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

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

About Femtoliter

The femtoliter (fL) is a metric unit of volume equal to one quadrillionth of a liter. It is commonly used in medical diagnostics, hematology, and cellular biology to measure the volume of blood cells and microscopic biological structures. Because femtoliter measurements occur at a very small scale, they are mainly used in specialized scientific and clinical environments where high precision is required.