How to Make Continuous Bias Quilt Binding

Use the quilt binding calculator's final recommended square measurement. For the 60 by 80 inch example, cut one 29½ by 29½-inch fabric square. You need one fabric square, not two squares.

Cut that one square diagonally from one corner to the opposite corner. This creates two triangles from the same fabric square.

Reposition the two triangles into a parallelogram. Place the straight-grain edges right sides together, sew with a ¼-inch seam, and press the seam open.

On the wrong side of the parallelogram, mark parallel cutting lines at the selected strip width. For the example, place the lines 2½ inches apart.

Bring the straight edges right sides together to form a tube. Offset the edges by one marked strip so each marked line meets the next line across the seam. The tube will look twisted. That is correct. Pin carefully, sew with a ¼-inch seam, and press the seam open.

Begin at the overhanging tail and cut continuously along the marked spiral. Do not cut each ring separately. The tube opens into one long continuous bias strip.

Fold the strip in half lengthwise with wrong sides together and the long raw edges matched. Press gently without stretching the bias edges. The continuous bias binding is ready to attach to the quilt.