He was 6'1.5" in his heyday [depending on the time of day, and a little taller in the morning, most likely], and is shorter today - probably 6'0.5" or 6'0, considering he is 70. I would be surprised if he was under 6'0 bare feet today, despite his age.
Also, just look at him walking around in videos - look at the length of his arms; they look long. Stuff like that will clue a person into someone's height even if they are not perfect techniques to use. He was in a photo with Gunter, and they both looked to be the same height. When he was giving Gunter his award at the 2003 Olympia, they both looked the same height too, only it was then that I realized Gunter was barefoot and Arnold had dress shoes on. So I got confused again, but there is always the matter of angles to deal with.
Final answer = 6'1.5 in his prime, and today he may have lost up to [but likely no more than] 1.5".
PS - I am Getbig's resident height expert, so everyone close this thread now.
