Human body proportions are unique and there are variations across the races. But according to one study, arm span exceeds height by 5.3 cm (2.1 in) in the average adult man and by 1.2 cm (0.5 in) in the average adult woman,
Thus, if you're an adult man with a 77 inches wingspan, you should be standing at about 75 inches (190.5 cm). The average adult woman with this reach, should be about 76.5 inches tall (194.3 cm).
The human body itself is believed to be symmetrical as displayed in Leonardo DaVinci's Vitruvian Man in which a man with outstretched arms fits exactly into a square.
It was previously believed that the wingspan of a person is equal to the height of that same person. See this experiment which aims to verify the proportionality of the human body.
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