If it multi color that I can use in a border I buy at least 3yds. If it is on sale and may be used as a backing I may buy the entire bolt, have done that, got 3 backings out of it; otherwise at least 7 -8 yds. I really hate to buy backings at retail price. Neutrals I buy 1- 3 yards, I like to use more than one fabric for backgrounds so usually buy 1 yds unless on sale.