Sewbizgirl, the center of the quilt ended up 48x68. Like Paintmejudy said, you need six repeats of your fabric to make the six identical sections of each hexagon. Since my fabric had a 24" repeat, I needed just about 4 yards (6 times the 24" repeat divided by 36"). A fabric with a smaller repeat will need less fabric but give you a smaller quilt; a larger repeat, more yardage, bigger quilt. You can also use six layers of two repeats each if you have fabric with a smaller repeat, but want a larger quilt. And you don't have to use all of your hexagons if you don't like some of them or you have an odd number. I had seven extras. You have a lot of latitude.