I learned an easy, FAST, way to cut bias binding and I thought I would share. The way the fabric is lined up here, it is open, with the selvage hanging down. You can do this on any size you have or need, the folding instructions are the same. You can even use fabric that doesn't have the selvage, just square it with the grain.
I love this particular cutting ruler, because it has slits to put your rotary cutter in, spaced every 1/2 inch. It makes it possible to cut multiple narrow strips without moving the ruler all the time, keeps the fabric flat and even.