I am working on a quilt and figured: 60 x 80 queen mattress with square 11.5" blocks (12.5" unfinished with half inch seam allowance as doing no-sash qayg). No borders. 8 squares X 8 squares is 92x92.
92-60 is 32 is 16 inches overhang each side
92-80 is 16 inches overhang at bottom and six inches for slope up and over pillows (just pulled up flat on top, not tucked under pillow "bedspread" fashion).
This is what I calculated and now reading here, I am second guessing my vision for the quilt! I had originally planned for 8 blocks by 9 blocks but thought would not work unless was going to bedspread-style around the pillow with a good chunk folded under pillow and we don't make our beds that way. We are casual bed makers; just quickly pull everything up and call it made. Lol. My problem with most handmade quilts is they do not hang long enough over the sides to cover our backs. We thus end up with them on sideways to do the trick. Sometimes this leaves us short on the tootsies or shoulders. The challenge is placement of center design so it is actually in center of bed. It will not go in center of quilt but in the center of the 60x80 area of quilt.