The standard formula for calculating human body weight needs to be judged according to the specific gender, male standard weight (kg) = [height (cm) – 80] × 0.7, female standard weight (kg) = [height (cm) – 70] × 0.6. For example, the standard weight of a male of 1.75 meters tall is 66.5kg, while the standard weight of a female of 1.75 meters tall is 63kg, and there is a ± 10% fluctuation in weight is normal. 10% fluctuation in weight is also normal. But the standard weight can not represent the body quality of the human body, through the standard weight to determine whether the body is too thin or obese, then the body mass index that is BMI as the main basis for judging whether the weight of the standard, the WTO standard adult BMI calculation formula is BMI = weight (kg) / height (m) ^ 2, the standard range of adult BMI in China is 18.5-23.9. Another common formula In addition, the standard weight (kg) = height (cm) – 105, in ± 10% range are standard weight.