Estimate your body fat percentage in seconds using the US Navy method. Enter your measurements below for an instant result with a category rating — free, with no sign-up needed.
These figures are general estimates only and are not medical advice.
How to Use
- Select your sex and enter your height.
- Measure your neck and waist in centimetres (plus hips for women).
- Click Calculate Body Fat to see your percentage and category.
- Press Clear to start over.
Key Features
- US Navy body fat formula for men and women.
- Instant category rating, from essential fat to obese.
- Metric measurements with sensible validation.
- General estimates only — this tool is not medical advice.
- 100% private — everything is calculated in your browser.
FAQs
Is this body fat calculator free?
Yes. It is completely free with no sign-up and no limits.
How is body fat estimated?
It uses the US Navy method, which estimates body fat from your height and tape measurements of your neck, waist and (for women) hips.
How accurate is the result?
It is a general estimate only and is not medical advice. Tape-measure methods are handy for tracking change over time, while laboratory methods such as DEXA scans are more precise.
Is my data stored anywhere?
No. All calculations happen in your browser and nothing you enter is sent or stored.
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