Well most of us have already use them so here is a chart I found that I hope you can print and use.
One Fat Quarter will give you
99 - 2" squares 16 - 4-1/2"squares
50 - 2-1/2" squares 12 - 5" squares
42 - 3" squares 12 - 5-1/2" squares
30 - 3-1/2" squares 9 - 6" squares
20 - 4" squares 6 - 6-1/2" sqaures