Body Fat (Navy)

Estimate body-fat percentage with the US Navy circumference method, which uses waist, neck and height (plus hip for women) instead of calipers. It's a tape-measure estimate, so treat it as a trend indicator rather than a lab number. Informational only, not medical advice.

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Worked example

Body fat: 20.146657%

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Inputs

Sex
Male / Female
Waist cm
90
Neck cm
38
Height cm
178
Hip cm (F)
95

Frequently asked

Why does the female formula need a hip measurement?

The Navy equations differ by sex; the female version adds hip circumference to improve accuracy for typical fat distribution.

How accurate is the Navy method?

It's usually within a few percentage points of more expensive methods when you measure carefully, but consistency of measurement matters most.