Hi, I would suggest that you look at the size of the fabric you use. The chart information states this is a pattern that is 10 inch round so if you are going to frame your finished pattern you need to add at least 2" to EACH side for final mounting and framing. I use 3" extra fabric each side. Anyway, if you add 4 inches to the height and 4 inches to the width, you would have fabric that is 14" by 14" and could use a 10 inch or 12 inch diameter hoop.
I am not an employee of ECS but one of the stitches that saw your question on their chat message board.
Hope this helps