Most of the room size charts tend to underestimate the amount of room you need to play comfortably and effectively. Below is our recommendation:

(1) You must allow for the length of the cue stick AND an extra 6 inches (at least) for a comfortable stroke.
(2) Add this number to the width and length of your tables' playing area.

The tables' playing area is measured from from the inside edge of the cushion to the opposite inside edge of the cushion. An illustration of what a "playing height" and "playing width" is shown above.