Body Fat Percentage Calculator
Estimate body fat % using US Navy method: waist, neck, height, and sex. Example: male 34 in waist, 15 in neck, 70 in height → ~20%. Not medical advice.
Body fat percentage can be estimated with the US Navy method using waist, neck, and height (and sex). No calipers required. Enter measurements in inches or cm. The calculator uses the appropriate formula. The result is an estimate only. This tool is for informational use only and is not medical advice. See the disclaimer below.
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Examples
- Male: waist 34 in, neck 15 in, height 70 in → ~20%
- Female: waist 28 in, neck 13 in, height 64 in → ~25%
- Male: waist 90 cm, neck 38 cm, height 178 cm → ~18%
FAQ
What is the US Navy method?
A formula using waist circumference, neck circumference, and height (and sex) to estimate body fat percentage. No calipers needed.
How do I measure waist and neck?
Waist: around the navel, relaxed. Neck: below the larynx. Use a tape measure in inches or cm.
Can I use metric?
Yes. Enter measurements in cm or inches. The calculator accepts both.
Is this accurate?
It is an estimate. Accuracy varies with body shape. For precise body composition, use DXA or other methods.
Is this medical advice?
No. This tool is for informational use only. Consult a healthcare provider for health decisions.