Navy Body Fat Calculator
Enter circumference measurements to estimate body fat percentage following the U.S. Navy Physical Readiness Program methodology.
Results
Body fat percentage
17.5%
Compliance
Within Navy body composition standards.
Converted measurements
Height 177.8 cm • Neck 40.6 cm • Abdomen 88.9 cm
How to Use This Calculator
Measure according to NAVMED P-117
For men, measure abdomen at navel level. For women, measure waist at the narrowest point and hip at the widest buttocks. Neck is measured just below the larynx.
Switch units as needed
Choose imperial (inches) or metric (centimeters); the calculator automatically converts data for logarithmic equations.
Compare against Navy standards
Verify your result with the latest Physical Readiness Program limits and consult your command fitness leader if above standards.
Formula
Male %BF = 86.010 × log₁₀(abdomen − neck) − 70.041 × log₁₀(height) + 36.76
Female %BF = 163.205 × log₁₀(waist + hip − neck) − 97.684 × log₁₀(height) − 78.387
- All measurements must be in inches before using the formulas.
- Equations align with the Navy Physical Readiness Program.
- Age-specific compliance tables determine pass/fail status.
Full Description
The Navy relies on circumference-based calculations when sailors exceed height/weight standards. Accurate tape measurements and adherence to official technique are essential for reliable estimates. This tool mirrors the standard formula to help sailors track progress between official assessments.
Always defer to a command fitness leader for official measurements. Body composition is only one part of the Physical Readiness Program, which also includes physical readiness tests and medical readiness requirements.
Frequently Asked Questions
What are the Navy body fat limits?
Limits vary by age and sex (e.g., males 18–21: 22%, females 18–21: 33%). Check the latest Physical Readiness Program references for exact values.
How accurate is this calculator?
It replicates the Navy formula, but real-world accuracy depends on measurement technique. Official assessments by trained CFLs prevail.
Do I measure abdomen or waist for men?
Men measure abdomen at the navel. Women measure waist at the narrowest point and hips at the widest buttocks.
Can I use this for Marine Corps or other branches?
This calculator is designed for Navy standards. Other branches use similar but distinct formulas and limits.