Convert US Fluid ounce to Milliliter (US fl oz to Milliliter)

US Fluid ounce (US fl oz) and Milliliter (Milliliter) are both units of volume. With the conversion form below, you can effortlessly and accurately convert us fluid ounce to milliliter. This free online calculator tool makes it simple and easy to perform the conversion from US fl oz unit to the Milliliter unit.

Volume is the measurement of the three-dimensional space occupied by a substance, object, or container. The SI derived unit of volume is the cubic meter (m³), while the liter (L)—defined as exactly 1 cubic decimeter (1 dm³ = 0.001 m³)—is the most widely used metric unit for measuring liquids. The milliliter (mL) is equal to exactly 1 cubic centimeter (1 cm³) and is commonly used for beverages, medicines, laboratory samples, and food products.

Different countries and industries use different volume units depending on local standards and applications. In addition to metric units such as the liter, milliliter, and cubic meter, the US and Imperial systems use units including the fluid ounce (fl oz), cup, pint, quart, and gallon. Since the US gallon (3.785411784 L) and the Imperial gallon (4.54609 L) are different units, accurate conversion is essential for cooking, engineering, manufacturing, scientific research, trade, and international product labeling. Learn more in our complete guide to Volume.

US Fluid Ounce (symbol: US fl oz) is a unit of liquid volume used primarily in the United States. It is part of the US customary measurement system and is commonly used to measure beverages, cooking ingredients, medicines, cosmetics, and packaged consumer products.

The US fluid ounce is defined as 1/128 of a US liquid gallon, making it equivalent to 29.5735295625 milliliters. It differs from the Imperial fluid ounce used in the United Kingdom, which equals approximately 28.4130625 milliliters. Because these units are not interchangeable, accurate conversions are essential for international trade, recipes, product labeling, and scientific applications. This converter follows the official US customary definition, where 128 US fluid ounces = 1 US liquid gallon = 3.785411784 liters. Reference: NIST Guide to the SI – Units Outside the SI.

Milliliter (symbol: mL or mℓ) is a metric unit of volume equal to one-thousandth of a liter (0.001 L) or exactly one cubic centimeter (1 cm³). It is one of the most widely used units for measuring small volumes of liquids and is an accepted unit for use with the International System of Units (SI).

The milliliter is commonly used in medicine, pharmacy, chemistry, biology, food preparation, and everyday life to measure beverages, medicines, laboratory reagents, and other liquids. Medical syringes, graduated cylinders, measuring cups, and laboratory glassware are typically marked in milliliters for precise volume measurement. Under standard conditions, 1 milliliter of water has a mass of approximately 1 gram, making the unit especially convenient for scientific and educational applications. This converter follows the internationally accepted metric relationship, where 1,000 milliliters = 1 liter and 1 milliliter = 1 cubic centimeter (cm³). Reference: NIST Guide to the SI.