First, a measurement site:

On the arm - right arm into the acromion to the radial head connection point, that is, triceps muscle belly bit. Back - right below the scapular angle. Abdomen - right side abdominal umbilical 1cm. In addition to these sites, the research needs can be measured according to the neck, chest, waist, thighs and calves before and after the lateral gastrocnemius site. It should be noted: The sebum meter measured the thickness of subcutaneous fat, skin and subcutaneous adipose tissue and double.

Second, the formula

1, according to the thickness of subcutaneous fat, body density projection method, and we have no reference to Japan targeting young people from the formula for calculating the body density of user information, the formula is:

Men 15-18 body density = 1.0977-0.00146X 19 years old body density = 1.0913-0.00116X

Women :15-18 years old body density = 1.0931-0.00160X 19 years old body density = 1.0897-0.00133X

X = scapular angle of sebum under the + upper arm (mm)

2, the calculation of body fat%

Application Broxek (1963) modified the formula to calculate body fat%, it was considered Broxek improved body fat% is calculated

A more reliable method of calculating the formula is:

Body fat% = (4.57 / Body Density -4.142) X100 body fat weight = weight (kg) X body fat%

Net weight (fat free body weight) = weight (kg) - body fat mass (kg)