Which ounce does this use?

The US fluid ounce, exactly 29.5735295625 mL (1/128 of a US gallon). A UK fluid ounce is 28.4130625 mL; switch to UK fl oz in the full unit converter.

How many ounces is a 500 mL bottle?

500 mL is 16.907 US fluid ounces, a bit more than a 16 fl oz US pint. A 330 mL can is 11.16 fl oz.

Is the airline 100 mL liquid limit 3.4 ounces?

Yes: 100 mL is 3.38 US fl oz, which US rules round to 3.4 oz.

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mL to Fluid Ounces

Milliliters to US fluid ounces for bottles and drinks.

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Exact NIST Factors

mL to oz

Convert milliliters to US fluid ounces

From

1 milliliter = 0.0338140227 US fluid ounces

Formula: fl oz = mL ÷ 29.5735295625

Decimals

Milliliters to US fluid ounces table

Milliliters (mL)	US fluid ounces (fl oz)
1	0.0338140227
2	0.0676280454
3	0.1014420681
4	0.1352560908
5	0.1690701135
6	0.2028841362
7	0.2366981589
8	0.2705121816
9	0.3043262043
10	0.338140227
15	0.5072103405
20	0.676280454
25	0.8453505675
50	1.690701135
100	3.38140227

Calculated on your device with exact factors from NIST and the SI.

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How to convert mL to oz

Three steps, all in your browser.

1
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mL to Fluid Ounces: what to know

Milliliters are the metric unit for drinks, medicine, cosmetics and baby bottles. In the United States the same amounts are labeled in fluid ounces. The US fluid ounce is 1/128 of the US gallon, which NIST Handbook 44 defines as exactly 231 cubic inches (3.785411784 L). That makes one US fluid ounce exactly 29.5735295625 mL, so fl oz = mL ÷ 29.5735295625.

Worked examples: a 250 mL glass is 8.454 US fl oz; a 750 mL wine bottle is 25.36 fl oz; a 1 L water bottle is 33.81 fl oz; a 60 mL baby bottle feed is 2.03 fl oz. US nutrition labels round a serving cup to 240 mL and a fluid ounce to 30 mL, so label values can differ slightly from the exact conversion.

The UK (imperial) fluid ounce is a different size: 1/160 of an imperial gallon, or exactly 28.4130625 mL. 500 mL is 16.91 US fl oz but 17.6 UK fl oz. This page uses US fluid ounces; the full unit converter offers both. Neither should be confused with the ounce of weight (28.35 g).

Popular uses

Reading bottle and can sizes in US fluid ounces
Converting baby formula and bottle feeds
Checking travel-size toiletries against liquid limits
Converting cocktail and coffee recipes

Tips for the best result

Quick estimate: divide mL by 30.
Check whether a recipe is American or British before using fluid ounces.
For medicine, use the dosing device that comes with it rather than converting kitchen measures.

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