How body fat is estimated
The US Navy method estimates body fat from your height and circumference measurements. Men use neck and waist; women also use the hip. It applies a logarithmic formula validated against the US Navy standard. It is an estimate, not a substitute for a DEXA scan.
How to use it
Measure your neck, waist (and hip for women) with a tape measure, keeping it snug and level. Enter your height and measurements and your estimated body fat percentage and category appear instantly.
Frequently asked questions
- How accurate is the US Navy method?
- It is typically within about 3–4% of more advanced methods when measurements are taken carefully.
- Where do I measure my waist?
- Men measure at the navel; women at the narrowest point. Keep the tape level and do not pull it tight.
- What is a healthy body fat percentage?
- Roughly 10–20% for men and 18–28% for women is considered healthy, varying with age and fitness.
- Why is body fat better than BMI?
- Body fat percentage reflects composition directly, so it is more meaningful than BMI for athletic or muscular people.