I have made a few disappearing 9 patch with 5″ squares & basically know that if I use 3 fabrics it takes 3 yards of 2 fabrics & 1.25 yard of fabric for the center square.
I had some other fabrics I want to make one out of but I’m just short of the yardages I need so I want to make the squares smaller. This is what I calculated for making a Disappearing 9 Patch with 4.5″ squares & 3 different fabrics.
I have 3 fabrics, White, Multi, & Red.
Using 43″ WOF (width of fabric) I would need:
White = 2.75 yards, Multi = 2.75 yards & Red (the center square of the 9patch) 0.75 yards. I’m pulling this out of my stash.
Number of strips to cut at 4.5″ width- White 22 strips, Multi 22 Strips & Red 6 strips.
You should be able to cut 9 squares from each strip of fabric = 4.5″ square.
Your block will have 4 white squares, 4 Multi squares & 1 Red square in the center. You should decide which fabric you want to be the larger square before piecing the 9 patch block & put them in the outer corners. Sew your 9 patch together. Press the top row & bottom row seams away from the center square. Press the center row towards the center square. This will help the rows nest together before sewing.
Then cut it across the center in both directions.
Turn two sections to so that the small red square faces outward and leave the remaining two in place. See below:
Sew back together.
You will have enough blocks to place 7 across and 7 down. This will give you approximately 80.5″ x 80.5″ size. You can add borders to make the size you prefer. I would probably add 2 borders maybe a 2.5″ and then an 8″ border to get the quilt to 90″ square.
2.5″ border would require about 9 strips so about 2/3rd yard of fabric.
an 8″ border added after the 2.5″ border would require 9 strips 8″ wide so 2 yards of fabric.
Now I’m going to go sew the rest & double check the measurements.