체지방률 계산기

This calculator implements the US Navy Body Fat Estimation Method, a circumference-based formula validated against hydrostatic weighing in multiple studies. For males: Body Fat % = 86.010 × log10(waist - neck) - 70.041 × log10(height) + 36.76. For females: Body Fat % = 163.205 × log10(waist + hip - neck) - 97.684 × log10(height) - 78.387. All measurements use circumference in centimeters and height in centimeters. The formula requires waist circumference (measured at the navel), neck circumference (measured at the narrowest point), and hip circumference (women only, measured at the widest point). Body fat categories follow the American Council on Exercise (ACE) guidelines: Essential Fat (2-5% male, 10-13% female), Athletes (6-13% male, 14-20% female), Fitness (14-17% male, 21-24% female), Average (18-24% male, 25-31% female), Obese (25%+ male, 32%+ female). Data sources: Hodgdon & Beckett, Naval Health Research Center (1984). Validation studies show accuracy of ±3-4% compared to hydrostatic weighing. Limitations: Circumference-based methods are less accurate than DEXA scanning or hydrostatic weighing. Accuracy may be lower for very lean individuals, the obese, or those with atypical body proportions. Measurement technique significantly affects results — inconsistent measurement locations can introduce 2-3% error.