I round most all my quilt corners and I cut my bindings 2-3/4" wide and sew on with 3/8" seam and I sew about 8 or 9 crosswise grain strips together and I usually have enough. I might cut an extra or two more - if quilt is larger and I pull a little as I stitch binding on with a walking foot. If I have any leftover, I save them for scrappy bindings on scrappy quilts. Trying to add more binding strips on a large quilt is not easy.