I know Mount Everest is 8850m (29000ft) high from sea level to its top. What I want to know is. What is the height of Mount Everest from its base (foothills) to its top, from where you start climbing untill you get to the summit. Only legit scientific answers please, no people trying to be funny or sarcastic. If there are any clever geologists on here please answer this question. As many answers as possible please, I have to know this for an assignment.