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SportWhat is body fat percentage
Body fat percentage is the proportion of total body mass made up of fat tissue. Unlike BMI, this metric distinguishes between fat and muscle mass, giving a more accurate picture of physical condition.
The US Navy method
This method estimates body fat percentage using body circumferences — neck, waist (and hips for women) — along with height. It was developed for the US Navy as a quick and inexpensive way to assess physical fitness without special equipment.
How to measure correctly
- Neck: below the Adam's apple, with the tape angled slightly downward at the front.
- Waist: at the navel level, standing straight, after a normal exhale, without sucking in.
- Hips (women): at the widest part of the buttocks.
Body fat percentage categories
- Essential fat: minimum required for basic physical function (men ~2-5%, women ~10-13%).
- Athletic: typical of elite athletes (men 6-13%, women 14-20%).
- Fitness: good physical condition (men 14-17%, women 21-24%).
- Acceptable: average healthy level (men 18-24%, women 25-31%).
- Obese: elevated health risk (men 25%+, women 32%+).
The tape measure method has an error margin of about ±3-4% compared to lab methods (DEXA scans, hydrostatic weighing). For a more precise body composition assessment, consult a specialist with the appropriate equipment.
FAQ
How accurate is the tape measure method?
The US Navy tape method has an error margin of about ±3-4% compared to lab methods (DEXA scans), but it's an accessible and free estimation method.
How do I measure waist circumference correctly?
Measure at the level of the navel, standing straight, without sucking in your stomach, after a normal exhale.
Why do men and women use different measurements?
The formula for women additionally accounts for hip circumference, since fat distribution differs between sexes.
Can I fully trust this result?
This is an estimate. For precise body composition, use DEXA scanning, hydrostatic weighing, or bioelectrical impedance analysis with a specialist.