I make 2.5" cuts the length of the fabric, I then cut each end on a 45 degree angle and sew the ends together. I then fold and press the entire length in half...sew on one side of the quilt with 1/4" selvage; then fold over to the other side of quilt and either hand sew or decorative machine stitch. Based on my practice but using your 3" cut this is my calculation: One yard should be ample for binding based on 36" (one yard) X 44" (width); 44" divided by 3" = 11 strips.....11 strips X 36" = 396" ; however, you said 'bias' binding. My experience with bias binding is not so good, so I can't help you with that. Good luck!