There are 5 and 1/3 tablespoons in a 1/3 cup of butter. This information is simply a math problem that involves converting from cups to tablespoons by using the factor that one stick of butter, which is equal to eight tablespoons, is also equivalent to 1/2 cup.
By using the proportion of 8 tablespoons/(1/2 cup) = x/(1/3 cup), a person can solve for x, the number of tablespoons . By cross multiplication, it is evident that 8/3 = x/2, and x = 16/3 = 5 1/3 tablespoons. When conversion factors for butter are necessary for a recipe, another conversion factor that is useful is knowing that 1/4 cup of butter is equal to 4 tablespoons or one-half stick of butter.