Body Fat Percentage Calculator (US Navy Tape Method)
Fitness
The US Navy Body Fat formula is the official military standard used to measure physical readiness with high statistical accuracy compared to DEXA scans.
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How it works
Choose biological sex and select US Imperial (inches/lbs) or Metric (cm/kg).
Enter your height, weight, and tape measurements for neck, waist (and hips for women).
Instantly view your body fat percentage, lean muscle mass, and fitness classification.
Frequently asked questions
How accurate is the US Navy body fat method?
The US Navy tape method correlates within 1% to 3% of dual-energy X-ray absorptiometry (DEXA) scans when measurements are taken accurately.
Where exactly should I measure my waist and neck?
Measure the neck at its narrowest point right below the larynx (Adam's apple). For men, measure the waist horizontally at navel level. For women, measure at the narrowest natural waistline.
Is this tool free?
Yes. The site is supported by ads, so you never pay or need to create an account.
Does it work on mobile?
Yes. The page adapts to your screen and does not require installing any app.