Need to know what the finished size of your quilt is. If it is queen sized I generally purchase 3yards of wide. This also ( generally) gives enough for a king as long as it's not over 100" long/ wide. But you decide by the finished size of the top-- if top measures 90" X 72" (2 1/4- 2 1/2 ) would be plenty, leaving e generous amount to trim off/ use for another project.