it can be anywhere from 5 yards to 15 yards- or more- it depends on the pattern you are using- which should help you figure the yardage requirements. if you are designing your quilt without a pattern I recommend sketching it out on graph paper- to meet the size requirements then you can figure out blocks sizes, how many needed & do the math. remember to add in 1/2" seam allowance for each block-if you come up with a pattern & need help with the math we can help with that- I am currently planning a new bargello quilt which needs 20 different fabrics- 3/4 yards of 18 of them- 3 yards of one & 2 1/2 yards of one...makes a queen....comes out to 19 yards of fabric.