Align edge loops with different scale What would be the quickest way to align multiple edge loops that are scaled differently to one that is scaled correctly?

Let's say I want to shape all the edge loops of the first example like the top one, so that they form a cylinder.
That can be done very quickly with Loop Tools addon that can be found and enabled in the user preferences.

In edit mode select top and bottom loops and in tools panel look for Loop Tools section, select Curve and all the intermediary loops will be aligned automatically.