I used this method a couple years ago to bind a queen size quilt. I don't remember how many yards it took, but surprisingly little. For those who want to know, yes it does work for any width of bias you need, but of course you'll have to use more fabric if the strips are wider. This method has been around forever and can be found in old sewing books. I used to have a bookmark for a site that had a chart showing how much fabric you'd need to make strips of a certain width and length, but lost track of that when a computer crashed.