My third Quick Reference Chart is a guide for calculating the number of blocks required to achieve the ideal size for the three most popular quilts, depending on the initial size of the block: I prefer to keep my quilt blocks under 10" because I love working on smaller blocks but I did include 11" and 12" layouts as well, just to be helpful. This chart is a guide for a horizontal layout and doesn't take into account any sashings that you may wish to include, so you will have to modify your…