Generally, a soft ruler can be used to vertically measure the distance from the chin to the collarbone of the human body, which is the length of the neck. The length of a normal person’s neck is usually between 6 and 9 centimeters. If the length of the neck is less than 6 centimeters, it is a short neck, while a length of more than 9 centimeters is a long neck. However, the length of the neck also varies from person to person, thin and weak people’s necks appear relatively slender, slightly fat people’s necks appear relatively shorter. The length of the human neck is related to the height and size of the vertebrae, heredity, and acquired nutrition. For obese people, you can use neck stretching exercises and neck muscle massage to improve the tightness of the neck muscles, thus slightly improving the neck length. You can also change the style or method of dressing and wear necklaces to appear to have a long neck.