First decide how big you want your quilt.
I like them 60 X 72 inches
If you are using 4 1/2" cut squares, subtract off the 1/2" for seam allowances and use the number 4"
60" divided by 4" = 15 blocks across
72" divided by 4" = 18 blocks down
15 times 18 = 270 4"
48" X 60"
48" divided by 4" = 12 blocks
60" divided by 4" = 15 blocks
12 blocks times 15 blocks = 180 blocks
Use this formula to make your DBF's quilt the size that he would like.
I hope this helps you :D:D:D