Hi Janet,
Nice pattern! Stitch size is 340 wide x 260 high. On 14 count and with adding 3 inches Each side for framing, you would need fabric that is 30 inches x 25 inches.
On 16 count fabric (again with 3 inches Each side for framing) you would need fabric 27 inches x 22 inches.
Both these aida measurements is going Over ONE square with 2 stands of floss.
Hope this helps!