FFMI Check - The fitness calculators serious lifters actually use

Most fitness calculators online are either bloated with ads, hidden behind sign-ups, or built on outdated formulas like BMI. FFMI Check is a single-page hub for the four metrics serious lifters actually track: FFMI + Normalized FFMI (Kouri 1995), TDEE (Mifflin-St Jeor), daily macros, and 1RM (Epley + Brzycki averaged). Mobile-first, zero accounts, zero data stored — every calculation runs locally in your browser.

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

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