When I cut using a ruler and rotary cutter - my ruler would be on x measurement, but my actual cut is x plus a thread or two more .

So, after several cuts, the theoretical amount of fabric used should be exactly strips cut times the width of the strip.

However, in my experience, I ended up short with that thinking


Example :ten strips cut 2.5 inches wide

Theoretical :. 10 * 2.5 = 25

Actual: 10 * 2.52 = 25.2

This only really matters when one has an "iffy" amount of material available.

Thanks to everyone for all the help you have provided. After reviewing all the replies over & over & sleeping on it, I've decided to try for a different block pattern. This quilt top is going to be for a special charity that I donate to & I don't want to take the chance of coming up short because of a bad calculation on my part or because of a miscut causing me shortage of fabric. I did find a third piece of 2 yard fabric in my stash that I can use so I will look for a 3 color quilt top that I can use with the pieces that I have.
Thanks again....y'all are the best!

Theoretical measurements to get a 12 x12 finished dnp type block using 1/4 inch seam lowances.

Cut the corner squares 4-1/2 × 4-1/2
Cut the center side pieces 4-1/2 × 5
cut the center square 5 x 5 inches