Composed Rule of Three

Composed Rule of Three is a handy Chrome extension designed to make performing rule of three calculations simple and fast. Whether you're calculating costs, work rates, or quantities, this tool helps you solve direct, inverse, simple, or compound proportions with ease — just like the cross-multiplication exercises you learned in school.

This extension is perfect for everyday situations such as determining the price for multiple items based on unit cost, figuring out how long multiple workers will take to complete a project, or calculating output rates. With a user-friendly interface, it reinforces essential math concepts and helps verify your results quickly. Ideal for students, professionals, and anyone who deals with proportional reasoning in daily life.