Contact.

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What to write about

• Bug reports — a typo, a broken link, a miscalculation, a page that doesn't render on your phone. Screenshots and the URL of the page help.
• Clinical or numeric corrections — spotted a wrong cut-off, an out-of-date guideline, a mis-cited paper? Please cite the primary source. I'm a developer, not a clinician, and I rely on reviewers to catch errors.
• Accessibility feedback — the site aims for WCAG 2.1 AA. If a screen reader, keyboard, or zoom user hits a wall, tell me what browser / assistive tech you were using.
• Feature requests — calculators, charts, unit conversions, or languages you'd like to see added.
• Press or partnership enquiries — please include the publication / company and a deadline.

What I cannot help with

• Personal medical advice. I'm a developer, not a clinician. Please talk to your doctor, paediatrician, or registered dietitian for any health decisions. The calculator is a screen, not a diagnosis.
• Account or login issues. The site has no accounts. If your saved history is gone, it's because your browser's localStorage was cleared (browsers do this on "Clear site data").
• Custom calculators for pay. The site is free and ad-supported, not a consulting service.
• DMCA / legal threats — please see the Terms of Service for the correct notice procedure. I respond to properly addressed notices.

Response time

I read every message and reply within a few business days. If your message is time-sensitive, please mark the topic Press or partnership and include a deadline.

Other pages

• About this site
• Frequently asked questions
• Privacy Policy
• Terms of Service
• Disclaimer