Body Fat Percentage Calculator

The Science of Anthropometric Estimation (U.S. Navy Method)

The U.S. Navy body fat formula was developed by Dr. J.A. Hodgdon and P.R. Beckett in 1984 to provide a reliable, low-cost screening tool for military personnel. By combining height with neck, waist, and hip circumferences, the algorithm models body volume and density with a standard error of estimate of approximately 3% to 4% compared to dual-energy X-ray absorptiometry (DEXA) and hydrostatic weighing.

The South Asian “Thin-Fat” Phenotype

Extensive clinical studies highlight that people of South Asian descent frequently carry a “thin-fat” metabolic phenotype: standard or low BMI, accompanied by higher visceral adipose tissue and lower skeletal muscle mass. This is why scale weight alone is misleading for Indian adults — tracking body fat percentage and waist circumference provides a significantly more accurate picture of cardiovascular and metabolic fitness.

Body Recomposition: Gaining Muscle While Losing Fat

Rather than starving yourself on extreme low-calorie diets that shed water and hard-earned muscle, the true goal of modern training is body recomposition. By combining heavy progressive resistance training with a high-protein diet (1.6 to 2.0g per kg of lean mass) and a controlled 300–500 kcal deficit, you can decrease fat mass while preserving or even building active lean muscle tissue.