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The block size is 11" x 11" finished (11.5" x 11.5" raw edge). The sashing strips are 2" x 11" finished. Posts are 2" x 2" finished.
It would take (4) strips of binding. If you make the binding strips 2.25" wide, you would need 1/4 yard of fabric. If you make the binding strips 2.5" wide, you would need 3/8 yard of fabric.
For the backing you will need about 1 and 5/8 yard fabric.