ML to OZ Converter
ConversionsEnter milliliters or fluid ounces and pick the kind of ounce: US, UK (imperial) or the 30 mL ounce on US nutrition labels. You get the exact result, US cups and spoons, and two charts of common amounts below.
Step by step
500 / 29.5735295625 = 16.907
- One US fl oz is 29.5735295625 mL, so divide the milliliters by it: 500 / 29.5735295625 = 16.907 fluid ounces.
- In US kitchen measures the same volume is 2.113 cups, 33.81 tablespoons or 101.44 teaspoons.
Once every entry is valid, you’ll see each step of the calculation here.
Formula
- fl oz
- volume in fluid ounces
- mL
- volume in milliliters, one thousandth of a liter or one cubic centimeter
- mL per fl oz
- size of one fluid ounce in milliliters for the kind of ounce you picked
How it works
A US fluid ounce is exactly 29.5735295625 mL. It comes from the US gallon, which is defined as 231 cubic inches (3,785.411784 mL) and holds 128 fluid ounces. To convert milliliters to ounces, divide by 29.5735295625. To go back, multiply. A 500 mL bottle holds 16.907 fl oz, and 8 fl oz is 236.588 mL. For a quick estimate in your head, divide the milliliters by 30: 300 mL is about 10 ounces (10.144 by the exact factor).
Three kinds of ounce are in everyday use. The UK (imperial) fluid ounce is exactly 28.4130625 mL, about 4% smaller than the US one, because the imperial gallon is 4.54609 liters and holds 160 ounces. US nutrition labels use a rounded ounce: federal labeling rules treat 1 fl oz as 30 mL and a cup as 240 mL, which is why a carton lists 8 fl oz as 240 mL. Pick the kind above to match your recipe, bottle or label.
Fluid ounces measure volume, not weight. A fluid ounce of water weighs about 1.04 ounces on a scale, and honey or oil weigh differently again, so do not read a kitchen scale in fluid ounces. In US recipes a cup is 8 fl oz, a tablespoon is half an ounce (14.787 mL) and a teaspoon is a sixth of an ounce (4.929 mL); the converter shows your volume in those measures as well. For gallons and liters see the gallons to liters converter.
The formula
Both factors are exact by definition; only the displayed result is rounded. The US ounce is 231 × 16.387064 mL / 128, because an inch is exactly 2.54 cm. The UK ounce is 4,546.09 mL / 160. The label ounce of 30 mL is a legal rounding for nutrition facts panels and is not a measured size.
Cups and spoons come from the US ounce: 1 cup = 8 fl oz = 236.5882365 mL, 1 tablespoon = 0.5 fl oz and 1 teaspoon = 1/6 fl oz. US labeling rounds those to 240 mL, 15 mL and 5 mL, so a recipe that follows labels can differ from the exact value by about 1.4%.
Example
How many ounces is a 500 mL bottle of water?
- Divide by the 29.5735295625 mL in one US fluid ounce: 500 / 29.5735295625 = 16.907 fl oz.
- The bottle holds about 16.9 fl oz, a little more than a 16 fl oz pint, which is 473.18 mL.
500 mL = 16.907 US fl oz, which is 2.113 US cups.
Load this example into the calculatorFrequently asked questions
How many ml in an oz?
One US fluid ounce is 29.5735 mL (exactly 29.5735295625). One UK fluid ounce is 28.4131 mL. So 2 oz are 59.15 mL, 4 oz are 118.29 mL, 8 oz are 236.59 mL and 16 oz are 473.18 mL in US ounces.
Is 1 oz equal to 30 mL?
Almost, but not exactly. A US fluid ounce is 29.5735 mL, which rounds to about 30 mL. US nutrition labels use exactly 30 mL per fluid ounce (21 CFR 101.9), so 8 fl oz shows as 240 mL. A UK fluid ounce is 28.4131 mL.
How many ounces is 350 ml, 300 ml or 320 ml?
In US fluid ounces, 350 mL is 11.83 oz, 300 mL is 10.14 oz and 320 mL is 10.82 oz. In UK ounces they are 12.32, 10.56 and 11.26. To convert any amount, divide the milliliters by 29.5735 (US) or 28.4131 (UK). For a quick estimate, divide by 30.
How much is 30 ml, 100 ml or 500 ml in ounces?
30 mL is 1.01 US fl oz, 100 mL is 3.38 oz and 500 mL is 16.91 oz. In UK fluid ounces they are 1.06, 3.52 and 17.60. A 750 mL wine bottle holds 25.36 US ounces.
Is 750 mL the same as 16 oz?
No, they are not the same. 750 mL, the standard wine bottle, is 25.36 US fl oz. 16 fl oz is a US pint, which is 473.18 mL. In UK ounces 750 mL is 26.40.
Is 100 mL 8 oz? Is 50 mL 2 fl oz?
No to both. 100 mL is 3.38 fl oz, while 8 fl oz (one US cup) is 236.59 mL. 50 mL is 1.69 fl oz, while 2 fl oz is 59.15 mL, so 50 mL is not the same as 2 oz.
How many fluid ounces (US) are in one milliliter?
One milliliter is 0.033814 US fluid ounces, and 1 liter is 33.814 fl oz. In UK ounces one milliliter is 0.035195 fl oz.
How do I convert fluid ounces (US) back to milliliters?
Multiply the ounces by 29.5735295625. 12 fl oz, a soda can, are 354.88 mL; 20 fl oz are 591.47 mL; 40 fl oz are 1,182.94 mL. Pick UK in the converter to use 28.4130625 instead.
What is a milliliter?
A milliliter (mL) is one thousandth of a liter, which equals one cubic centimeter. It is the metric unit for small volumes such as medicine doses, bottles of water and recipe liquids.
What is a fluid ounce?
A fluid ounce (fl oz) is a customary unit of volume: 1/128 of a US gallon or 1/160 of an imperial gallon. It is different from the ounce of weight (oz) used on scales, which is 28.35 grams.
- NIST Guide to the SI, Appendix B: Conversion Factors (National Institute of Standards and Technology)
- Approximate Conversions from U.S. Customary Measures to Metric (National Institute of Standards and Technology)
- 21 CFR 101.9, Nutrition labeling of food (serving size units) (Legal Information Institute, Cornell Law School)
- Weights and Measures Act 1985, Schedule 1 (imperial gallon) (legislation.gov.uk)
- Fluid ounce (Wikipedia)