The stuff people actually ask, answered without the fluff.
No. Every calculation happens entirely in your web browser using JavaScript. Your height, weight, and results are stored in your browser’s localStorage only. We never see, collect, or transmit any of your personal data. You can clear it anytime by deleting your browser data for bmitool.org.
The calculators use established formulas (Mifflin-St Jeor, Harris-Benedict, Navy method, etc.) that are widely accepted in research and clinical settings. However, they are estimates, not diagnoses. Individual variation in metabolism, body composition, and genetics means real-world results may differ. Always consult a healthcare provider for personalized advice.
Yes. Every calculator and article is fully responsive and tested on iOS Safari, Chrome for Android, and mobile Firefox. The BMI calculator even works offline after the first visit if you add the site to your home screen.
Each tool has a “Clear History” or “Reset” button. Alternatively, open your browser settings, find “Site Data” or “Cookies and Site Data,” search for bmitool.org, and delete stored data.
Absolutely not. We do not collect personal data, so there is nothing to sell. The site displays generic banner ads (when enabled) through standard ad networks, but these do not use your health data for targeting because we never have it.
Most tools include a “Share” or “Export” button that generates a plain-text summary or PNG chart you can copy, download, or post anywhere. No account required.
All articles are written by James Whitfield, a health data analyst with a B.S. in Kinesiology and ACSM certification. Sources are cited inline, and methodology is described transparently. No ghostwriters, no AI-generated content without disclosure.
New articles are published roughly every two weeks. Calculator formulas are reviewed quarterly against the latest peer-reviewed research. If you spot an error, email contact@bmitool.org.