This utility app helps you solve problems involving ratios and proportions. It calculates an unknown number based on the relationship between two other known numbers.
Rule of Three Calculator by Saran Dumronggittigule


16+ similar apps compared and reviewed
Pool Chem Calculator is great, but it's not the only option. Explore 16+ similar apps for iPhone and iPad, each reviewed and rated by real users. Find free alternatives, premium upgrades, and hidden gems.


This utility app helps you solve problems involving ratios and proportions. It calculates an unknown number based on the relationship between two other known numbers.



This app provides comprehensive mobile services for campus cards, including traditional card functions like consumption and authentication, enhanced with QR code capabilities. It offers features for managing your campus card, paying various campus fees, and booking campus facilities.






Easily determine the capacity of structural steel beams and columns. Get detailed calculation sheets to verify your work, designed according to AISC 360-16 standards. Features intuitive touch-based interaction and built-in material databases.




This app helps you maintain a clean and safe pool or spa with smart testing, tailored advice, and customized task lists. It offers advanced AI for instant feedback, problem resolution guidance, and comprehensive sanitization support. Track multiple pools, manage inventory, and even collaborate with others for effortless pool care.


Easily manage your swimming pool's water chemistry by tracking key levels like chlorine and pH. This app calculates the precise amounts of chemicals needed to maintain clear, algae-free water, offering a cost-effective alternative to pool store advice.


This app provides expert water analysis for your swimming pool using test strips or kits. It offers personalized maintenance plans, reminders, and troubleshooting tips to keep your pool clean and swim-ready. You can also add recommended products to a shopping cart for purchase.


This app simplifies pool water chemistry by providing instant maintenance plans based on test results. It offers customized guidance on chemical additions, pool profiles, and expert tips to help you maintain a healthy pool without complex math or reliance on store advice.