What Is a Body Fat Calculator?
A body fat calculator estimates the percentage of your total body weight that is composed of fat tissue. Using the U.S. Navy method, it applies a validated formula based on waist, neck, and height measurements to provide a body composition estimate without specialized lab equipment.
How to Use This Body Fat Calculator
- Enter your waist circumference (cm), neck circumference (cm), and height (cm).
- Click “Calculate” to view your estimated body fat percentage and corresponding fitness category (Essential Fat, Athletes, Fitness, Average, or Above Average).
Note: This tool uses the U.S. Navy male formula. Results are most accurate for men.
Key Concepts
Body fat percentage categorizes into essential fat (2–5% men, 10–13% women), athletes (6–13% men, 14–20% women), fitness (14–17% men, 21–24% women), and average (18–24% men, 25–31% women). Values above these ranges may indicate elevated health risks. Circumference-based estimates can vary by ±3–4% compared to DEXA scans.
Frequently Asked Questions
How accurate are circumference-based body fat estimates?
The U.S. Navy method has a typical error margin of ±3–4%. For higher precision, consider DEXA scans or hydrostatic weighing performed by healthcare professionals.
What is a healthy body fat percentage?
Healthy ranges are typically 10–20% for men and 18–28% for women, though optimal levels vary by age and fitness goals. Consult a healthcare provider for personalized assessment.
Can body fat percentage change without weight change?
Yes. Body recomposition—gaining muscle while losing fat—can keep total weight stable while improving body fat percentage and overall health markers.