Ounces to Milliliters Converter (fl oz to mL)
Enter a volume in fluid ounces and get the exact milliliter equivalent. Choose between US fluid ounces (29.5735 mL each) and UK Imperial fluid ounces (28.4131 mL each), or flip the conversion to go from milliliters back to ounces. Results update as you type, with a step-by-step breakdown and a reference table for the most common kitchen and beverage measurements.
How to convert fluid ounces to milliliters
Multiply the number of fluid ounces by the conversion factor for your ounce type. For US fluid ounces, that factor is exactly 29.5735295625 mL per fl oz; for UK/Imperial fluid ounces, it is 28.4130625 mL per fl oz. For example, 8 US fl oz equals 8 x 29.5735 = 236.59 mL, which is exactly one US cup. In reverse, divide the milliliter value by the same factor: 500 mL divided by 29.5735 gives roughly 16.91 US fl oz.
US fluid ounces vs UK fluid ounces
The US fluid ounce and the UK (Imperial) fluid ounce share a name but are different units. One US fluid ounce is 29.5735 mL, defined as exactly 1/128 of a US liquid gallon. One UK fluid ounce is 28.4131 mL, defined as exactly 1/160 of an Imperial gallon. The difference is about 4 percent, so switching between them on a larger volume (say, 32 fl oz) produces a gap of more than 36 mL. US ounces are used in American recipes, nutritional labels, and most bar measurements worldwide. UK ounces appear in British recipes and some Commonwealth standards. When in doubt about which definition a recipe uses, check whether the recipe also lists metric weights or uses UK cup sizes (284 mL vs the US 237 mL).
Milliliter to fluid ounce reverse conversion
To convert milliliters to fluid ounces, divide the mL value by the conversion factor. For US fl oz: fl oz = mL / 29.5735. For UK fl oz: fl oz = mL / 28.4131. Common reference points: 100 mL is about 3.38 US fl oz; 250 mL (a standard metric cup) is about 8.45 US fl oz; 1,000 mL (one liter) is about 33.81 US fl oz. Switch the Convert direction in the calculator above to enter milliliters directly.
Kitchen equivalents and practical tips
In US cooking, the fluid-ounce system nests cleanly: 1 US cup = 8 fl oz, 1 pint = 16 fl oz, 1 quart = 32 fl oz, 1 gallon = 128 fl oz. Milliliter-based measuring is generally more precise for baking because a 5 mL teaspoon and 15 mL tablespoon are exact round numbers. When converting a US recipe to metric, multiply every fl oz measurement by 29.57 and round to the nearest 5 mL for practical accuracy. Most kitchen scales and digital measuring cups can display both units, making direct measurement the best approach for precision work.
Common ounce-to-mL conversions
| Volume (US fl oz) | Milliliters (mL) | Common name |
|---|---|---|
| 0.5 | 14.79 | 1 US tablespoon |
| 1 | 29.57 | 1 US fl oz / shot |
| 2 | 59.15 | 2 US fl oz |
| 4 | 118.29 | Small juice glass |
| 6 | 177.44 | Juice serving |
| 8 | 236.59 | 1 US cup |
| 10 | 295.74 | 10 US fl oz |
| 12 | 354.88 | Standard soda can |
| 16 | 473.18 | 1 US pint |
| 32 | 946.35 | 1 US quart |
| 64 | 1,892.71 | 1 US half-gallon |
| 128 | 3,785.41 | 1 US gallon |
US fluid ounce values (1 US fl oz = 29.5735 mL) for common kitchen and beverage measurements.
Frequently asked questions
How many mL is 1 fluid ounce?
One US fluid ounce equals exactly 29.5735 mL (often rounded to 29.57 mL or 30 mL on nutrition labels). One UK/Imperial fluid ounce equals exactly 28.4131 mL. Unless a recipe specifies otherwise, most online references mean the US definition.
How many fluid ounces is 100 mL?
100 mL equals approximately 3.3814 US fluid ounces, or 3.5195 UK/Imperial fluid ounces. The difference arises because the US and UK fluid ounce use different reference gallons.
Is 8 fl oz the same as 1 cup?
Yes, in US measurements exactly. One US cup is defined as 8 US fluid ounces, which equals 236.588 mL. Note that a UK/metric cup is 250 mL (about 8.45 US fl oz), so UK recipes calling for "1 cup" may intend a slightly larger volume.
Why does the nutrition label say 1 fl oz = 30 mL?
US nutrition labeling regulations (21 CFR 101.9) round 1 fluid ounce to 30 mL for simplicity. The precise value is 29.5735 mL. For food science or formula work use the full factor; for everyday cooking the 30 mL approximation is close enough.
What is the difference between a fluid ounce and a dry ounce?
A fluid ounce measures volume (how much space a liquid occupies). A dry ounce measures mass (weight), equal to about 28.35 grams. They are different things: 1 fl oz of water weighs roughly 29.57 grams, but 1 fl oz of a denser liquid like honey weighs considerably more. Never use them interchangeably.