Last night I was working on a quilt project for my guild's Brown Bag Challenge and was doing a bit of designing. This project, which I can't show yet becuase it is always a surprise, required many different sized quarter square triangles. I was a trimming and guessing fool. A BIG light bulb went off after I had to rip one quarter square unit apart. It was laying on my cutting mat and I saw that the original square I had just used to make a three inch finished quarter square triangle was 4¼ inches square! I say to myself, "By George, I think I've got something here...." I quickly whipped up some samples to try this theory out and sure enough, it worked!
So this is what I learned:
The "magic number" for quarter-square triangles is 1¼ inch. All you have to do is add 1¼ inches to the required FINISHED SIZE of your quarter-square triangle unit.
So, for example, if you want a 3" (finished size) quarter-square triangle unit, you need to cut two squares that measure 4¼ inches each. It is perfect every time!
I am sure this is not new news to the majority of quilters, but it sure was news to me. I knew about adding 7/8 of an inch to the finished size to get perfect half square triangle units, but had never made quarter squares for an improvised pattern, and thus I just didn't know this. It's the simple things in life...........
Are there any other Magic Numbers out there I don't know?