The change in elevation from the base of Mount Kilimanjaro to the summit is approximately 4,873 meters (15,988 feet).

Here's a breakdown:

* Summit Elevation: Uhuru Peak, the highest point on Kilimanjaro, is at 5,885 meters (19,308 feet) above sea level.

* Base Elevation: The base of Kilimanjaro is generally considered to be around 1,012 meters (3,320 feet) above sea level.

Therefore, the difference in elevation is: 5,885 meters - 1,012 meters = 4,873 meters or 19,308 feet - 3,320 feet = 15,988 feet.