Barbara C, if I am understanding what you are asking, you are wanting to know what size to trim your oversized block units to. Most block components are squares, for example in 4 patch or 9 patch blocks. In a 6 inch finished block, before it is sewn into the quilt, its size is 6-1/2 inches. If this 6 inch finished block is a 9 patch, then each of its components finishes at a 2 inch square. So, in order to get 2 inches finished size in the block, each of the squares making up the 9 patch would need to be trimmed to 2-1/2 inches square. Find your finished size in the block and add 1/2 inch to it to get trimmed size.

This is why a 6 inch finished block is versatile. You can divide 6 by 2 (as in a 4 patch), and get 3 inch finished components, which are 3-1/2 inches before you sew them into the block. Or divide by 3 (9 patch block) for a 2 inch component, or divide by 4 and get 1.5 inches.

Trying to make a 9 patch block fit a finished 8 inch size just leads to lots of crazy numbers- each component would be 8 divided by 3, or 2-2/3 inches finished. Not easy to do with our quilting rulers

Happy quilting, Kathy

**Bardorcon wrote:**
Thank you. Definitely not the answer I was looking for. It is that final squaring up size of each unit I have the most problem with. I can over cut but never sure of what size I need to trim to. I understand what you explained and I am waiting for that page of SIMPLE math formulas your working on. (LOL) What a job ahead of you. Again thanks for respoding. Barbara Conklin