Human hair growth a new strand of hair begins to form. The rate or speed of hair growth is about 1.25 centimetres or 0.5 inches per month, or about 15 centimetres or 6 inches per year. The anagen phase is known as the growth phase. This is the phase where the hair physically grows approximately 1 cm per month. It begins in the papilla and can last from two to six years. The span at which the hair remains in this stage of growth is determined by genetics. The longer the hair stays in the anagen phase, the longer it will grow. During
Long hair lower values in average. In cosmetology, hair lengths are usually categorized according to the part of the body where the bulk of the longest hair terminates: "chin level", "shoulder length", "lower shoulderblade"/"mid-back level", "waist length", "hip-length", "classic length" (extends to almost "buttock-length", i.e. upper thigh-length, where the legs meet the buttocks), "thigh-length", "knee-length" and "ankle/floor length" hair. Hair usually takes about two years to reach shoulder length, and about seven years to reach waist-length/hip-length, including occasional trims (approximately 80–90 cm (32–36 inches) from forehead for most people) The maximum hair length that is possible to reach is about 15 cm