i make car robes, laprobes, baby quilts, and most wallhangings the same size... 45 x 54 because it is ONE queen size batt cut into 4 pcs, the backing can be 45" if you pay attention or have 60" fabric (no piecing) and the numbers are products of 9, which makes 9 inch blocks easy to do with a total of 9" in borders.... easy to design for...