The U.S. Navy Body Fat Calculator uses simple tape measurements — neck, waist, and hips — to estimate your body composition without expensive equipment. Developed by the United States Navy, this clinically validated formula calculates the ratio of fat mass to lean muscle mass, giving you a clear picture of your fitness level. Unlike BMI, it accounts for body shape, making it one of the most practical and accessible tools for tracking your health journey. Enter your measurements below to instantly discover your body fat percentage and what it means for your overall well-being.
This calculator uses the U.S. Navy circumference method and provides an estimate. Results may vary ±3–4%. Consult a healthcare professional for clinical body composition assessment.