when i want a quilt to fit my bed i first measure the actual top of my mattress, then i measure the drop i want, i add 18" to the length for a pillow tuck. after making a couple quilts that were WAY HUGE i have got lots better at measureing. if i have a large center design when that part is done i lay it in the middle of the bed and then decide what i need to add around it to bring the quilt to the top of the bed size, then i go from there getting it the size i want. a queen size mattress is 60" x 80" that is just the top from one top edge across to the other top edge, the other measurements are including what ever drop the pattern designer came up with. a queen batt is 90" x 108...this is giving you a 10"+ drop on each side (you need a little extra all the way around before quilting) it is best to measure and make your quilt the size you want, not the size someone else made for 'their' bed.