Remember that you need double the yardage of shell material (the ripstop 1.1) that you use for the insulation because the quilt needs a top and a bottom.

Also the weights are for square yards but the material and insulation is sold in linear yards (60" widths). Since most quilts are about 6 feet long (2 linear yards) and more than 36 inches wide (1 linear yard) there is more than 2 quare yards of insulation and more than 4 square yards of shell material in a quilt.

The other thing is that some people put snaps and drawcords at the top to snug the quilt around their necks. That weighs something.