One U.S. fluid ounce is 1⁄16 of a U.S. pint , 1⁄32 of a U.S. quart , and 1⁄128 of a U.S. gallon .
Common volume units are the teaspoon , tablespoon ( 3 teaspoons ) , fluid ounce ( two tablespoons ) , cup ( 8 ounces ) , pint ( 2 cups , or 16 fluid ounces ) , quart ( 2 pints , or 32 fluid ounces ) , US gallon ( 16 cups , 128 fluid ounces , or 3.8 liters ) .