Body Fat Calculator
Estimate your body fat using neck and waist measurements.
Calculate
Calculate
Measurements convert when you switch units
Result
—
The formula
The US Navy method estimates body fat from circumference measurements. It is more useful than BMI for fit individuals.
BF% = 86.010×log10(waist−neck) − 70.041×log10(height) + 36.76 (male)
Worked example
- Waist 85 cm, neck 38 cm, height 178 cm
- Apply Navy formula
- Result ≈ 18%
Result: 18% body fat
Interesting facts
Navy method
Developed by the US Navy for quick field assessments of personnel.
Frequently asked questions
Within 3–4% of DEXA scan for most people, but less accurate for very lean or obese individuals.