The milliliter (mL) is a metric unit of volume equal to one-thousandth of a liter, widely used in medicine, cooking, and chemistry for measuring small liquid quantities. Cough syrup dosages, perfume bottles, and laboratory reagents are all commonly labeled in milliliters. One milliliter equals exactly one cubic centimeter, making it interchangeable with cm³ in scientific contexts.

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.