One fluid ounce is the equivalent of six teaspoons. The fluid ounce and the teaspoon are among the different units of volume used in recipes in the United States. A teaspoon is also often used to measure dosages of liquid medication.
Differentiating between ounces and fluid ounces is important here because while fluid ounces are used to measure volume, weight ounces are units of mass that cannot be converted to teaspoons. Three teaspoons make one tablespoon, so two tablespoons is also the equivalent of one fluid ounce. Since eight fluid ounces make up one cup, one cup is also equivalent to 48 teaspoons and 16 tablespoons.