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Body Fat Calculator
Estimate your body fat percentage using the U.S. Navy method. Enter waist, neck and height measurements, everything runs in your browser.
HOW TO USE
- 1Select your gender on the left (male or female).
- 2Choose your measurement unit on the left: inches or centimetres.
- 3Enter your waist, neck and height measurements on the left.
- 4Read your estimated body fat percentage and category on the right.
EXAMPLE
INPUT
Male · Waist: 36 in · Neck: 16 in · Height: 70 in
OUTPUT
Body fat: 12.9% — Athletes
FAQ
How accurate is the Navy method?
The Navy method is reasonably accurate for most people (within 3 to 4% of a DEXA scan). It works best for individuals with average body compositions.
What do the categories mean?
Essential fat is the minimum needed for health. Athletes and Fitness are lean ranges. Acceptable is a normal healthy range. Obese indicates excess body fat.
Where do I measure my waist?
For men, measure at the navel. For women, measure at the narrowest point of the torso, just above the hips.
Can I use centimetres?
Yes. Toggle between inches and centimetres — the tool handles the conversion internally.