Navy-seal formula which only requires simple variables such as age, gender, height, body weight and circumferences of waist, hip and neck. Calculation of body for males is by using the formula of 86.010 x log10 (abdomen - neck) - 70.041 x log10 (height) + 36.76 while for females it is 163.205 x log10 (waist + hip - neck) - 97.684 x log10 (height) - 78.387 [10].