US Navy Body Fat & Composition Calculator
Calculate body composition and body fat percentage using the official U.S. Navy circumference-based equations. Check your ACE fitness category in real-time.
📏 Biological Metrics
📊 Body Composition Results
About the US Navy Circumference Method
How is it Calculated?
The US Navy formula estimates body fat using mathematical models based on height and body circumferences. For men, the formula measures the neck and waist. For women, it measures the neck, waist, and hips. All measurements must be taken with a non-stretch tape measure.
Navy Equations (Metric)
Men:
BF% = 495 / (1.0324 - 0.19077 * log10(waist - neck) + 0.15456 * log10(height)) - 450
Women:
BF% = 495 / (1.29579 - 0.35004 * log10(waist + hip - neck) + 0.22100 * log10(height)) - 450
How to Take Accurate Measurements
Neck: Wrap just below the larynx, pulling slightly downward in front.
Waist: Measure horizontally around the navel for men, or at the natural narrowest waistline for women.
Hips: (Women only) Measure horizontally around the widest part of the glutes.