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💪 Body Fat Calculator
The US Navy body fat formula uses tape measurements (neck, waist, and for women hip) plus height to estimate body fat percentage. Quick, no equipment needed beyond a tape measure.
Examples
M, 180 cm, neck 38, waist 85~17% body fat (fitness range)F, 165 cm, neck 32, waist 70, hip 92~24% body fat (fitness range)Frequently asked questions
How accurate is the Navy method?
Within ±3-4% of DEXA scan results for most adults — much better than BMI for assessing body composition, much worse than DEXA.
How do I measure correctly?
Neck: just below the larynx. Waist: at the navel (men) or narrowest point (women). Hip: at the widest point. Tape snug but not compressing.
What's a healthy body fat range?
Men: 10-20% healthy. Women: 18-28% healthy. Athletes can be lower; "essential fat" (~5% M, ~12% F) is the minimum safe.
About this tool
Body Fat Calculator runs entirely in your browser using standard Web APIs. No data is sent to any server. The source for this tool is in our public GitHub repository.
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Why this tool
vs typical free web-tool sites
| 1vw | Typical free site | |
|---|---|---|
| Price | Free | Free |
| Signup required | No | Often (for premium features) |
| Ads inside the tool | No | Yes (banner + video) |
| Data sent to server | No (browser-only) | Yes (inputs analyzed for ads) |
| Total tools | 96 | Often <20 or scattered across sites |
| Bookmarkable URL per tool | Yes | Mixed |
| Loads in under 1s | Yes (static) | Often slow (ad tracking) |
| Multilingual | EN / ES / PT / FR / DE | Usually EN only |
| Open source | Yes | No |