Milliliters to Fluid Ounces Converter
Unit ConversionConvert milliliters to US fluid ounces using the exact 29.5735295625 mL per fluid ounce factor.
Fluid Ounces
Equivalent volume in the selected fluid ounce standard
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Unit Conversion calculators
Converting milliliters to fluid ounces is simple once you know the right factor, but the exact number actually depends on which fluid ounce you mean. A US fluid ounce equals exactly 29.5735295625 milliliters, while a UK (Imperial) fluid ounce is larger, at exactly 28.4130625 milliliters. Most online converters only handle the US version, which gives a slightly wrong answer for anyone working with UK recipes, medication dosing, or British packaging.
This calculator lets you pick either standard before converting, so the result matches whichever fluid ounce your recipe, label, or region actually uses. Enter any amount in milliliters, choose US or UK fluid ounces, and the equivalent updates instantly. The difference is small per ounce, about 4 percent, but it adds up on larger volumes: 500 mL comes out to 16.91 US fluid ounces or 17.60 UK fluid ounces, a gap of over half an ounce.
Below you will find the exact formulas for both standards, a table of common milliliter amounts already converted, and a full explanation of why the US and UK fluid ounce differ in the first place.
How to convert milliliters to fluid ounces
To convert milliliters to US fluid ounces, divide the milliliter amount by 29.5735295625. To convert to UK (Imperial) fluid ounces instead, divide by 28.4130625. Both factors are exact, defined constants, not rounded approximations.
| Standard | 1 fluid ounce equals | Formula |
|---|---|---|
| US fluid ounce | 29.5735295625 mL | fl oz = mL / 29.5735295625 |
| UK (Imperial) fluid ounce | 28.4130625 mL | fl oz = mL / 28.4130625 |
For a quick mental estimate without a calculator, US fluid ounces are close enough to divide by 30, and UK fluid ounces are close enough to divide by 28. For anything you need to be precise about, such as medication dosing or a recipe that has to come out right, use the exact calculator above rather than the rough estimate.
Common milliliter to fluid ounce conversions
These are the milliliter amounts people look up most often, converted to both US and UK fluid ounces so you can find yours without typing it in.
| Milliliters | US Fluid Ounces | UK Fluid Ounces |
|---|---|---|
| 30 mL | 1.01 fl oz | 1.06 fl oz |
| 50 mL | 1.69 fl oz | 1.76 fl oz |
| 100 mL | 3.38 fl oz | 3.52 fl oz |
| 150 mL | 5.07 fl oz | 5.28 fl oz |
| 200 mL | 6.76 fl oz | 7.04 fl oz |
| 250 mL | 8.45 fl oz | 8.80 fl oz |
| 500 mL | 16.91 fl oz | 17.60 fl oz |
| 1000 mL | 33.81 fl oz | 35.20 fl oz |
Converting the other direction, from fluid ounces to milliliters?
US vs UK fluid ounces: what is the difference
The US and UK fluid ounce come from two different historical gallon definitions. The US gallon is based on an old English wine gallon of 231 cubic inches, split into 128 fluid ounces. The UK Imperial gallon, legally defined in 1985 as exactly 4.54609 liters, is split into 160 fluid ounces instead. That different split is why a UK fluid ounce works out smaller as a fraction of its own gallon, but larger in absolute milliliters than a US fluid ounce.
- US fluid ounce: 29.5735295625 mL, used throughout the United States
- UK fluid ounce: 28.4130625 mL, used in the United Kingdom and defined from the Imperial gallon
- The UK fluid ounce is about 4 percent larger than the US fluid ounce
- Nutrition labels, drug dosing, and recipes can all differ depending on which standard was used to write them
If you are working from a British recipe, a UK-labeled medication, or Imperial packaging, use the UK setting above. If you are working from an American source, US is almost always the right choice, and it is this calculator's default.
Frequently Asked Questions
How many mL is in an ounce?
A US fluid ounce is 29.5735295625 mL. A UK (Imperial) fluid ounce is 28.4130625 mL. Which one applies depends on where the recipe, label, or dosage instruction came from.
What is the difference between US and UK fluid ounces?
A UK fluid ounce is about 4 percent larger than a US fluid ounce, 28.4130625 mL versus 29.5735295625 mL. The difference comes from the US and UK defining their gallons differently, then splitting each gallon into a different number of fluid ounces.
Is a fluid ounce a measure of volume or weight?
A fluid ounce measures volume, not weight. It is a different unit from a weight ounce, even though they share a name. For water specifically the two are close in practice, but for anything denser or lighter than water, a fluid ounce and a weight ounce of the same substance will not weigh the same.
How many fluid ounces are in a cup?
A US cup is 8 US fluid ounces. If you need milliliters instead, the Milliliters to Cups Converter handles that conversion directly.
How many fluid ounces are in a gallon?
A US gallon is 128 US fluid ounces. A UK (Imperial) gallon is 160 UK fluid ounces, since the two gallons are defined differently and split into a different number of ounces each.
Can I convert mL to fluid ounces without a calculator?
For a rough estimate, divide by 30 for US fluid ounces or by 28 for UK fluid ounces. For anything that needs to be exact, such as medication dosing, use the real formula (divide by 29.5735295625 for US, or 28.4130625 for UK) rather than the rounded shortcut.
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