They are typically between 50 to 70cm long. Hence the taller you are the taller your axe should be. However you don’t want it too long as it may become difficult to use. It is a fine balance to find. For someone who is below 5’8 feet, a 50 to 60 cm axe is offered. If you are between 5’8 and 6’0 then a 60 to 70cm axe is suggested. Finally if you are over 6’0 then a 60 to possibly 75cm length axe is recommended.