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Units
Sex
Method
Body Fat
Fat Mass
12.7 kg/ 28.0 lbs
Lean Mass
62.3 kg/ 137.4 lbs
| Category | Range (%) |
|---|---|
| Essential Fat | 2–5% |
| Athletes | 6–13% |
| Fitness | 14–17% |
| Acceptable | 18–24% |
| Obese | ≥ 25% |
Disclaimer: The Navy formula is an estimate (±3–4% accuracy). DEXA scan is the gold standard for body composition. These results are educational only — not medical advice.
Body Fat Percentage Calculator estimates body fat percentage using the US Navy circumference method and the Deurenberg BMI formula, showing fat mass, lean mass, and your fitness category.
Body Fat Percentage Calculator is a high-performance utility designed to help users streamline their workflow. Built with modern web technologies, it ensures fast processing times and high-quality outputs directly in your browser.
US Navy formula (men): %BF = 86.01 × log10(waist − neck) − 70.041 × log10(height) + 36.76. Women: 163.205 × log10(waist + hip − neck) − 97.684 × log10(height) − 78.387. Deurenberg (1991): %BF = 1.20 × BMI + 0.23 × age − 10.8 × sex − 5.4 (sex: 1 = male, 0 = female). All measurements in cm. Body fat formulas are population-level estimates; DEXA or hydrostatic weighing provide clinical accuracy.
The US Navy formula is typically accurate within ±3–4% of DEXA scan measurements when measurements are taken correctly. It's less accurate for very lean or very obese individuals. DEXA scanning is the gold standard.
For men: Athletes 6–13%, Fitness 14–17%, Acceptable 18–24%, Obese 25%+. For women: Athletes 14–20%, Fitness 21–24%, Acceptable 25–31%, Obese 32%+. Essential fat (not safely reducible) is ~2–5% for men, ~10–13% for women.
Measure at the narrowest point of the torso — usually 1 inch above the navel. Stand relaxed and breathe normally. Don't suck in your stomach. Take the measurement after exhaling.
Lean body mass = total weight − fat mass. It includes muscle, bone, organs, and water. Preserving lean mass during fat loss is critical — this is why adequate protein intake and resistance training matter so much when dieting.
Free BMI calculator with metric and US units, WHO-based adult categories, and clear medical disclaimers.
Find your ideal body weight using 4 medical formulas — Robinson, Miller, Devine, and Hamwi.
Find your daily calorie needs using the Mifflin-St Jeor equation for any goal.