Body Fat % U.S. Navy Method
Uses body circumference measurements — no calipers needed.
The U.S. Navy tape method
This calculator uses the U.S. Navy circumference method, which estimates body fat from your height and a few tape measurements rather than skinfold calipers or an expensive scan. It is accurate to within roughly 3–4% for most people and, more importantly, is consistent — making it an excellent way to track changes over time.
Measuring correctly
- Waist — measured at the navel, relaxed (not sucked in)
- Neck — just below the larynx, sloping slightly down to the front
- Hip (women only) — at the widest point
Add your body weight to also see your estimated fat mass and lean mass in kilograms.
Frequently asked questions
How accurate is the U.S. Navy body fat method?
It is typically accurate to within about 3–4% compared with a DEXA scan. Its real strength is consistency: measured the same way each time, it reliably tracks whether your body fat is trending up or down.
How do I measure my waist and neck?
Measure the waist horizontally at the navel while relaxed, and the neck just below the larynx (Adam's apple). Keep the tape snug but not compressing the skin.
What is a healthy body fat percentage?
For men, roughly 10–20% is considered fit to healthy; for women it is roughly 18–28%. Essential fat (very low single digits for men) is not a healthy target to chase.