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. 🔒 Privacy-first: All calculations happen in your browser (zero data collection) ⚡ Instant: No signup, no payment, no waiting 📚 Educational: Explains what your body fat % means for your health 📱 Works everywhere: Mobile, tablet, desktop

Figr AI: UX Agent for Product Teams — Learns your product. Thinks through UX

Learns your product. Thinks through UX

👋 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 (±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: ±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?

Figr AI: UX Agent for Product Teams — Learns your product. Thinks through UX

Learns your product. Thinks through UX

Body Fat Calculator

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

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