The American Academy of Dermatology says that hair grows about 1/2 inch per month on average. Thats a grand total of about 6 inches per year for the hair on your head. How fast your hair grows will depend on your: age.
What is the speed of hair growth per day?
Ignoring these perceptual differences, human hair grows at a fairly consistent rate of about half a millimeter per day, or about half an inch each month (more specifically, the study says hair grows at 0.44 mm per day). Depending on your age, hair may grow faster or slower.
Can hair grow any faster?
In general, mens hair grows faster than womens, but pregnancy can actually speed up the hair-growth process. Even the time of year can affect how fast or slow hair grows. “Hair tends to grow a little faster in summer and slower in winter,” said Dr.