Tisha, If you want to stitch on 14 ct, you would count as you would with other projects.
The below info is from the fabric calculator:
Fabric Size: 19" x 12" when stitched on 14ct Aida
We recommend at least 2 inches of extra fabric around the design for framing and finishing.A piece of 19"x12" fabric will give you 2.35" of extra fabric on the left and right, and 2.45" on the top and bottom.
Note:The stitched area will be 14.3" x 7.1".