How ounces to milliliters are calculated
One fluid ounce is a fixed number of milliliters, so the conversion is one multiplication.
ml = fl oz × 29.5735 (US) or 28.4131 (Imperial)
- A US fluid ounce is exactly 29.57353 milliliters.
- An Imperial fluid ounce is exactly 28.41306 milliliters, about 4% smaller.
- Multiply your ounces by the figure for the ounce type you picked.
- A weight ounce (28.3495 g) is not a volume — use a weight converter for dry ingredients.
Worked example — 8 US fluid ounces × 29.57353 = 236.59 ml, which is 0.237 litres or just under one 240 ml US cup.
Common amounts converted
| Fluid ounces | US ml | Imperial ml | Litres (US) | US cups |
|---|---|---|---|---|
| 1 fl oz | 29.6 ml | 28.4 ml | 0.03 L | 0.12 cups |
| 2 fl oz | 59.1 ml | 56.8 ml | 0.059 L | 0.25 cups |
| 4 fl oz | 118.3 ml | 113.7 ml | 0.118 L | 0.49 cups |
| 8 fl oz | 236.6 ml | 227.3 ml | 0.237 L | 0.99 cups |
| 12 fl oz | 354.9 ml | 341 ml | 0.355 L | 1.48 cups |
| 16 fl oz | 473.2 ml | 454.6 ml | 0.473 L | 1.97 cups |
| 24 fl oz | 709.8 ml | 681.9 ml | 0.71 L | 2.96 cups |
| 32 fl oz | 946.4 ml | 909.2 ml | 0.946 L | 3.94 cups |
Swipe the table sideways to see the rest.
To go the other way, switch the converter above to ml → Ounces.
Things to consider
- Check whether your recipe uses US or Imperial ounces before you convert.
- For baking, weigh dry ingredients instead of converting volume.
- Oven trays and jugs are marked in ml, so round the result to what you can measure.
Frequently asked questions
Is a fluid ounce the same as an ounce?
No. A fluid ounce measures volume, an ounce measures weight. Water is close to 1 fluid ounce per ounce, but flour, oil and honey are not.
How many milliliters are in an ounce?
29.57353 ml in a US fluid ounce and 28.41306 ml in an Imperial fluid ounce.
What is 8 ounces in milliliters?
8 US fluid ounces is 236.59 ml. Eight Imperial fluid ounces is 227.30 ml.
Is this the same as a cup?
A US cup is 240 ml, so 8 US fluid ounces (236.59 ml) is just under one cup. Metric cup measures vary by country.
How do I turn milliliters back into ounces?
Divide the milliliters by 29.57353 for US fluid ounces, or 28.41306 for Imperial. You can also switch this converter to ml → Ounces.
Results are estimates for general information only, not financial, medical or professional advice.