I'm quite new at quilting, and am finding quilts that I would like to try, but they don't list yardage. I have block size and HST size, but am at a loss as to where to go from here. (Gotta tell you, math was never my strong suit!) How do you experienced quilters figure out how much fabric to buy? BTW, my block size is 16", with 4" HST's throughout, with 4 different colors, 12 of one, 10 of one, 8 of one, amd only 2 of the last one. Thanks for your help.