Jessica...You will have to do the math....but I use a 2 1/2 square of fabric for each 1" hexagon. The completed "block" takes 7 hexies, one for the center and six for the circle around the center. The total measurement of each block is 5 1/4". So, measure the bed and add the overhang you want all around and divide each measurement by 5.25. That will give you the approximate number of blocks you will need for the width and length. Then multiply these two numbers together and you will get the total number of hexie blocks you will need to make.

From one yard of fabric you should be able to make 37 hexies (not including the center which is usually a contrasting fabric). I figured it this way: Divide 36 inches (1 yd of fabric) by 2 1/2" (strips) = 14 strips. Then, 14 strips X 40" width in each strip = 560inches. Divide 560 by 2.5 (the amount needed for each block minus the center) = 224. Then divide 224 by 6 = 37.

I think you can take it from here.....Barb