Well, assuming your blocks are all cut square of the same fabric at 9.5 inches, and not pieced from different fabrics, out of one yard of fabric (42" x 36") you will only get 9 9.5 inch blocks. For 9 across and 7 down you will need 63 blocks, which means 7 yards of fabric just for the blocks. However, if you are piecing fabric to come up with your 9.5 inch block you would need to figure out each fabric separately. For the sashing you will need approximately 1,100 inches. At 1 1/5 inches wide per sashing strip you could conceivably get 24 strips out of a yard, which would give you 1008 inches. So for the sashing you should be absolutely safe with 1 1/4 yards of fabric. Good luck