How to convert milliliters to fluid ounces
To convert milliliters (mL) to fluid ounces, divide the milliliter total by the conversion factor for your target region:
US Fluid Ounces = Milliliters ÷ 29.5735 Imperial (UK) Fluid Ounces = Milliliters ÷ 28.4131 Example: Converting 750 ml (Standard Wine Bottle) 750 ÷ 29.5735 = 25.36 US fl oz 750 ÷ 28.4131 = 26.39 UK fl oz Quick 30-to-1 mental calculation trick
For instant estimates, divide the milliliter amount by 30. While 30 mL is slightly larger than a true US fluid ounce (29.57 mL), it gives a quick estimate within 1.5% accuracy:
- 60 mL ÷ 30 = ~2 fl oz
- 150 mL ÷ 30 = ~5 fl oz
- 300 mL ÷ 30 = ~10 fl oz
TSA carry-on rules & global packaging benchmarks
Understanding mL-to-ounce equivalencies prevents travel delays and clarifies metric packaging labels:
- 100 mL (TSA 3-1-1 Rule Limit): Equals 3.38 US fl oz. TSA and international airport security cap liquids at 3.4 oz to align with this standard 100 mL international safety ceiling.
- 330 mL (European Beverage Can): Equals 11.16 US fl oz—slightly smaller than the standard 12 fl oz American drink can.
- 500 mL (Metric Half-Liter): Equals 16.91 US fl oz, which is why standard bottled water is marked as "16.9 fl oz".
Milliliter to fluid ounce conversion chart
Common liquid volumes translated across US Customary and British Imperial systems:
| Milliliters (mL) | US Fluid Ounces (fl oz) | Imperial (UK) Ounces | Common Container / Reference Context |
|---|---|---|---|
| 5 mL | 0.17 fl oz | 0.18 fl oz | Standard liquid medicine teaspoon |
| 15 mL | 0.51 fl oz | 0.53 fl oz | Standard tablespoon dose |
| 30 mL | 1.01 fl oz | 1.06 fl oz | 1 US fluid ounce benchmark / Standard shot glass |
| 100 mL | 3.38 fl oz | 3.52 fl oz | TSA airport carry-on liquid maximum |
| 250 mL | 8.45 fl oz | 8.80 fl oz | 1 Metric Cup / Single juice box |
| 330 mL | 11.16 fl oz | 11.61 fl oz | Standard imported soda / beer can |
| 500 mL | 16.91 fl oz | 17.60 fl oz | 0.5 Liter plastic water bottle |
| 750 mL | 25.36 fl oz | 26.39 fl oz | Standard wine / spirits bottle |
| 1,000 mL (1 L) | 33.81 fl oz | 35.20 fl oz | 1 Liter pitcher / Large water flask |
Need to convert fluid ounces back to milliliters? Use our Oz to mL Converter or try our Cooking Converter.
Frequently asked questions
How many ounces is 100 mL for airport carry-on travel?
100 mL is equal to 3.38 US fluid ounces (or 3.52 Imperial fl oz). Transportation security agencies like the TSA specify a 3.4 oz limit so travelers can bring standard 100 mL international containers through security.
Why is a 500 mL water bottle labeled as 16.9 fl oz?
Dividing 500 mL by the US factor of 29.5735 gives 16.907 US fluid ounces. Beverage manufacturers round this to 16.9 fl oz for clear labeling.
How many fl oz is 250 mL?
250 mL equals approximately 8.45 US fluid ounces (or 8.80 UK Imperial fl oz).
Is a fluid ounce (fl oz) the same as a weight ounce (oz)?
No. Fluid ounces measure volume, whereas standard ounces measure mass/weight. Milliliters measure volume, so they convert directly to fluid ounces regardless of density.