One fluid ounce is equivalent to one-eighth of a cup or two tablespoons. Three teaspoons comprise one tablespoon. One ounce is equivalent to 25 millilitres.
Because ordinary liquid measuring cups lack a line denoting 1/8 of a cup, it is difficult to measure 1 fluid ounce with them. When measuring 1 fluid ounce, it is advisable to use measuring spoons, such as a teaspoon or tablespoon. Typical measuring spoon sets include 1/4, 1/2, and 1 teaspoon measurements, in addition to a tablespoon measurement. To obtain an accurate measurement, the proper spoon should be filled to the brim without allowing any liquid to overflow.