaux.com.

Not sure that you want to purchase the application? View a video at our web site. www.jplanaux.com

Input in the FT-IN mode: The input key stokes have been optimized for the fewest key stokes possible and will be equal to the qty of digits that represent the feet, the foot mark, one key for the inch, and one key for the fraction. So for example, 12'-11 15/16" will be entered with 5 key inputs: "1", "2", "FT", "11", and "15/16".


The user is required to provide three of the six parts (two for a right triangle: the third angle would be set to 90 degrees) which make up a triangle. The input to this calculator is through the Calculator view:

Step 1: Enter three pieces of data using the appropriate side or angle button.

Step 2: Press "Solve Triangle"

Step 3: View results.

Note: The format of the output is determined by the current mode (indicated by the blue button on the calculator). For example, if the mode is decimal, the output will be decimal. If the mode is FT-IN, then the output will be FT-IN. Angles are always output as decimal degrees.

What's New in Version 1.1.3

Revised triangle solution screen text field widths to accept more digits.

iPhone Screenshots

ConCalc iPhone Screenshot 1
ConCalc iPhone Screenshot 2
ConCalc iPhone Screenshot 3
ConCalc iPhone Screenshot 4

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Rated 5/5 based on 3 customer reviews.


5/5 stars

Great app

Great app! Especially for $0.99! Works as described. I like the way I don't have to lug around a fraction calculator around with me. I can just use my iPhone! I have been using this app for days and it proves to be useful, reliable and accurate. The triangle calculator is an added plus.

5/5 stars

Piper / Mapper

Great App! Very usefull in the field or office.

5/5 stars

Great app

This is a great app. It is real handy and easy to use. I would suggest this app to everyone. Good job.


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The information may be outdated (2017-03-08 19:48:10). For actual information go to iTunes

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