User blog comment:Repeater1947/Columnpoints/@comment-26531060-20120424050757

A zombie's columnpoint is the number of columns a zombie can walk before it dies by a 1 damage/1.4 second plant (for example, a Peashooter, Puff-shroom, Threepeater.e.t.c; check the Encyclopedia page for more information). Different zombies have different columnpoints.

To get a zombie columnpoint with the speed of a normal zombie, divide the health of the zombie by 4 and round it up. This is only an estimation.