I'm going to be the odd one out here...i always do my binding at 3" then fold. My quilt bindings are generally the width of my walking foot - which gives me about 3/8" seam allowance - or 3/8 - 1/2" binding showing on the front side...usually a little more showing on the back side. It's what works best and easiest for me....so i would suggest you use whatever works best for you - as we have all agreed, there are not quilt police.