Hi athomenow,
My really rough way of calculating yardage is based on quilt size:
twin - 6 yds
double - 8 yds
queen - 10 yds
king - 12 yds
Then I divide that amount up, based and the approximate percent of each fabric in the block. That only works for block designs with little waste, though. This quilt has a *lot* of cut off corners, so it uses more.
I did an actual calculation for you, and came up with the following, assuming 9 blocks x 10 blocks (81x90"), and then a 4" border:
Fabric 1 - 3 1/4 yards
Fabric 2 - 3 1/4 yards
Fabric 3 - 2 yards
Fabric 4 - 4 yards
Fabric 5 - 2 yards
Border - 1 1/4 yards
There isn't a lot of extra in these amounts, so you might want to add an extra 1/4 - 1/2 yard of each (if you make as many cutting mistakes as I do!).
If you want, you could sew together the offcuts to make HST's; you'll get 720 from the leftovers, squared up to 2.5" (2" finished size) for a good-sized companion project!