how many centimeters does hair grow a month
How Fast Does Hair Grow? Q: How fast does hair grow? A: The speed of hair growth is roughly 1.25 centimeters or 0.5 inches per month, being about 15 centimeters or 6 inches per year. With age the speed of hairgrowth might slow down to as little as 0.25 cm or 0.1 inch a month. Cell division is responsible for the hair growth cycle. The new cells push the hair forward to make it longer, so the new hair is added at the root. There are about 100.000 hairs on a healthy scalp of hair.