Rule-Of-Three Calculator

4.9
277 reviews
10K+
Downloads
Content rating
Everyone
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About this app

The "Proportion Calculator" is the first tool in the "mbar School Tools" series.

This App calculates proportions (direct or indirect), also known as "rule of three" by entering three known values and hitting "Calculate". The App will calculate the missing value for you!

NEW in Version 2.0: The formula used for calculation can be shown with all details after a calculation has been made!
You can use this feature to increase your understanding in solving the rule-of-three.

A history of calculated values is kept and can be managed within the App.

Dark Mode is supported and can easily be switched with the black/white icon in the top right corner.

- mbar School Tools are free to use, have no ads, and will mostly require no special permissions!
Updated on
May 13, 2021

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
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No data collected
Learn more about how developers declare collection

Ratings and reviews

4.9
269 reviews
Ph.Rho. GR67
April 23, 2022
Very practical, handy and easy to use app! I always use it in my kitchen, and as a pro at work, for accurate calculations! Well done!!!
1 person found this review helpful
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Nikola Sehovac
January 27, 2024
Best proportion calculator ever! Small app, no ads, easy to use. Siple and it works! 5+ stars
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Jitendra Kumar
October 27, 2020
Perfect app. There is a my grocery shop, this app helps too. Very simple app. Only fix the rate and calculate how much you can...!
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What’s new

Hotfix: Solved a crash when showing/hiding the keyboard.

App support

About the developer
Michael Barthold
mbarsoftware@gmail.com
Austria
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