If you wanted, say, a 1 inch binding, you would leave 3/4 inch of batting and backing beyond the raw quilt edge. When you sew binding to your quilt edge you use a 1/4 inch seam and when you fold if over you will be going over your 1/4 inch seam plus 3/4 inch of batting and backing to equal 1 inch fully stuffed binding. For double fold binding your fabric strips would have to be 5 inches or so, I forget the exact equation.