Uses the U.S. Navy circumference formula (Hodgdon & Beckett, 1984). Tape estimates are typically within ±3–4% of lab methods — good for tracking your trend, not for medical decisions. This tool stores nothing and sends nothing; it runs entirely in your browser.
Healthy body fat ranges
Reference categories from the American Council on Exercise: for men — essential fat 2–5%, athletes 6–13%, fitness 14–17%, average 18–24%, obese 25%+. For women — essential fat 10–13%, athletes 14–20%, fitness 21–24%, average 25–31%, obese 32%+. Women naturally carry more essential fat; comparing your number to the wrong column is the most common mistake with these calculators.
The number itself matters less than its direction over time. Measure monthly, same time of day, same tape positions — and focus on the daily habits (training, protein, sleep) that move it.
Body composition is a habit outcome, not a goal you can do in a day. Habitanics turns those daily habits into a garden that grows as you stay consistent.
