Rule of 3 Calculator

Contains adsIn-app purchases
Content rating
Everyone
500+
Downloads
Content rating
Everyone
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About this app

Calculate simple rule of 3 quickly, accurately and easily with this proportions calculator. Ideal for studies, work and everyday tasks, the app helps you find proportional values in seconds.

The rule of 3 calculator allows you to find an unknown number based on the relationship between known values, making proportion calculations simple and efficient. Just enter the data and get the result instantly.

The interface is clean, lightweight and intuitive, designed for speed and usability. Perfect for students, professionals and anyone who needs to calculate proportions quickly.

If you are looking for a fast, simple and reliable rule of 3 calculator, this app is the ideal solution.
Updated on
Apr 24, 2026

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.
This app may share these data types with third parties
Device or other IDs
This app may collect these data types
Device or other IDs
Data isn’t encrypted
Data can’t be deleted

What’s new

Improvements to proportion calculations, performance enhancements and bug fixes for a faster and more accurate experience.
Content rating
Everyone
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App support

About the developer
André Roberto Reginaldo Fortunato
rrandsky@gmail.com
R. Marcio de Andrade, 346 Forquilhas SÃO JOSÉ - SC 88107-797 Brasil

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