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The Body Fat Calculator can be used to estimate your total body fat based on specific body measurements. Use the "Metric Units" tab if you are more comfortable with the International System of Units (SI). To get the best results, measure to the nearest 1/4 inch (0.5 cm). This calculation is based on the U.S. Navy method, but also includes the calculation of body fat percentage using the BMI method.
This tool applies the standard U.S. Navy Body Composition Algorithm:
Men (cm): % Body Fat = 495 / (1.0324 - 0.19077 × log10(waist - neck) + 0.15456 × log10(height)) - 450
Women (cm): % Body Fat = 495 / (1.29579 - 0.35004 × log10(waist + hip - neck) + 0.22100 × log10(height)) - 450
The U.S. Navy Method is accurate to within 3-4% for most individuals compared to DEXA scans when measurements are taken precisely.
Women naturally store a higher proportion of essential adipose tissue around the gluteal-femoral region, which requires hip circumference for accurate body density estimation.
Healthy ranges generally span 10–22% for adult males and 20–32% for adult females.
Body fat percentage measures the proportion of total fat mass relative to total body weight. Unlike Body Mass Index (BMI), which relies strictly on total height and weight, body fat estimation differentiates between muscle tissue, bone mass, and adipose tissue.
Tracking body fat percentage over time provides clearer feedback during fitness programs, ensuring weight loss comes primarily from fat stores rather than lean muscle tissue.