Backing size
I just can’t understand why I need so much fabric. Any help would be appreciated. My quilt size with overage is 54” wide by 72” long. I seem to come up with needing 2 yards of fabric. WOF 42 +42 =84. 36 + 36 =72. Every calculator and even the instructions call for 3 yards of fabric. And I thought I was good at math! Apparently that’s a LOL! What am I missing here? Please help. I’m machine quilting in the ditch. This is not going to a long arm quilter.