Quilters! :!:
one NEVER loses fabric when the cut edges do not line up.
One has simply been given the added bonus of the seed fabric for your next scrap quilt!
Of course, if you had your fabric cut to the exact size you think you needed, you might be a little short, but even that is an opportunity to do something different than you started out planning.
isn't it wonderful how quilting encourages us to let go of pre-conceived ideas? <g>