Oz Ml Converter
Convert fluid ounces (fl oz) to milliliters (mL) and vice versa. Supports US customary and Imperial UK fluid ounce standards with bidirectional conversion for cooking, baking, science, and everyday measurements.
About This Calculator
Our ounces to milliliters converter is a free online tool that converts between fluid ounces (fl oz) and milliliters (mL) with support for both US customary and Imperial (UK) fluid ounce standards. Whether you need to convert a recipe from US to metric, measure liquids for a science experiment, or work with international volume units, this converter delivers accurate results instantly.
The conversion factor differs between the two fluid ounce standards. The US fluid ounce equals approximately 29.5735 mL, while the Imperial UK fluid ounce equals approximately 28.4131 mL. The difference stems from the historical definition: the US fluid ounce is 1/128 of a US liquid gallon, whereas the Imperial fluid ounce is 1/160 of an Imperial gallon. Our converter supports both directions — ounces to milliliters and milliliters to ounces — so you can work with any input unit.
This tool is ideal for cooks and bakers following international recipes, students studying volume conversions, scientists and lab technicians needing precise liquid measurements, and anyone working with both metric and imperial volume units. The bidirectional functionality lets you start from either unit and get the exact equivalent in the other.
Regional Notes
United States: US customary fluid ounces are the standard for measuring cooking liquids, beverages, and over-the-counter medicine doses. One US cup equals 8 fl oz, and a standard soda can holds 12 fl oz (355 mL).
United Kingdom: The UK uses the Imperial fluid ounce for some packaged goods and traditional recipes, though milliliters and liters are now more common for everyday measurements. UK pint glasses (20 Imperial fl oz) are larger than US pints (16 US fl oz).
India: India uses the metric system almost exclusively (milliliters and liters). Use the milliliters-to-ounces direction to convert metric volumes to US or UK fluid ounces when working with international recipes or imported products.
Frequently Asked Questions
How many milliliters are in a fluid ounce?
There are 29.5735 milliliters in a US customary fluid ounce, while an Imperial (UK) fluid ounce contains 28.4131 milliliters. The US fluid ounce is about 4% larger than the UK fluid ounce, so it is important to select the correct standard for accurate results.
What is the difference between US and UK fluid ounces?
The US fluid ounce is defined using the US liquid gallon (1 fl oz = 1/128 US gal), while the Imperial fluid ounce is defined using the Imperial gallon (1 fl oz = 1/160 Imperial gal). This results in 29.5735 mL per US fl oz versus 28.4131 mL per UK fl oz, a difference of approximately 4%. The UK fluid ounce is slightly smaller.
How do you convert fluid ounces to milliliters?
To convert US fluid ounces to milliliters, multiply by 29.5735. To convert Imperial UK fluid ounces to milliliters, multiply by 28.4131. For the reverse conversion from milliliters to fluid ounces, divide the milliliter value by the appropriate conversion factor.
Is a fluid ounce the same as a weight ounce?
No. A fluid ounce (fl oz) measures volume, while an ounce (oz) measures weight or mass. One fluid ounce of water weighs approximately 1.043 ounces, but this varies by the liquid's density. This calculator converts fluid ounces to milliliters — for weight conversions use an ounces to grams converter.
How many milliliters are in 8 fluid ounces?
Eight US fluid ounces equal approximately 236.59 milliliters. This is the volume of a standard glass of water. Eight UK fluid ounces equal approximately 227.30 milliliters. The difference between the two is about 9 mL, which is noticeable in cooking and baking recipes.
Is the Oz Ml Converter free to use?
Yes, this ounces to milliliters converter is completely free to use with no registration or limits. Bookmark it for quick volume conversions whenever you need to convert between fluid ounces and milliliters for cooking, baking, science, or everyday measurements.