The US fluid ounce (fl oz) is a volume unit equal to approximately 29.574 milliliters, used to label beverages, cosmetics, and personal care products in the United States. Beverage cans, shampoo bottles, and skincare serums all display their contents in fluid ounces for American consumers. One fluid ounce equals exactly 1/128 of a US gallon or roughly 2 tablespoons.

The tablespoon (tbsp) is a volume unit equal to 3 teaspoons or approximately 14.787 milliliters, primarily used in cooking recipes and nutritional labels. In the kitchen, one tablespoon of butter, oil, or sugar provides a consistent measure regardless of the spoon's physical size. One US tablespoon equals exactly 0.5 US fluid ounces.