Hair growth over a year refers to the average rate at which hair grows on the human scalp over a one-year period. While there is some natural variation among individuals and hair types, most people's hair will grow between 6 and 15 centimeters (2.5 to 6 inches) per year.
Hair growth is influenced by a number of factors including genetics, age, diet, and overall health. In general, hair grows faster in the summer months than in the winter months. And, as people age, their hair tends to grow more slowly. Eating a healthy diet and getting enough exercise can also help to promote healthy hair growth.
