Body Fat Calculator
Estimate your body fat percentage using the US Navy method. This calculator uses your gender, age, height, neck, waist, and hip measurements to provide an accurate body fat estimate along with your fitness category.
Body Fat
23.5%
Category
Average
Fat Mass
17.6 kg
Lean Mass
57.4 kg
Body Fat Categories (Men)
Essential Fat
2–5%
Athletes
6–13%
Fitness
14–17%
Average
18–24%
Obese
25–45%
How to Use
Select your gender and enter your height, neck circumference, and waist circumference in centimeters. Women also need to enter hip circumference. Measure your waist at the navel, neck at the narrowest point, and hips at the widest point. The calculator uses the US Navy body fat formula to estimate your body fat percentage and fitness category.
US Navy Method Formula
Men: BF% = 86.010 × log10(waist - neck) - 70.041 × log10(height) + 36.76
Women: BF% = 163.205 × log10(waist + hip - neck) - 97.684 × log10(height) - 78.387
Categories for men: Essential Fat (2-5%), Athletes (6-13%), Fitness (14-17%), Average (18-24%), Obese (25%+). For women: Essential Fat (10-13%), Athletes (14-20%), Fitness (21-24%), Average (25-31%), Obese (32%+). The US Navy method is considered reasonably accurate and correlates well with more expensive methods like DEXA scans.