About the method
The US Navy formula uses the logarithm of your circumference measurements relative to height to estimate body fat. It is widely used because it is simple and reasonably accurate without special equipment.
General body-fat ranges
- Men: essential 2–5%, athletes 6–13%, fitness 14–17%, average 18–24%, higher 25%+.
- Women: essential 10–13%, athletes 14–20%, fitness 21–24%, average 25–31%, higher 32%+.
Frequently asked questions
How does the US Navy method work?
It estimates body fat from body measurements — height, neck and waist (plus hip for women) — using a validated formula. It is quick and needs only a tape measure.
How accurate is it?
For most people it is within a few percentage points of more advanced methods. Measure carefully and consistently for the best results.
What measurements do I need?
Height, neck and waist circumference for everyone, and additionally hip circumference for women. Measure relaxed, without compressing the skin.
For general information only — not medical advice.