The average human scalp has anywhere from 120,000 to 180,000 hairs.The average hair grows at a rate of about 1/2 inch per month.The average person's hair grows 6 inches per year.Hair has an average growth cycle of 4-6 years.Most people can grow their hair between 24 and 36 inches.Some people have a very short hair growth cycle, only 1 & 1/2 years, this means their hair will grow to a maximum length of nine inches.Ten years seems to be the maximum growth cycle. This accounts for people with extremely long hair (ex: Crystal Gayle), reaching 60 inches.
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Hair Growth Cycle