I don't know where I got the idea that a King is 98x98. I think Dunster is correct on this. I will get out the graph paper.
Thanks everyone.

When I made a custom quilt bedspread for my new bed, I measured my actual bed. My bed is a queen, with a Temperpedic mattress (which tend to be thicker than some) on a canopy frame (again, taller than average), so my quilt bedspread is 110” x 112”. If you are making it for your bed, or whomever’s bed, measure the bed and make it that size.

If you use sashing, that throws it all off. I want to cover the mattress with the main square and then some borders and some drop. But that is just me. That's why I stick to Queen size.

Marcia

Did everyone forget the borders? On a quilt that size the borders (unless you are skipping them altogether) need to be about 5 - 6" wide to be in scale. That would knock off a block in each direction. Will there be any sashing? Most log cabin quilts skip sashing, but I have seen it very nicely done.