Cool How Many Inches Does Hair Grow A Month References. Web how much can hair grow in a month according to experts, the hair on our scalp grows at an average rate of half an inch, which comes down to about four to six. This rate equates to about six inches per year.

On average, hair grows at a rate of about half an inch per month, or six inches per year. We’ll cut straight to it: However, this growth rate can vary from.