BMI is calculated as weight (Kg)/height (m)². BMI, also known as Body Mass Index, is an internationally used indicator of obesity. the formula for calculating BMI is Weight ÷ Height ², where the unit of weight is kg and the unit of height is m. The normal range of BMI is 18.5~23.9, 24~27.9 is overweight, and BMI over 28 is considered overweight. The normal range of BMI is 18.5~23.9, 24~27.9 is overweight, and BMI greater than 28 is obesity; high BMI will increase the risk of hypertension, diabetes, and cardiovascular and cerebral vascular diseases, while low BMI will cause malnutrition and increase the risk of osteoporosis and other diseases. It is recommended to make positive adjustments when abnormal BMI occurs, and if necessary, you can go to the hospital and ask the doctor to make judgments and treatments.