mL to oz: 1 fl oz = 29.57 mL
Divide milliliters by 29.57 to get US fluid ounces. 100 mL is 3.38 fl oz.
Fluid ounces in 100 mL
100 mL / 29.5735 mL per fl oz = 3.38 fl oz
1 fl oz = 29.5735 mL. These are fluid ounces of volume, not ounces of weight. How we calculate this
From: Milliliters. Amount: 100 mL. Fluid ounce: US customary, 29.57 mL.
To convert mL to oz, divide the milliliters by 29.5735, the number of mL in one US fluid ounce. NIST SP 811 defines that ounce as 1/128 of the US gallon. So 100 mL is 3.38 fl oz, 250 mL is 8.45 fl oz and a liter is 33.81 fl oz. Going the other way, 8 fl oz is 236.6 mL, which is one US cup.
Pick the direction under From, type the amount and choose your fluid ounce. US customary is the default. US nutrition labels use a rounded 30 mL ounce, and UK recipes use the Imperial ounce of 28.41 mL.
Quick answer: how do you convert mL to oz?
Divide the milliliters by 29.5735, the mL in one US fluid ounce from NIST SP 811. So 100 mL is 3.38 fl oz and 500 mL is 16.91 fl oz. US nutrition labels use a 30 mL ounce, which gives 3.33 for 100 mL. UK recipes use the 28.41 mL Imperial ounce, which gives 3.52.
Key takeaways
- US fluid ounces = mL / 29.5735, and mL = fluid ounces x 29.5735.
- 1 US fl oz is 29.57 mL, 8 fl oz is one US cup of 236.6 mL, and a liter is 33.81 fl oz.
- Nutrition labels use 30 mL to the ounce; the UK fluid ounce is 28.41 mL, about 4 percent smaller than the US one.
- A fluid ounce is volume. For ounces of weight on a scale, use grams to ounces.
Worked example: 250 mL to oz
A recipe from Europe calls for 250 mL of milk and your measuring cup is marked in ounces. Divide by the US fluid ounce: 250 / 29.5735 = 8.45 fl oz, a little over the 8 fl oz mark. For a UK recipe that lists ounces, the Imperial ounce gives 250 / 28.4131 = 8.80 fl oz.
The reverse: a US recipe asks for 12 fl oz of stock and your jug is metric. Multiply: 12 x 29.5735 = 354.9 mL.
How we calculate this
Formula
Fluid ounces = milliliters / mL per fluid ounce.
100 / 29.5735295625 = 3.38 fl oz.
Your inputs
Amount: 100 mL. Fluid ounce: US customary, 29.5735295625 mL, 1/128 of the US gallon (NIST SP 811).
The converter divides milliliters by the size of the chosen fluid ounce, or multiplies fluid ounces by it. The US customary fluid ounce is 1/128 of the US gallon of 3,785.411784 mL, which is 29.5735295625 mL. The nutrition label ounce is 30 mL by rule, and the Imperial ounce is 28.4130625 mL.
Sources
- NIST Special Publication 811, Appendix B.8 (read 8 October 2026). It lists the US fluid ounce at 2.957 353 E-05 cubic meters, 29.573 53 mL, and the UK fluid ounce at 2.841 306 E-05 cubic meters, 28.413 06 mL. It also lists the US liquid pint at 473.18 mL and the UK pint at 568.26 mL.
- 21 CFR 101.9(b)(5)(viii), the FDA nutrition labeling rule, on the eCFR (read 8 October 2026). It sets the fluid ounce at 30 mL and the cup at 240 mL for labels.
Limits
Fluid ounces measure volume. Turning mL into ounces of weight needs the food's density, which the converter does not know. 100 mL of water weighs about 100 g, but 100 mL of all-purpose flour weighs about 53 g. For weight, use grams to ounces; for cups of a named ingredient, grams to cups. Results show two decimals for fluid ounces and one for milliliters.
Video: How To Convert Milliliters (ml) To Ounces (oz) Explained
mL to oz chart
| Milliliters | US fl oz | Label fl oz | UK fl oz |
|---|---|---|---|
| 5 mL | 0.17 | 0.17 | 0.18 |
| 15 mL | 0.51 | 0.50 | 0.53 |
| 30 mL | 1.01 | 1.00 | 1.06 |
| 50 mL | 1.69 | 1.67 | 1.76 |
| 100 mL | 3.38 | 3.33 | 3.52 |
| 125 mL | 4.23 | 4.17 | 4.40 |
| 150 mL | 5.07 | 5.00 | 5.28 |
| 200 mL | 6.76 | 6.67 | 7.04 |
| 250 mL | 8.45 | 8.33 | 8.80 |
| 330 mL | 11.16 | 11.00 | 11.61 |
| 355 mL | 12.00 | 11.83 | 12.49 |
| 500 mL | 16.91 | 16.67 | 17.60 |
| 750 mL | 25.36 | 25.00 | 26.40 |
| 1,000 mL | 33.81 | 33.33 | 35.20 |
Ounces to mL chart
| Fluid ounces | US mL | Label mL | UK mL |
|---|---|---|---|
| 1 fl oz | 29.6 | 30.0 | 28.4 |
| 2 fl oz | 59.1 | 60.0 | 56.8 |
| 4 fl oz | 118.3 | 120.0 | 113.7 |
| 6 fl oz | 177.4 | 180.0 | 170.5 |
| 8 fl oz | 236.6 | 240.0 | 227.3 |
| 12 fl oz | 354.9 | 360.0 | 341.0 |
| 16 fl oz | 473.2 | 480.0 | 454.6 |
| 20 fl oz | 591.5 | 600.0 | 568.3 |
| 32 fl oz | 946.4 | 960.0 | 909.2 |
US fluid ounce or UK fluid ounce?
They differ by about 4 percent: the US ounce is 29.5735 mL and the UK ounce 28.4131 mL, a ratio of 1.0408. Over a cup or two the gap is a spoonful, but it grows with the amount. The pints differ more, because a US pint holds 16 US fluid ounces (473.2 mL) while a UK pint holds 20 UK fluid ounces (568.3 mL). If a recipe comes from the UK and gives pints, check which pint it means.
Is 1 oz 30 mL?
Only on US nutrition labels, where the FDA rounds the fluid ounce to 30 mL. A US customary fluid ounce, the one on measuring cups, is 29.57 mL. For a single ounce the difference is under half a milliliter. For a liter it is 33.81 ounces against 33.33, about half an ounce.
How many mL in a cup, a pint and a quart?
A US cup is 8 fl oz, 236.6 mL; a US pint is 16 fl oz, 473.2 mL; and a US quart is 32 fl oz, 946.4 mL. For cups from mL in every cup size, use mL to cups. For quarts, use cups in a quart, and for gallons, cups in a gallon.
Frequently asked questions
How many oz is 100 mL? 3.38 US fluid ounces. On a nutrition label it would read 3.33.
How many oz are in 500 mL? 16.91 US fluid ounces, just over a US pint.
How many mL are in 8 oz? 236.6 mL, which is one US cup.
How many oz are in a liter? 33.81 US fluid ounces, or 35.20 UK fluid ounces.
How many mL are in 16 oz? 473.2 mL, one US pint.
Is 250 mL the same as 8 oz? Close: 250 mL is 8.45 US fluid ounces, a little more than 8.
Conclusion
mL to oz is one division by the size of the fluid ounce, 29.5735 mL in US recipes. Check whether a recipe means US, label or UK ounces, and keep fluid ounces apart from ounces of weight. For recipes to measure out, see the TheSawad cookbooks.