Body Fat Calculator
US Navy circumference method
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body fat %
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ACE category
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Fat mass
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Lean mass
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BMI (for reference)
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FFMI (muscle leanness)
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Direction
Navy vs Dexa — expect ±3%
The Navy circumference method has ±3-4% standard error vs Dexa gold standard. It's free, repeatable, and good for TREND tracking. For absolute numbers, get a Dexa scan or BodPod test.
Related tools
ACE Body-Fat Categories
- Essential: Men 2-5%, Women 10-13%
- Athletes: Men 6-13%, Women 14-20%
- Fitness: Men 14-17%, Women 21-24%
- Average: Men 18-24%, Women 25-31%
- Obese: Men 25%+, Women 32%+
Measure right: neck below the larynx, waist at the navel when relaxed (not sucked in), hip at the widest point of the buttocks. Measuring wrong by even 2cm shifts the answer ~1.5%.