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Fluid ounces (US) measure liquid volume in the imperial system; millilitres in the metric one. Recipes, drinks and bottle sizes cross between them, so this converter turns fluid ounces into millilitres and back.
How is it calculated?
The conversion factor
1 US fluid ounce = 29.5735 millilitres.
| To convert | Do this |
|---|---|
| fl oz → ml | multiply by 29.5735 |
| ml → fl oz | divide by 29.5735 |
Note: this is the US fluid ounce. The UK (imperial) fluid ounce is slightly different at 28.41 ml.
Common values
| Fluid ounces | Millilitres |
|---|---|
| 1 fl oz | 29.57 ml |
| 8 fl oz | 236.59 ml |
| 12 fl oz | 354.88 ml |
| 16 fl oz | 473.18 ml |
Worked example
An 8 fl oz cup is 8 × 29.5735 = 236.6 ml (one US cup). A 12 fl oz soda can is 354.9 ml. A 500 ml water bottle is 500 ÷ 29.5735 = 16.9 fl oz.
FAQ
How many ml is 1 fluid ounce?+
One US fluid ounce is 29.5735 millilitres. Multiply fluid ounces by 29.5735 to get millilitres.
How do I convert fluid ounces to ml?+
Multiply the fluid-ounce value by 29.5735. So a 16 fl oz bottle is 16 × 29.5735 = 473.2 ml.
Is this the US or UK fluid ounce?+
This converter uses the US fluid ounce (29.5735 ml). The UK/imperial fluid ounce is a little smaller at about 28.41 ml, so check which system a recipe uses.
How many fluid ounces in a cup?+
A US cup is 8 fluid ounces, which is 236.6 ml. That's why 8 fl oz and “one cup” are used interchangeably in US recipes.
How do I convert ml back to fluid ounces?+
Divide the millilitre value by 29.5735. A 330 ml can is 330 ÷ 29.5735 = 11.16 fl oz.