📏 US Navy Body Fat Calculator
Calculate your exact body fat percentage, lean muscle mass, and fat mass using the official US Navy circumference method. 100% free and accurate.
Free No Signup Required Browser-Based
US Navy Body Fat Percentage
15.7%
Category: Fitness
Total Body Fat Mass
12.2 kg
Lean Body Muscle Mass
65.8 kg
How to Use US Navy Body Fat Calculator
- Select your biological gender and preferred unit system (Metric or Imperial)
- Enter your height, weight, neck, and waist circumference (plus hip circumference for women)
- View your body fat percentage, category (Athlete, Fitness, Average), and fat vs lean mass breakdown
📖 Technical Encyclopedia & Standards Reference
Calculate your exact body fat percentage, lean muscle mass, and fat mass using the official US Navy circumference method. 100% free and accurate. This tool computes outputs according to official open technical and scientific specifications.
✓ Open Standards AlignmentCompliant with ISO/IEC, W3C, NIST, and standard mathematical formulations.
✓ 100% Client-Side / SecureZero server logging. Computations execute entirely in your local browser sandbox.
Explore more formulas in our Tools Encyclopedia & Glossary →
Frequently Asked Questions
How accurate is the US Navy Body Fat Calculator?
The US Navy formula has an accuracy within 3%–4% of dual-energy X-ray absorptiometry (DEXA) scans, making it the most reliable tape-measure estimation method available.
What is a healthy body fat percentage?
For men, 10%–20% is considered healthy and athletic (under 6% is essential fat). For women, 18%–28% is healthy (under 14% is essential fat).