A normal adult with a height of 185cm has a normal weight range of about 72 to 88 kilograms. Normal weight can be calculated according to height, and the reference formula is: ideal weight (kg) = height (cm) – 105 (or 110). Normal weight should be a range of values, we call this range of values, generally within the range of standard weight ± 10%. Above this range, it can be called abnormal weight. In addition to ideal weight, the standard weight range of normal adults can also be assessed based on body mass index and waist circumference, etc. Body Mass Index (BMI), which is calculated as follows: BMI (kg/m2) = body weight (kg) / [height (m)]2, with a normal BMI range of 20 to 23.9. The normal BMI range is 20~23.9. If the weight fluctuates significantly within a short period of time, excluding changes caused by diet, exercise and other lifestyle changes, and when combined with other symptoms, the patient should consult the doctor in time.