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Body Fat Calculator

Estimate your body-fat percentage with a tape measure, using the U.S. Navy circumference method.

Your inputs

Gender

HeightcmCurrent weightkg

Circumference measurements

Waist cmNeck cm

The formula

U.S. Navy Circumference Method

Men
%BF = 86.01×log10(waist−neck) − 70.041×log10(height) + 36.76
Women
%BF = 163.205×log10(waist+hip−neck) − 97.684×log10(height) − 78.387

Kevin Hodgdon and Michael Beckett, Naval Health Research Center · 1984

Result

Estimated body fat

16.2%

Fit range

Lean mass estimate

62.8 kg

Useful for tracking trend direction over time.

The Navy method estimates body fat from height and circumference measurements.

Measure at the same time of day and keep tape placement consistent.

Results are estimates from published formulas, intended for healthy adults. They aren't medical advice, so check with a doctor or registered dietitian if you have a health condition.