Hair growth depends on many factors. Scientists have researched about hair growth rate and regarding how quickly does hair grow, you must know that on and average the growth rate is half an inch per month. That is abo 0.5 to 1.7 centimetres. There are many products and ways that you can apply if you are having slow hair growth.
While people from different region have different hair growth, the calculation is done with the average. Also you should know that male hair grows faster than female. The fifteen to thirty years is the time when our hair grows most quickly.