Units of butter is a term used to describe the amount of butter that is typically used in a recipe. The term 'PATS' is an acronym for Pounds, As, Tablespoons, and Sticks, which are all units of butter. A pound of butter is equal to 4 sticks, 16 tablespoons, or 454 grams. A stick of butter is equal to 1/4 pound, 8 tablespoons, or 113 grams. A tablespoon of butter is equal to 1/2 ounce, or 14.2 grams. Therefore, when a recipe calls for a certain number of units of butter, it can be measured in any of these four units.