FFMI Check
The fitness calculators serious lifters actually use
FFMI Check launched on July 1, 2026 with 3 votes, #8,766 of 24,623 launches that month and more than 50% of that year's launches.
What it does
Most fitness calculators online are either bloated with ads, hidden behind sign-ups, or built on outdated formulas like BMI.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.
Free TDEE calculator (Mifflin-St Jeor) + FFMI, body fat, macro & 1RM tools. Peer-reviewed formulas, mobile-first, no signup. Calculate your daily calories, macros, and metrics in seconds.
Calculate your Total Daily Energy Expenditure (Mifflin-St Jeor), FFMI, body fat, macros, and one-rep-max — peer-reviewed formulas, mobile-first, 100% free. Measure in the morning, fasted. Neck: below the larynx. Waist: at the navel (men) or narrowest point (women). Hip: widest point. The weight your body carries minus fat — muscle, bone, organs, water. Don't know your body fat %? Use the Body Fat calculator first. Why it matters: Lean mass is the main input for FFMI. Tracking it over time is a cleaner progress signal than scale weight — you can be losing fat and holding lean mass without the scale moving much. Mifflin-St Jeor — the gold-standard predictive BMR equation. Pulls your TDEE…from ffmicheck.com
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