The average rate of hair growth per year varies from person to person and depends on various factors, including age, genetics, health, and diet. However, the average rate of hair growth is generally considered to be around 6 inches (15 cm) per year, or approximately half an inch (1.25 cm) per month.
It is important to note that hair growth is not constant, and it can vary throughout the year. For example, hair may grow faster during the summer months and slower during the winter months. Hair growth can also be affected by hormonal changes, such as during pregnancy or menopause, or by certain medical conditions or medications.
While there is no guaranteed way to accelerate hair growth, maintaining a healthy diet and lifestyle can help to promote healthy hair growth. Eating a balanced diet rich in vitamins and minerals, staying hydrated, and reducing stress can all contribute to healthy hair growth. Additionally, using gentle hair care products, avoiding harsh chemical treatments, and minimizing heat styling can help to prevent damage and breakage, which can slow down hair growth.