You can go to "cross stitch fabric" listed on the left. Then click on the calculator and put in the stitch numbers next to the picture of the pattern. After putting in the stitch count under it is the little arrow. Put in 11 count Aida, or whatever, fabric and you'll see the size you can use. Always allow about 4" on each side for framing, etc. Hope this helps you.

You can use whatever size fabric you like.

The finished size on 11 count would be about 31" x 18". You will need a lot more floss as well.