The standard weight for a boy of 170 should be around 65kg, and the standard weight is an important indicator of a person’s state of health. Too fat or too thin will affect the health of the body. The standard weight for boys is generally calculated as height minus 105, which is the standard kilograms, if more than 20% of the standard number for obesity, if less than 20% of the standard number for thin, but for the higher muscle content of the people, this formula is inaccurate, because the more muscle, less fat content, the weight will be heavier than the average person. If you are too thin, you may lose your resistance, which is not good for your health, and you need to gain weight; if you are too fat, your liver, heart and lung functions may be affected. Therefore, maintaining a standard weight is very favorable to health.