Body Fat Calculator
Calculate your body fat percentage using the US Navy method. Enter neck, waist, and hip measurements for accurate results.
Measurements
Enter your weight and height
| Category | Male (%) | Female (%) |
|---|---|---|
| Essential Fat | 2 – 5 | 10 – 13 |
| Athletes | 6 – 13 | 14 – 20 |
| Fitness | 14 – 17 | 21 – 24 |
| Average | 18 – 24 | 25 – 31 |
| Above Average | 25 – 31 | 32 – 39 |
| Obese | ≥ 32 | ≥ 40 |
How It Works
- Select your sex (male or female).
- Enter your height, waist circumference, and neck circumference.
- Women: also enter your hip circumference.
- The calculator applies the U.S. Navy body fat formula.
- Your body fat percentage and fitness category are displayed instantly.
Formula
Men: %BF = 86.010 x log10(waist - neck) - 70.041 x log10(height) + 36.76
Women: %BF = 163.205 x log10(waist + hip - neck) - 97.684 x log10(height) - 78.387
(all measurements in cm)Example
Input: Male | Height: 180 cm | Waist: 90 cm | Neck: 38 cm
Result: Body fat: 26.4%
Category: Average
FAQ
It uses the U.S. Navy method, which estimates body fat from waist, neck (and hip for women), and height measurements.
The Navy method has an error margin of about +/-3-4 percentage points. DEXA scans are more accurate but require clinical equipment.
No. All calculations run entirely in your browser. No measurements are ever sent to a server.
For men, 14-17% is fitness level; for women, 21-24%. Athletes typically have lower values.