User blog comment:The Bonehead Skipper/Unanswered Questions for the New World/@comment-4783583-20120205030812

whitebeard height is guessable my guess is that he is about 721 cm/770 cm, an average human is about 170 cm , Rockstar was a rather tall man probably  around 198 cm , he reached to half way of whitebeard's knee cap. Meaning whitebeards lower leg is at least 200 cm his upper leg was far longer then his lower  leg, so lets say it was 300 cm. then  once legs are always longer then once torso, average is 20 cm  but, average doesn't go for whitebeard. So my guess his torso with head is about 200 to 300 cm. The scaling in the anime and manga might not always be correct so my ultimate guess  is that he is 721 cm.