Reddit reviews Taking the Math Out of Making Patchwork Quilts
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Quilts can be (and are) any size you want that suits the pattern and the bed -- and by "suits" I mean covers the mattress with a drop of any size you want as long as it isn't trailing on the ground. Anyone who tells you that a quilt "must" be a certain size is wrong.
Calculating yardage is a big part of the fun for me (but then I've never been normal) but I understand that it can be daunting for most people.
If you can obtain a copy of "Taking the math out of making patchwork quilts" by Bonnie Leman and Judy Martin (there are some available through Amazon and probably other second-hand sellers, too) it will help you enormously. I have also seen various pdf calculators but I never bookmarked or downloaded them (sorry).
Since a nine-patch can be strip-pieced, and since your cutting for the disappearing part is based on an even division of the block, you are not confined to one specific size of block. Adjust it to suit the fabric and the bed.
OK, I'm going to post this and then do some real calculations for you and post them in an hour or so.
As for your actual calculations ... umm ... 5 x 9 = 45 and 4 x 8 = 32. And we generally allow 42" across the fabric width to allow for shrinkage after washing (if you pre-wash) and variations among manufacturers.