neighboring peaks Lhotse , 8,516 m (27,940 ft); Nuptse , 7,855 m (25,771 ft); and Changtse , 7,580 m (24,870 ft). In 1856, the Great Trigonometric Survey of British India established the first published height of Everest, then known as Peak XV , at 29,002 ft (8,840 m). In 1865, Everest was given its official English name