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How it works
The U.S. Navy method estimates body fat from body circumferences (neck and waist, plus hip for women) relative to height. It's a quick, equipment-light estimate — less precise than a DEXA scan or calipers, and it can be off for very lean or very muscular builds.
| Category | Men / Women |
|---|---|
| Essential fat | 2–5% / 10–13% |
| Athletes | 6–13% / 14–20% |
| Fitness | 14–17% / 21–24% |
| Average | 18–24% / 25–31% |
| Above average | 25%+ / 32%+ |
How it's calculated
We estimate body-fat percentage from body circumferences using the U.S. Navy method: neck and waist (plus hip for women) together with height, via the Hodgdon–Beckett equations. It is an estimate, not a substitute for DEXA or calliper measurement.
How to use this calculator
- Enter your details — such as age, weight, and height — in the fields above.
- Choose any options that apply, like your activity level, goal, or formula.
- Read your result instantly. It updates as you type — no sign-up required.
Sources: Hodgdon JA, Beckett MB. Prediction of percent body fat for U.S. Navy men and women from body circumferences and height. Naval Health Research Center, 1984.
These calculators give general estimates for healthy adults and are not medical or dietary advice. For individual guidance, consult a registered dietitian or your healthcare provider.
Reviewed by the NutraPlanner nutrition team. · Last updated 2026-06-17
Frequently asked questions
How does the Navy body-fat method work?
It estimates body fat from the contrast between your waist (and hips, for women) and neck relative to your height, using circumference measurements and a logarithmic formula — no calipers needed.
How accurate is it?
It's a reasonable estimate for most people but less precise than a DEXA scan or skinfold calipers, and it can be off for very lean or very muscular builds. Measure snugly and consistently for best results.
What's a healthy body-fat percentage?
It varies by sex and age. Broadly, fitness ranges are around 14–17% for men and 21–24% for women; see the table below for typical bands.