Body Fat Calculator
Calculate your body fat percentage using the U.S. Navy Method. Enter your measurements to get instant results with body composition breakdown.
Measurements
Results
Enter your measurements and click Calculate to see your body fat analysis.
About This Method
Body Fat Calculator
Calculate your body fat percentage using the U.S. Navy Method. Enter your measurements to get instant results with body composition breakdown.
Features
- U.S. Navy Method body fat percentage calculation
- Supports both metric (cm/kg) and imperial (in/lbs) units
- Detailed body composition breakdown with fat mass and lean mass
- Visual body fat category indicator (Essential, Athlete, Fitness, Average, Obese)
- Separate calculations for male and female body types
- 100% private — all processing happens in your browser
How to use
- Select your gender (male or female) and preferred unit system.
- Enter your height, weight, neck circumference, and waist circumference.
- For women, also enter your hip circumference.
- View your body fat percentage, fat mass, lean mass, and body fat category instantly.
Tips & Best Practices
- Take measurements in the morning before eating for the most consistent results.
- Use a flexible measuring tape and keep it snug but not tight against the skin.
- Measure multiple times and use the average for best accuracy.
- Track your body fat percentage over time to monitor progress.
- All calculations are performed locally in your browser — no data is sent to servers.
FAQ
What is the U.S. Navy Method?
The U.S. Navy Method is a body fat estimation formula developed by the U.S. Navy. It uses circumference measurements of the neck, waist, and hips (for women) along with height to calculate body fat percentage. It is considered reasonably accurate for most people.
How accurate is this calculator?
The U.S. Navy Method is generally accurate within 3-4% of more precise methods like DEXA scans. It works best for people with average body compositions and may be less accurate for very lean or very overweight individuals.
What are healthy body fat ranges?
For men: Essential fat is 2-5%, Athlete 6-13%, Fitness 14-17%, Average 18-24%, and Obese 25%+. For women: Essential fat is 10-13%, Athlete 14-20%, Fitness 21-24%, Average 25-31%, and Obese 32%+.
Is my data private?
Yes, all calculations happen entirely in your browser. No measurements or personal data are ever sent to any server or third party.
How should I take the measurements?
Use a flexible tape measure. Neck: measure at the narrowest point below the Adam's apple. Waist: measure at the navel level. Hips: measure at the widest point. Keep the tape snug but not compressing the skin.