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Measure it.
That's going to depend on how big a circle the round base is. The bigger the base is, the shorter the cylinder is. Whatever the diameter of the base is, the height of the cylinder will be (3.82) divided by (the square of the diameter of the base).
Volume = Pir2 X height Diameter = 2r Pi = 3.1416 Solve for diameter Volume/height = 3.1416(diameter/2)2 (square root of (Volume/height/3.1416)) X 2 = diameter of the cylinder base
It would not be recommended that you wear 8.7 base curve and 14.0 diameter soft disposable contacts if that is not your prescription. Your eye doctor should order the correct size of 8.6 base curve and 14.2 diameter when he orders your new soft disposable contacts.
Measure the outside diameter and subtract tooth height times two.