The standard formulas for height and weight are BMI and Standard Weight Method. BMI is the body mass index, the formula is BMI = weight (kg) / height ² (m ²).BMI index is mainly to reflect the relationship between height and weight. The normal value of BMI in China is between 18.5~23.9, if BMI＜18.5 is lean, BMI≥24 is overweight, BMI≥28 is obese. The formula of standard weight method is: standard weight = height – 105, or standard weight = (height – 100) * 0.9. If the weight is more than 10% of the standard weight, it is overweight, and more than 20% of the standard weight, it is obese. Both methods can determine whether the weight is normal or not. The general public usually uses BMI, while professionals need to use standard weight when calculating energy. Height and weight are also affected by a variety of factors such as gender, age, and genetics. It is recommended that obese and overweight people can go to the nutrition department of the hospital to develop a reasonable weight reduction program.