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Body Fat Calculator

Body Fat Calculator

Free body fat calculator using U.S. Navy method no signup

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BMI treats muscle and fat the same. That's why Tom Brady is "overweight" and The Rock is "obese" according to BMI. Body Fat Calculator uses the science-backed U.S. Navy circumference method to give you a more accurate picture of your body composition. šŸ”’ Privacy-first: All calculations happen in your browser (zero data collection) āš” Instant: No signup, no payment, no waiting šŸ“š Educational: Explains what your body fat % means for your health šŸ“± Works everywhere: Mobile, tablet, desktop
Body Fat Calculator gallery image
Body Fat Calculator gallery image
Free
Launch tags:Calendarā€¢Medicalā€¢Web Design
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Framer
Framer
Launch websites with enterprise needs at startup speeds.
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Ludy
Maker
šŸ“Œ
šŸ‘‹ Hey Product Hunt! I'm the maker of Body Fat Calculator. **Why I built this:** Six months into my fitness journey, BMI told me I was "overweight" (25.1). But I could see my abs. I was hitting PRs every week. That's when I realized BMI is broken. It's from 1832 and treats muscle like fat. DEXA scans are the gold standard (Ā±1-2% accuracy) but cost $150 each. That's $1,800/year if you track monthly. The U.S. Navy solved this in 1984 with a tape measure. Accuracy: Ā±3-4%. Cost: $0. So I built this tool with three principles: 1. **Privacy-first**: All calculations happen in your browser. I literally can't see your data. 2. **Zero barriers**: No signup, no payment, no email. 3. **Educational**: Getting "17% body fat" is meaningless without context. **Tech stack:** - Pure JavaScript (zero dependencies) - No backend (just HTML/CSS/JS) - Hosted on Netlify Happy to answer any questions! What would you add/change?