Health tool
Body Fat Calculator
Estimate body fat with circumference measurements and translate the percentage into estimated fat mass and lean mass.
Body measurements
Estimated body fat
18.0%
U.S. Navy circumference estimate · Average
Fat mass
32.4 lb
Lean mass
147.6 lb
Measure at the same time of day with a level tape. This method is useful for tracking trends, but it is not a clinical body-composition scan.
How to measure consistently
Use a flexible tape held level and snug without compressing the skin. Measure the neck below the larynx, the waist at the navel for men, and the natural waist plus widest hip circumference for women.
The Navy formula is an accessible screening estimate. Hydration, tape position, body shape, and measurement technique affect the result. For trend tracking, repeat measurements under similar conditions rather than focusing on a single reading.
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