BMI is the body mass index, also called body mass index, BMI is the international commonly used to measure the degree of fatness and thinness of the human body and whether it is healthy a standard. The formula is BMI = weight (kg)/height2 (m2) in (kg/m2). The normal range is 18.5-24.9kg/m². For adults, a BMI between 18.5-24.9kg/m² is considered a healthy range, which means a moderate weight, neither too light nor too heavy. If the BMI is below 18.5kg/m2, it is considered underweight and may be at risk of malnutrition; while a BMI of over 25kg/m2 is considered overweight, and over 30kg/m2 is considered obese, which may increase the risk of heart disease, diabetes, and other chronic diseases. People with abnormal BMI can consult a medical professional for consultation and treatment.