Body Fat Calculator
Estimate your body fat percentage with Deurenberg or the Jackson-Pollock 3-site method. Categories by sex, lean mass, context-aware interpretation.
📐 How it is calculated
🧪 Cited studies
- Jackson, A. S. & Pollock, M. L. (1978) — Generalized equations for predicting body density of men, Br J Nutr: the reference skinfold equations.
- Siri, W. E. (1961) — conversion of body density → body fat %.
- Deurenberg, P. et al. (1991) — Body mass index as a measure of body fatness, Br J Nutr: the BMI + age equation, with its limits in athletes.
📋 Worked example
Worked example. A man weighing 80 kg estimated at 18 % body fat carries 14.4 kg of fat and 65.6 kg of lean mass. Goal: drop to 12 % while keeping muscle.
Notez cet outil
Moyenne : 5.0/5 · 1 vote
Phitnix is more than a coach. Your tools, your data and your coach in one place — to structure your progress instead of hoping for it.
Take action with Phitnix
The coaching platform that turns these numbers into real progress. Create your free account.
Create a free account
Free · 7-day premium trial · no credit card