That 7/8 yard is the rounded-up shop cut for 2 1/2 inch strips on 42 inch fabric.
Measure after quilting. The sewing walkthrough is how to bind a quilt. For the rest of this size see how much fabric for a king quilt.
A worked answer
Double-fold binding for a 110 by 95 inch king — strip count, yardage, and a card you can change.
That 7/8 yard is the rounded-up shop cut for 2 1/2 inch strips on 42 inch fabric.
Measure after quilting. The sewing walkthrough is how to bind a quilt. For the rest of this size see how much fabric for a king quilt.
For a 110 by 95 inch quilt, cut 2 1/2 inch strips. The perimeter is 420 inches, plus 10 inches for joins. That is 11 strips from 42 inch fabric, which comes to 7/8 yard.
Measure the quilt after it is quilted. Binding cut for the pattern ideal size is often short of the quilt you actually have.