Uses the U.S. Navy circumference method — no calipers or scans needed, just a measuring tape.
Measure with a soft tape, snug but not compressing skin. Neck: below the larynx. Waist: at the navel. Hip (women only): at the widest point.
This estimate needs your body weight too — enter it below for fat/lean mass in kg. The Navy method has a margin of error of roughly ±3–4%, so treat it as a trend to track over time rather than an exact figure.
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