Was off surfing from my e-mail this morning and tripped across this. Hope others who want to make a jelly roll race from scraps might find this useful. I found out by using the no 36 that I would need 70 yards of strips for the size I want. You get to choose the width of strips and length and width of quilt.
The link is
http://http://www.joscountryjunction...ce-calculator/. Scroll down just a bit.