To determine the size of your cloth you need to know:

Once you have these dimensions, to determine the cloth size,
add the drop X 2 to each dimension of your table. 

Example:      Table size is 30"x72"; desired drop is 12"

                    12" (drop size) X 2=24" 

                    Add 30" + 24"= 54"

                    Add 72" + 24"= 96"

                    CLOTH SIZE= 54" X 96"

A few things to remember, if a square or rectangular (also called oblong) cloth has a drop to the floor, you will need to order with rounded corners, otherwise, the corners will drag on the floor.

When ordering an oval, our standard oval is shaped like a 
racetrack.  If your oval is more "egg-shaped" and you need 
the drop to be exact, you would need to send a template 
of the tabletop for us to use as a pattern.

Round tables are measured by their diameter.  
Some standard sizes include 60" rounds, 72" rounds