Accessibility statement

Our commitment

We want Health Calculations to be usable by as many people as possible, regardless of ability, device, or the assistive technology they use. Accessibility is part of how we design and build the site — not an afterthought — and improving it is ongoing work that never really finishes.

What we aim for

We use the Web Content Accessibility Guidelines (WCAG) 2.2, level AA, as the reference point for our design and testing decisions. This statement describes a good-faith, ongoing effort rather than a formal certification, audit result, or guarantee of conformance with any particular standard.

What we've built in

• Semantic HTML with proper landmarks, heading structure, and a "skip to main content" link on every page.
• Full keyboard operability — every calculator, menu, tooltip, and expandable section works without a mouse, with visible focus indicators.
• Labels on every form field, and calculator results that are announced to screen readers when they update.
• A color palette checked for sufficient text contrast, and information that never relies on color alone.
• Respect for your system's reduced-motion preference — animations and transitions are disabled when you've asked for less motion.
• Layouts that reflow for small screens and high zoom levels without horizontal scrolling, with browser zoom never blocked.
• Charts and visual scales accompanied by text equivalents of the information they show; purely decorative graphics are hidden from assistive technology.
• No time limits, autoplaying media, or flashing content.

How we test

We test the site with automated accessibility tools (including WebAIM's WAVE and Deque's axe), manual keyboard-only passes, and checks at mobile widths and high zoom. Automated tools can't catch everything, which is one reason your feedback matters — see below.

Known limitations

• Calculator pages cite external sources (for example PubMed, WHO, and FAO publications). Those sites are outside our control and may not meet the same accessibility goals.
• Assistive technologies vary. We test against common browser and screen-reader combinations, but we can't verify every pairing, and behavior may differ in older software.
• The site evolves. New features occasionally introduce issues we haven't caught yet — when we find them (or you tell us about them), we fix them.

Feedback and contact

If anything on this site is hard to use with your device or assistive technology — or you just spot something we could do better — please tell us. Email [email protected] with the page address and a short description of the problem. We read these, we prioritize fixing real barriers, and we're happy to provide the information you were after in another form in the meantime.

Changes to this statement

As the site and our testing evolve, we'll revise this statement and update the "Last updated" date above.