Country Metric Imperial Name Note Lifespan (Age at death) United States 272 cm 8 ft 11.1 in Robert Wadlow Tallest human in recorded history confirmed by Guinness World Records.[1] 1918–1940 (22) United States 267 cm 8 ft 9 in John Rogan Second tallest male in recorded history. Weighed only 92.5 kg (204 lb). Unable to stand due to ankylosis.