Body Fat Calculator
Estimate your body fat percentage from measurements.
Free · No sign-up · Works in your browser
Uses the U.S. Navy circumference method — an estimate, not a clinical measurement like a DEXA scan. Measure the neck below the larynx, the waist at the navel, and (for women) the hip at the widest point.
About the Body Fat Calculator
Estimate your body fat percentage free using the U.S. Navy method — no calipers or scale needed, just a tape measure. Enter your height, neck, and waist (plus hip for women) in metric or imperial units, and get your estimated body fat percentage along with the category it falls into (essential, athletic, fitness, average). It's a quick, repeatable way to track changes over time — more meaningful than weight alone, since it separates fat from muscle.
How to use the Body Fat Calculator
- 1Choose your sex and metric or imperial units.
- 2Measure and enter your height, neck, and waist (and hip for women).
- 3Read your estimated body fat percentage and category.
Frequently asked questions
How accurate is the Navy method?
It's a solid estimate — typically within a few percent of a DEXA scan — and very consistent for tracking changes, as long as you measure the same way each time.
Where exactly do I measure?
Neck just below the larynx, waist at the navel (relaxed), and, for women, the hip at its widest point. Keep the tape snug and level.
What's a healthy body fat percentage?
Roughly 14–24% for men and 21–31% for women is considered the healthy range, though athletes are often lower. Essential fat is ~2–5% (men) and ~10–13% (women).