From the Guinness Book of World Records:
The tallest man in medical history was Robert Wadlow (USA). When measured in June 1940, shortly before his death, he was 8ft. 11.1 in. (2.72 m.) tall. His greatest recorded weight was 491 lb.(222.71 kg) on his 21st birthday. He weighed 438 lb. (199 kg) at the time of his death.
His shoe size was 37AA (18.5 in. or 47 cm long) and his hands measured 12.75 in. (32.4 cm) from the wrist to the tip ofthe middle finger. His arm span was 9 ft. 5.75 in. (2.88 m) and his peak daily foodconsumption was 8,000 calories.
At the age of nine, he was able to carry his father, Harold F. Wadlow, who stood 5 ft. 11 in. (1.8 m) and weighed 170 lb. (77 kg), up the stairs of the family home.
