It's relatively well known that Everest is the highest mountain above sea level, and that Mauna Kea in Hawaii is the tallest mountain from base to top.
But how tall is Everest from base to top? Or to put it another way, how high is Everest's base?
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The height of Everest above its base depends on where one considers its base to be - and this depends on which side of the mountain one looks.
According to Wikipedia,
reasonable base elevations for Everest range from 4,200 m (13,800 ft) on the south side to 5,200 m (17,100 ft) on the Tibetan Plateau, yielding a height above base in the range of 3,650 to 4,650 m (11,980 to 15,260 ft).