About the Body Fat Calculator
Estimate body fat percentage using the U.S. Navy circumference method — only a tape measure needed. Results include your category (essential/athlete/fit/average/obese) and lean mass estimate.
The Navy method correlates well with lab measurements when measurements are taken carefully, at zero cost.
How to use the Body Fat Calculator
- Choose sex and units, then enter height, neck and waist (women also hips).
- Read your estimated body fat % and category.
- Track changes monthly with consistent measuring technique.
Common uses
Fitness progress tracking beyond the scale
Setting body composition goals
Health screening context
Frequently asked questions
How accurate is the Navy method?
Typically within 3–4% of DEXA scans when measurements are taken correctly and consistently.
Where exactly do I measure?
Neck just below the larynx; waist at the navel (men) or narrowest point (women); hips at the widest point.
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