Fluid Ounces to Milliliters Converter

A fluid ounce to milliliter conversion translates a volume measurement from the US customary system to the metric system. The US fluid ounce is a unit of volume equal to exactly 29.5735 milliliters, defined as one-twelfth of a US liquid gallon. The milliliter (mL) is a metric unit of volume equal to one cubic centimeter (cm³) or one-thousandth of a liter. This conversion is one of the most commonly needed kitchen and laboratory volume conversions because recipes and product labels in the United States use fluid ounces while most of the rest of the world uses milliliters.

The distinction between fluid ounces and regular (weight) ounces is important. A fluid ounce measures volume, not weight. One US fluid ounce of water weighs approximately 1.04 avoirdupois ounces, but this relationship varies for other liquids depending on their density. The fluid ounce should not be confused with the Imperial fluid ounce used in the United Kingdom, which is slightly larger at 28.4131 mL. This calculator specifically converts US fluid ounces.

Understanding fluid ounce to milliliter conversion is essential for following international recipes, reading European product labels, compounding medications, and performing laboratory measurements. The calculator also shows the equivalent volume in liters, which is useful for scaling recipes to larger quantities or for understanding the metric equivalents of common US beverage sizes.

The conversion uses the exact international agreement definition of the US fluid ounce in terms of the gallon and the liter.

Use this calculator to convert US fluid ounces to milliliters and liters:

1. Enter the fluid ounces: Type the number of US fluid ounces into the input field. You can use whole numbers, decimals, or fractions expressed as decimals.
2. Read the primary result: The main result card shows the conversion to milliliters, computed as fluid ounces multiplied by 29.5735.
3. View the liter equivalent: Below the primary result, you can see the same volume expressed in liters (milliliters divided by 1,000).
4. Check common conversions: The quick reference table shows frequently used fluid ounce to milliliter conversions, including 1 fl oz (29.57 mL), 8 fl oz (236.59 mL, one cup), 12 fl oz (354.88 mL), and 16 fl oz (473.18 mL, one pint).

The calculator updates instantly as you type, so you can try different values without pressing any buttons.

The calculator provides two equivalent volume measurements:

• Milliliters (mL): The primary metric result. Found by multiplying fluid ounces by 29.5735. Milliliters are the standard metric unit for measuring small volumes in cooking, medicine, and laboratory work.
• Liters (L): The larger metric unit. Found by dividing milliliters by 1,000. Liters are useful for understanding the total volume of larger containers and for scaling recipes.

For quick mental reference, remember these anchor points: 1 fluid ounce is approximately 30 mL, 8 fluid ounces (one cup) is approximately 237 mL, and 16 fluid ounces (one pint) is approximately 473 mL. These approximate values are useful for rough estimates in the kitchen, while the calculator provides precise values for accurate measurements.

This conversion is indispensable in cooking and baking. Many international recipes use milliliters for liquid ingredients, while American recipes typically use fluid ounces or cups. A recipe that calls for 12 fl oz of heavy cream requires about 355 mL, while a European recipe specifying 500 mL of cream requires about 16.9 fl oz. Having a reliable converter ensures that recipes turn out correctly regardless of their origin.

In pharmaceutical and medical settings, precise volume measurements are critical for patient safety. Medication dosages are often specified in milliliters, while some legacy systems and nursing documentation may reference fluid ounces. Intravenous drip rates, oral medication volumes, and liquid medication doses must be converted accurately to ensure patients receive the correct amount of medication.

In beverage manufacturing and retail, product sizes are defined differently in different markets. A standard US soda can holds 12 fl oz (355 mL), while European cans typically hold 330 mL or 500 mL. Understanding these conversions helps consumers compare product sizes across markets and helps manufacturers label products for international distribution. The conversion is also essential for craft brewing, where recipe formulations may specify ingredients in either system.