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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Most fitness calculators online are either bloated with ads, hidden behind sign-ups, or built on outdated formulas like BMI.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
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About FFMI Check on Product Hunt
“ The fitness calculators serious lifters actually use ”
FFMI Check was submitted on Product Hunt and earned 4 upvotes and 1 comments, placing #113 on the daily leaderboard. Most fitness calculators online are either bloated with ads, hidden behind sign-ups, or built on outdated formulas like BMI.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.
FFMI Check was featured in Health & Fitness (82.9k followers), Productivity (655.6k followers) and Fitness (1.7k followers) on Product Hunt. Together, these topics include over 174.3k products, making this a competitive space to launch in.
Who hunted FFMI Check?
FFMI Check was hunted by Sami renkyorgancı. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
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Sami renkyorgancı