Hey Product Hunt 👋 I built FFMI Check after getting frustrated with the state of fitness calculators online. Most of them either: - Bury the result behind 3 ad popups - Force an email signup before showing you a number - Use BMI (a 200-year-old equation) to classify athletes as "obese" I wanted a single, fast page that runs four science-backed calculators side by side: → FFMI + Normalized FFMI (Kouri et al. 1995 — the gold standard for muscularity) → TDEE using Mifflin-St Jeor (the most accurate predictive BMR equation) → Daily macro split (4/4/9 kcal/g, three goal modes) → 1RM via averaged Epley + Brzycki (better than either formula alone) A few principles: • Mobile-first, every input triggers a numeric keypad • 100% client-side — your weight, height, body fat never leave your browser • No signups, no email walls, no upsells • Open about every formula used (linked to source studies) This is my first solo launch and I'd genuinely love feedback — what's missing, what's confusing, what could be a separate tool entirely. Roast it. Thanks for taking a look

FFMI Check

The fitness calculators serious lifters actually use

The fitness calculators serious lifters actually use