Body Fat Percentage Calculator
Estimate how much of your weight is fat using only a tape measure. The US Navy method is a widely used, simple formula that is far more informative than BMI alone.
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How to use Body Fat Calculator
- 1Choose your sex and units.
- 2Enter your height and neck and waist measurements (plus hips for women).
- 3Read your estimated body fat percentage and category.
Features
- US Navy formula
- Metric and imperial
- Fat mass and lean mass
- Fitness category (ACE)
- Instant results
How to measure
Measure the neck just below the larynx, sloping slightly down to the front. Measure the waist at the navel for men, and at the narrowest point for women. Women also measure the hips at the widest point. Keep the tape level and snug, without compressing the skin.
Frequently asked questions
How accurate is it?
It is usually within 3–4% of lab methods such as DEXA, which is good enough to track changes over time.
What is a healthy body fat percentage?
Roughly 14–24% for men and 21–31% for women, according to the American Council on Exercise.
Why is weight optional?
Weight is only needed to show fat mass and lean mass in kg or lb.
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