📏 Body Fat Estimator
Estimate your body fat percentage using the U.S. Navy method. Requires a measuring tape for waist, neck, and height measurements.
U.S. Navy Body Fat Estimator
This calculator uses the U.S. Navy body fat estimation method, which relies on circumference measurements. For men, it uses waist and neck measurements. For women, it also includes hip measurement. The method was developed by the U.S. Department of Defense and is widely used as a field-tested estimation tool.
How to Measure
- Waist (men): Measure at the navel (belly button), at the narrowest point.
- Waist (women): Measure at the narrowest point, typically above the navel.
- Neck: Measure just below the larynx (Adam's apple), with the tape sloping slightly downward at the front.
- Hip (women): Measure at the widest point of the hips/buttocks.
Frequently Asked Questions
How accurate is the Navy method for body fat?
The U.S. Navy method is accurate to within 3–4% of DEXA scan results for most people. It is more accurate for individuals within normal body fat ranges and less reliable for very lean or very overweight individuals. It is considered one of the best non-clinical estimation methods.
What is body fat percentage?
Body fat percentage is the proportion of your total body weight that is fat. It differs from BMI because it distinguishes between fat mass and lean mass (muscle, bone, organs, water). A healthy body fat percentage depends on age and gender.
What are healthy body fat ranges?
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 for reproductive health.
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