Last updated: November 14, 2026
Math tools should work for everyone. That includes students who use screen readers, people who navigate with a keyboard, and anyone who needs larger text or stronger contrast. So, Proportion Calculator aims to meet the Web Content Accessibility Guidelines (WCAG) 2.2 at Level AA, the standard published by the World Wide Web Consortium.
What We Do to Make Our Tools Accessible
| Area | What we do |
|---|---|
| Keyboard use | You can reach every input, button and result with the Tab key, and press Enter to calculate |
| Screen readers | Every input has a clear label, such as “first numerator”, and results are announced when they appear |
| Color contrast | Our text and button colors meet a contrast ratio of at least 4.5 to 1 against their backgrounds |
| Zoom and text size | Pages stay usable when you zoom to 200 percent, and text uses relative sizes |
| Mobile devices | Every calculator works on phones and tablets, with large tap targets |
| Math notation | We write formulas in plain text, such as a × d = b × c, so screen readers can read them aloud |
| Errors | When an input is invalid, we explain the problem in words, not just with a red border |
Steps Read Like Sentences
Our step by step solutions do more than list numbers. Each step says what happens in plain language, for example, “Multiply 8 by 3 to get 24.” This helps screen reader users and anyone who learns better by reading than by scanning symbols.
Known Limitations
We are still building parts of the site. Therefore, some areas may not fully meet our goal yet:
- Graphs in our direct and inverse proportion tools may be hard to read with a screen reader. We provide the same values in a table next to each graph.
- Some older third party content, such as ads, may not meet WCAG standards. We do not control how those ads are built.
We are working to fix these gaps.
Tell Us About a Barrier
If any part of Proportion Calculator is hard for you to use, please tell us. Email proportioncalculator.marketing@gmail.com with the subject line “Accessibility”. Include the page link, what you tried to do and the device or assistive technology you used.
We reply within two business days. Where we can, we will also give you the result you need in another format while we fix the problem.
Our Ongoing Commitment
We test new calculators with a keyboard and a screen reader before launch, and we review existing pages whenever we update them. Accessibility is part of how we build, not an extra we add later.