If you stitch OVER 2 squares on the 28 count your completed design would be the same size as if you stitched OVER 1 square on 14 count aida fabric.

The finished size of the completed pattern would be: 7 1/2 inches wide x 7 1/2 inches tall.

By adding 3 inches each side of fabric for framing and mounting, you would need a 14 inch wide x 14 inch tall piece of fabric.