List Of How Long Hair Grows A Month References. On average, hair grows about half an inch per month. How to speed up hair growth when to.

You have more than 90 to 95% hair follicles on your scalp in the growth phase. The scalp hair grows at about 1/3 to 1/2 inch per month on average, so about four to six inches per year for the hair on. On average, hair grows at a rate of about half an inch per month, or six inches per year.