Arm length and height still have a certain correlation, when standing normally with the upper limbs stretched out to both sides, the distance between the 2 fingertips is generally called arm span, arm span and height is a 1:1 relationship. If the height is 180cm, the length of the arm span is also in about 180cm, there will not be much difference, so the arm length and height still have a certain correlation. But because of the human race, that is, the human genetic genetic factors, development factors, life environment factors, etc., will also affect the relationship between arm span and height. Some people just have longer arms, if their height is 180cm, arm span can even reach 190cm when long, some people also appear to have a much smaller arm span than their height. But generally speaking, the majority of people arm length and height or a certain correlation, that is, arm span and height is generally 1:1 ratio.