Calculadora de Percentual de Gordura Corporal (U.S. Navy)

The Body Fat Percentage Calculator (U.S. Navy) estimates the percentage of body fat using simple anthropometric measurements: height, neck circumference, waist circumference, and for women, hip circumference. It is based on the formula developed by the U.S. Navy, which correlates these measurements with body density. The result is a useful estimate for assessing body composition, but it does not replace more accurate methods like hydrodensitometry or DEXA.

The calculation uses specific logarithmic equations for each sex. For men: %Fat = 86.010 * log10(waist - neck) - 70.041 * log10(height) + 36.76. For women: %Fat = 163.205 * log10(waist + hip - neck) - 97.684 * log10(height) - 78.387. Measurements should be taken with a flexible tape measure, at the navel level for waist, the narrowest part of the neck, and the widest part of the hips (for women). Height in centimeters.

This calculator is useful for people who want to monitor changes in body composition over time, such as athletes, fitness enthusiasts, or individuals in weight loss programs. It is also used in military and occupational health contexts for physical fitness screening. However, it is not suitable for children, pregnant women, or people with morbid obesity, as the formula was validated for adults with mild to moderate overweight.

Important precautions: accuracy depends on proper measurement technique. The tape should be snug but not compress the skin. Measuring on an empty stomach and after emptying the bladder can reduce variations. The formula may overestimate fat in very muscular athletes and underestimate in older adults. For best results, repeat measurements three times and use the average. Consult a healthcare professional for proper interpretation.