One fluid ounce is equal to 1/8 of a cup or 2 tablespoons. There are 3 teaspoons in a tablespoon. One fluid ounce is also equal to 25 milliliters.
It is difficult to measure 1 fluid ounce with a standard liquid measuring cup because there isn't typically a line that denotes 1/8 of a cup. Therefore, it's best to use measuring spoons, such as a teaspoon or tablespoon when measuring 1 fluid ounce. Measuring spoons usually come as a set with 1/4, 1/2 and 1 teaspoon measurements, as well as a 1 tablespoon measurement. The appropriate spoon should be filled to the top without letting any liquid spill over to get an accurate measurement.