Fluid ounces to Milliliters Converter

The converter above is already set to fluid ounces and milliliters, so you only need to enter your number. The result updates as you type, and nothing is sent anywhere.

1. Type your value in the Value box, for example 8. Decimals and negative numbers are accepted.
2. Check that From shows fluid ounces and To shows milliliters. Both menus can be changed if you need a different pair.
3. Read the answer in the large result box. The note under it shows the exact factor used for one fluid ounce.
4. Press Copy result to put the answer on your clipboard, or Swap units to convert in the opposite direction.
5. Look at In every unit on the right to see the same amount in all the other volume units.

One fluid ounce is about 29.5735 milliliters, so the formula is milliliters = fluid ounces x 29.5735. Going the other way, one milliliter is about 0.033814 fluid ounces. A US fluid ounce is about 29.57 milliliters, slightly more than the imperial fluid ounce of 28.41 milliliters. A milliliter is one thousandth of a liter and equals one cubic centimeter.

Worked examples with the same factor:

• 8 fluid ounces: 8 x 29.5735 = 236.588 milliliters
• 20 fluid ounces: 20 x 29.5735 = 591.471 milliliters
• 80 fluid ounces: 80 x 29.5735 = 2,365.88 milliliters

Multiply by 30: 8 fluid ounces is about 240 ml, exactly 236.6.

To check the converter by hand, take 20 fluid ounces and apply the rule once: the result should be 591.471 milliliters. If you go back again with the reverse factor 0.033814 you land on 20 fluid ounces, which confirms that the two directions agree. Rounding the factor to fewer digits for mental math gives a result that is close but not identical, so use the tool when the last digits matter.

These reference values come from the same factor the converter uses, so they match what you see above. Use the table for common amounts, and the converter for anything else.

Volume units are the most confusing family because the same names mean different amounts in different countries. The US customary system and the British imperial system both use gallons, pints and fluid ounces, but they are not equal, and neither matches the metric cup used in many recipes. This converter uses US customary measures for gallons, cups, tablespoons, teaspoons and fluid ounces, and exact metric definitions for liters and milliliters.

Use the table as a sanity check rather than a substitute for the converter. A liter is a little more than a quart and a quarter of a US gallon, and a milliliter is a thousandth of a liter, so a result that is wildly different from those landmarks probably used the wrong unit. When a recipe matters, weigh the ingredient if the recipe gives a weight.

US recipes, bottle sizes and coffee cups use fluid ounces, while most of the world measures liquids in milliliters.

Measuring spoons and cups vary by country: a metric cup is 250 ml, a US legal cup is 240 ml and a US customary cup is 236.6 ml. For baking by weight, a scale is more consistent than any volume conversion because flour and sugar pack differently.

Related pages: Milliliters to Fluid ounces Converter for the reverse direction, and the milliliters to cups and liters to milliliters pages. For other volume units use the volume converter.

The page keeps no history, so each visit starts again from the defaults, 8 fluid ounces. Your numbers are processed by JavaScript in your own browser and are never sent to a server, which makes the converter safe for private figures such as medical, financial or work measurements.