in
in
Measure just below the larynx
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Measure at navel level
Category—
Fat mass—
Lean mass—
Body fat %—
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Body fat % categories
| Category | Women | Men |
|---|---|---|
| Essential fat | 10–13% | 2–5% |
| Athletes | 14–20% | 6–13% |
| Fitness | 21–24% | 14–17% |
| Average | 25–31% | 18–24% |
| Obese | 32%+ | 25%+ |
About the US Navy method
This calculator uses the US Navy circumference method, developed by the US Navy for fitness assessments. It estimates body fat percentage using simple tape measurements rather than expensive equipment like calipers or DEXA scans.
While not as precise as clinical methods, it's accurate to within about 3-4% for most people and is one of the most accessible ways to track body composition changes over time.
Frequently asked questions
Why does BMI vs body fat % differ?
BMI only considers height and weight, so it can't distinguish muscle from fat. A muscular athlete might have a "high" BMI but very low body fat. Body fat percentage gives a more accurate picture of body composition.
How accurate is the tape measure method?
The Navy method is typically accurate within 3-4% of more expensive methods like DEXA scans, making it a great free alternative for tracking trends over time.
What's a healthy body fat percentage?
For general health, 14-24% for men and 21-31% for women is considered acceptable, with "fitness" and "athletic" ranges being lower. Going below essential fat levels can be dangerous.