Body Fat Calculator
Enter a few body measurements to estimate your body fat percentage with the U.S. Navy method.
How to use it
- Choose your sex Women also enter hip measurement.
- Measure and enter Height, neck and waist (and hip) in centimetres.
- Read your estimate See your estimated body fat percentage.
Examples
| M, 180/38/85 | ~17% |
|---|---|
| Careful tape | best results |
About this tool
This calculator estimates your body fat percentage using the U.S. Navy circumference method, which relies on a few simple tape measurements rather than special equipment. It’s a quick way to track changes over time.
Like all tape-based methods it is an estimate, not a clinical measurement, and it is not medical advice. For consistent results, measure in the same way each time. All calculations happen in your browser and nothing is uploaded.
Frequently asked questions
How accurate is the Navy method?
The tape method is a reasonable estimate for most people but less precise than methods like DEXA. Measure carefully and consistently.
Where do I measure?
Neck below the larynx, waist at the navel, and (for women) hips at the widest point. Keep the tape level and snug.
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Updated June 12, 2026