Body Fat Calculator
Estimate your body fat percentage using the US Navy circumference method.
US Navy method. For educational purposes only.
Body fat percentage
17.4%
FitnessHow to use
- Select your sex and unit system.
- Measure and enter neck and waist circumference at the narrowest points.
- For women, also enter hip circumference at the widest point.
- See your estimated body fat percentage and category.
US Navy method
Uses height, neck, waist (and hip for women) circumferences.
Measurements should be taken with a flexible tape measure, level and snug but not compressing skin.
Example
A man 175 cm tall with 38 cm neck and 85 cm waist:
Estimated body fat ≈ 15–18%, typically in the fitness range.
Frequently asked questions
How accurate is the US Navy body fat formula?
It is a widely used field estimate, typically within 3–4% of DEXA scan results for most adults when measurements are taken correctly.
Where do I measure neck and waist?
Neck: just below the larynx. Waist: at the navel level. Hip (women): at the widest part of the hips.
What is a healthy body fat percentage?
For men, 10–20% is generally considered healthy. For women, 18–28% is typical. Athletes often have lower percentages.
Is body fat better than BMI?
Body fat percentage directly estimates fat mass, while BMI is a weight-to-height ratio that does not distinguish muscle from fat.
Can I use this for military fitness standards?
This tool provides an estimate. Official military body composition uses specific measurement protocols and may differ slightly.
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