room for table
Ideally, you want 60 inches (5 ft) of free space on all sides of your table.
The easiest way to figure it is for a 4 1/2 x 9 you want your room to be 14.5 x 19 feet. 4 x 8 = 14 x 18 feet, etc.
These are the minimum guidelines I've always been taught anyway. Hope this helps.