Originally Posted by irishrose
Your squares finish at 6 inches. You need 15 across and 16 down to make a quilt 90 x96 before borders. Multiply 15x16=240. 120 solid is 3.33 yards, but you need buy a little more for cutting and some for the setting triangles, so at least 4 1/2 yards. 120x9=1080 printed squares, so you'll need another jelly roll or some coordinating fabric you can cut into 2 1/2" squares. Then you'll need some fabric for your borders.
Your math is off as these blocks are on point (if the OP is doing it the same way as the picture she provided).
You would need 12 down and 11 across - so 132 9Patch blocks.
This quilt is 102x110 including a 4" border. Blocks finish at 6"
That's a lot of blocks to make.
Another suggestion would be to investigate doing some strip piecing so you're not cutting a million squares. You can still get a very random feel with that method. And the sewing would go so much faster.
Also, perhaps doing a 16 patch instead of the 9 patch - that would cut down on the number of blocks, and wouldn't really change the look of the quilt.