I like wider bindings on my quilts, usually .625", so I cut mine at 3", but I know that's not the norm. Here's the way I learned to figure it for double fold bindings:
1. Take the width you want your finished binding to be (for instance, ½")
2. Multiply that number by two (1") (for front and back)
3. Add ¼" to that number (1 ¼") (for the seam allowance on the front, there is none on the back)
4. Multiply the new number by two (2 ½") (for the folding)
or the quick way:
Multiply the finished width by four and add a half inch for the seam allowance. Works every time! :wink: