I was looking for a 12" block to base a placemat on. I knew I wanted 12" (to end 12x18"), and I flipped through a block-of-the-day calendar I have. Found the perfect block for the 4 fabrics I need to use. Cut all the blocks - just barely, out of 2 of the fabrics. Started sewing and when I went to trim the center square it was 1" smaller than I expected. Double checked the other bits, and yep. It's a 10" block I found. What an idiot I am
So, I guess the blocks will get a 1" frame around them - won't look as good as it should have, since one of the fabrics I ran out of is the background.