Rule-Of-Three Calculator

mbar Software

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!

Ratings and reviews

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!!!

Best proportion calculator ever! Small app, no ads, easy to use. Siple and it works! 5+ stars

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...!

What’s new

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