This is new to me, thank you for posting that link.

I have used it 2 or 3 times and I love it.

I learned that method on Simply Quilts about 20 years ago, I haven't used it in years though but there are tutorials on the technique.

Learned this method from John Flynn site and have had good luck with it.

Have used it for years -- works great.

Yes that is king size, but it is 2 sections sew together - 4 rectangles.

Yes, I've done it before. However, didn't the way to calculate it. Thanks for the reference.

Has anyone used the multipatch calculator recently? It worked great and saved me tons of fabric. Now I just get a blank web page. Also, I find that the Jinny Beyer pdf works in some browsers and/or pdf viewers and not others. What is the current experience of others? Has anyone bought the John Flynn app that automates his calculations?

John Flynn came up with this method decades ago when his sister asked him to figure out how she could make a backing fit her quilt and she didn't have enough fabric. It works great. I have used it many times.

https://www.flynnquilt.com/free-lessons.htm This explains how it done and gives a formula.

Read how to weed whack a rag quilt too!