Convert fl oz to ml US fluid ounces ↔ millilitres Free Online Secure
Type a value in US fluid ounces and read it in millilitres at once. The factor is exact by definition, the arithmetic happens in your browser, and nothing is sent anywhere.
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Convert from US fluid ounces
Convert to millilitres
Common values — Convert fl oz to ml (US fluid ounces ↔ millilitres)
| fl oz | ml |
|---|---|
| 1 | 29.5735295625 |
| 2 | 59.147059125 |
| 3 | 88.7205886875 |
| 5 | 147.8676478125 |
| 10 | 295.735295625 |
| 20 | 591.47059125 |
| 50 | 1478.676478125 |
| 100 | 2957.35295625 |
Where these units come from
The litre has an awkward history. From 1901 it was defined as the volume of one kilogram of pure water at its densest, which sounds elegant but came out at 1.000028 cubic decimetres — close enough to be confusing and far enough to spoil careful work. In 1964 the definition was abandoned and the litre became exactly one cubic decimetre, which it has been ever since. The gallon has a messier story still: the US gallon descends from the English wine gallon of 231 cubic inches, while Britain redefined its own in 1824 as the volume of ten pounds of water. Nobody reconciled the two, so a US gallon is 3.785411784 litres and an imperial gallon 4.54609 — about a fifth larger. The gallon, pint, cup, fluid ounce and spoons on this page are the US ones.
Where you meet them
Millilitres and litres run through daily life almost invisibly: bottles, fuel, paint, dosage, the capacity of a kettle. Cubic metres belong to water bills, concrete, shipping and the air a ventilation system has to move. Cubic centimetres name engine displacement, cubic feet appear in freight and in appliance capacities, and cups and spoons live almost entirely in recipes — which is exactly where the difference between a US cup and a metric one quietly ruins a cake.
Questions people ask
Is a fluid ounce a measure of weight?
No, it is a measure of volume, even though ounce also names a weight. A US fluid ounce is 29.5735 millilitres; the imperial one is slightly smaller, at 28.4131. The shared name is a historical accident, and for water the two roughly match, since a fluid ounce of water weighs close to an ounce.
Is a millilitre the same as a cubic centimetre?
Yes, exactly. Since 1964 the litre has been defined as one cubic decimetre, so a millilitre is exactly one cubic centimetre. Before that the litre was very slightly larger, by about 28 parts in a million, which is why very old tables show a tiny difference. Today you can swap them freely.
Is the answer exact?
Where both units are defined in terms of one another by whole numbers, yes — the page says so above the figure, and the only rounding is in how many digits are shown. Where the ratio has no finite decimal, the page shows twelve significant digits and says the relation is approximate rather than pretending otherwise.
Does anything I type leave my device?
No. The arithmetic runs in your browser; nothing is uploaded and there is no server to upload it to. Load the page once and it keeps working with the network switched off.
From a single espresso to a trenta: coffee shop sizes in millilitres
In an American coffee shop you order a drink by its size in fluid ounces, 8, 12, 16, 20 or more, while a European café writes its sizes in millilitres. To compare a 12 ounce latte with a 200 ml cup in Rome, you need to convert fl oz to ml. Multiply by 29.5735: an ounce is 29.6 ml, a 12 ounce drink 355 ml, a 16 ounce one 473 ml. This page multiplies as you type, and the text below goes round the coffee bar, from the espresso shot to the biggest iced drinks, with prices and brewing ratios along the way.
The page covers the rule with examples, a note on each unit, a comparison, a tour of coffee drinks and the slips to avoid. All arithmetic happens in your browser; nothing you enter is sent anywhere.
How to convert fl oz to ml: multiply by 29.5735
The rule
One US fluid ounce is exactly 29.5735295625 millilitres. To convert fl oz to ml, multiply the ounces by 29.57, or by 30 for a quick figure. So 1 oz is 29.6 ml, 2 oz is 59.1 ml, 8 oz is 236.6 ml, 12 oz is 354.9 ml and 16 oz is 473.2 ml. In the other direction, divide millilitres by 29.57.
Worked examples
A single espresso of 1 ounce is 30 ml. A cortado of 4 ounces is 118 ml. A latte of 12 ounces is 355 ml. A large iced coffee of 24 ounces is 710 ml. For a quick figure, multiply by 30 and take off 1.5 percent: 20 ounces is 600 less 9, 591 ml.
Why not 28.35
The number 28.35 is the number of grams in an ounce of weight. A fluid ounce is a volume, 29.57 ml. Mixing them up gives an error of about 4 percent, which could make a latte look smaller than it is.
A quick sanity check
The millilitre is the smaller unit, so the number grows by nearly 30 times. If your “convert fl oz to ml” calculation result grew only 8 or 16 times, you used the cup or pint factor.
The fluid ounce
A sixteenth of a pint
The US fluid ounce is 29.57 millilitres, two tablespoons. Coffee shops, juice bars and soda fountains define their cup sizes by it, and every American drink label gives volume in it.
Where it appears
Coffee cups, cans, bottles and cosmetics.
The millilitre
A thousandth of a litre
The millilitre is used for coffee drinks in Europe and most of the world. A café lists an espresso as 25 to 30 ml, a cappuccino as 150 to 200 and a large latte as 300 to 400.
Where it appears
Menus, machine settings, recipes and labels.
Fluid ounce and millilitre compared
A fluid ounce holds almost 30 millilitres. An American small, 12 ounces, 355 ml, is bigger than many European large drinks. Visitors who say they are used to a medium latte are in for a surprise on the continent, where 200 ml is normal. The factor reveals how much coffee you are really getting.
The factor is not round, so estimates are approximate: multiply by 30 and take off 1.5 percent. For exact work use 29.5735295625.
Where the conversion appears
Espresso drinks
A single shot is about 1 ounce, 30 ml, and a double 2 ounces, 59 ml. A demitasse cup holds 3 ounces, 89 ml. A cortado is 4 ounces, 118 ml. A flat white is 5 to 6 ounces, 148 to 177 ml. A cappuccino is 6 to 8 ounces, 177 to 237 ml. When you convert fl oz to ml, you see how small the classic Italian drinks are.
American chain sizes
Typical sizes are short 8 ounces, 237 ml; tall 12, 355 ml; grande 16, 473 ml; venti hot 20, 591 ml; venti cold 24, 710 ml; and the biggest iced size 31 ounces, 917 ml. These match the cup sizes in cups: one, one and a half, two, two and a half, three and almost four. A trenta holds nearly a litre.
Price per ounce and per millilitre
A tall latte of 12 ounces at 4.50 dollars costs 37.5 cents an ounce, 1.27 cents a millilitre. A European café charging 3 euros for 200 ml pays 1.5 cents a millilitre. A small price difference per ounce adds up to a large one over a year of daily coffee, so once you convert fl oz to ml the per-unit comparison is worth making.
How much coffee in a cup
A standard ratio is one part coffee to sixteen parts water by weight. A 12 ounce cup, 355 ml, needs about 22 grams of ground coffee. A 16 ounce cup, 473 ml, needs 30 grams. A double espresso uses 18 grams for 36 ml. Brewing guides give water in ounces or millilitres and coffee in grams or tablespoons, and a conversion helps compare.
Beer and wine tastings
A tasting pour of wine is 2 ounces, 59 ml, and of beer 4 ounces, 118 ml. A flight of four beers is 16 ounces, 473 ml. A bottle of 750 ml gives 12 tasting pours of 2 ounces, 25.4 divided by 2. Tasting rooms plan their stock in ounces per customer, and the metric cousins in millilitres.
Medicine cups
A dosing cup is marked in millilitres and ounces, 30 ml being 1 ounce. A 15 ml tablespoon is half an ounce, 5 ml a sixth. Doses are set by the label or a clinician, and the device supplied should always be used. The conversion is for reading the markings, not for choosing a dose.
Fuel additives and automotive fluids
A bottle of fuel additive of 12 ounces, 355 ml, treats 20 gallons of petrol, 75.7 litres, giving 4.7 ml per litre. A bottle of engine oil additive of 15 ounces is 444 ml. Instructions give ounces per gallon, and the metric user converts both. The ratio per volume of fuel remains the same, so the conversion needs care.
Cosmetics and skin care
A face cream of 1.7 ounces holds 50 ml, a serum of 1 ounce 30 ml, a cleanser of 8 ounces 237 ml. Skin care brands mark both units on the bottle. Comparing the cost per ounce or per ml helps when shopping for different sizes of the same product, and the conversion between them is a fixed factor.
In a spreadsheet
Put ounces in column A and use =A2*29.5735295625 in column B. For the reverse, =B2/29.5735295625. A column for price divided by the millilitres gives price per ml, and times 100 gives per 100 ml for comparison. Format with one decimal place, and keep the source column so you can trace each number.
Rounding
The factor is exact, so rounding is your choice. Menus round to the nearest 5 ml, so 12 ounces, 354.9 ml, may appear as 355. Machines are set to the nearest millilitre. Round at the end of the calculation, and when comparing prices keep two significant figures, which is more than the accuracy of the prices themselves.
A mental shortcut
Multiply by 30 and subtract 1.5 percent: 8 ounces is 240 less 3.6, 236.4 ml. 12 ounces is 360 less 5.4, 354.6. Or simply think of 12 ounces as 355 ml, the can size. The shortcut is accurate to a tenth of a percent, close enough for ordering a drink anywhere in the world.
Reference values
1 oz is 29.6 ml, 2 oz is 59.1 ml, 4 oz is 118 ml, 8 oz is 237 ml, 12 oz is 355 ml, 16 oz is 473 ml, 20 oz is 591 ml, 24 oz is 710 ml and 32 oz is 946 ml. If you convert fl oz to ml and land far from this ladder, repeat the multiplication.
Checking by reversing
To make sure your “convert fl oz to ml” calculation result is right, divide it by 29.57. If 12 oz gave 355 ml, then 355 divided by 29.57 returns 12.0. A second check is the size of the answer: it should be almost thirty times larger. If it is eight times, you used the cup factor.
Craft paints and inks
Acrylic craft paint is sold in 2 ounce bottles, 59 ml, and artist inks in 1 ounce droppers, 30 ml. A set of 12 bottles of 2 ounces holds 24 ounces, 710 ml, as much as a large iced coffee. Craft shops list sizes in ounces, and European suppliers in millilitres, so a hobbyist buying from both has to convert fl oz to ml to compare the price per millilitre of paint.
Milk in a latte
A 12 ounce latte has about 2 ounces of espresso and 8 to 9 ounces of steamed milk, plus foam. Milk expands by 30 to 50 percent when steamed, so 6 ounces, 177 ml, of cold milk becomes 8 to 9 ounces. A shop that pours 200 lattes a day uses about 1,200 ounces of milk, 150 cups, 35 litres, and orders in gallons.
Candle and soap making
Fragrance oil for candles is added at around 1 ounce per pound of wax, but oil is measured by weight on a scale, not in fluid ounces. A bottle of 4 fluid ounces, 118 ml, of oil weighs close to 3.7 ounces. Hobbyists who read American recipes and buy European supplies find ounces of weight and volume mixed together, so the first job is deciding which one the recipe means.
Hot sauce, extracts and condiments
Hot sauce comes in 5 ounce bottles, 148 ml, vanilla extract in 2 and 4 ounce bottles, 59 and 118 ml, and soy sauce in 10 ounce bottles, 296 ml. A teaspoon of vanilla, 5 ml, is a sixth of an ounce, so a 2 ounce bottle holds 12 teaspoons. Baking recipes use teaspoons and the bottles are in ounces, and the ratio is useful for working out how long a bottle lasts.
Sunscreen and travel
Sunscreen is sold in 3 ounce travel bottles, 89 ml, and 8 ounce bottles, 237 ml. Guidance for adults suggests about an ounce, 30 ml, to cover the whole body, so a 3 ounce bottle gives three applications. A conversion to millilitres lets a traveller from Europe judge whether a bottle sold in the United States is the same as the 100 ml they are used to.
Machine tanks and settings
A home espresso machine has a water tank of 50 to 70 ounces, 1.5 to 2 litres. Programmable shots are set in millilitres, 30 or 60 for an espresso, 120 for a lungo. A tank of 2 litres, 67.6 ounces, gives 66 single shots. A machine sold in the United States may show ounces, and a European owner who uses its manual has to convert.
Pour-over and drip
A single pour-over of 12 ounces, 355 ml, takes 22 grams of coffee and about three minutes. A carafe of 32 ounces, 946 ml, needs 59 grams. A drip machine of 60 ounces, 1.77 litres, called 12 cups, needs 110 grams. The machine's cups are 5 ounces, so a 12-cup pot gives 7.5 cups of 8 ounces. A conversion makes the label honest.
Cold brew and iced coffee
Cold brew concentrate is mixed one to one with water or milk. A 16 ounce glass, 473 ml, takes 8 ounces of concentrate, 237 ml, and 8 of water or milk. A bottle of 32 ounces of concentrate, 946 ml, makes 64 ounces of drink, 1.9 litres, or four glasses. A “convert fl oz to ml” calculation step gives the total volume from the concentrate.
Tea and other hot drinks
A tea bag steeps in 8 ounces, 237 ml, of hot water. A teapot of 32 ounces, 946 ml, serves four cups. A hot chocolate of 12 ounces is 355 ml. Cafés that serve tea in pots specify the volume in ounces or millilitres, and a pot for two, 24 ounces, is 710 ml. The conversion lets a traveller know what to expect.
Cups, lids and takeaway sizes
Paper cups come in 4, 8, 12, 16, 20 and 24 ounce sizes, 118, 237, 355, 473, 591 and 710 ml. A 12 ounce cup is not filled to the brim; the working volume is 10 to 11 ounces, 300 to 325 ml. Café owners buy cups by the case and order milk and coffee by the gallon and pound, so a conversion is part of the daily routine.
Syrups and flavourings
Flavour syrups are dosed in pumps of a quarter ounce, 7.4 ml. A grande latte, 16 ounces, takes four pumps, 1 ounce, 30 ml. A bottle of 25.4 ounces, 750 ml, gives about 100 pumps. Baristas count in pumps, and a manager converts the bottle to ounces or millilitres to work out the stock.
Smoothies and juice bars
A smoothie of 16 ounces, 473 ml, is typical, a large one 24 ounces, 710 ml. A juice bar pressing orange juice uses about 3 oranges for 8 ounces, 237 ml. A day of 100 drinks of 16 ounces takes 1,600 ounces, 200 cups, 47 litres, a quantity that drives the supply order.
More values for convert fl oz to ml
A longer list of conversions
If the value you need is not in the first list, these further conversions may be close enough to read off directly:
- 0.1 fl oz = 2.95735295625 ml
- 0.5 fl oz = 14.78676478125 ml
- 3 fl oz = 88.7205886875 ml
- 4 fl oz = 118.29411825 ml
- 7 fl oz = 207.0147069375 ml
- 15 fl oz = 443.6029434375 ml
- 20 fl oz = 591.47059125 ml
- 75 fl oz = 2,218.01 ml
- 200 fl oz = 5,914.7059125 ml
- 500 fl oz = 14,786.76478125 ml
- 2,000 fl oz = 59,147.059125 ml
- 10,000 fl oz = 295,735.295625 ml
Mistakes when you convert fl oz to ml
Mixing fluid ounces with weight ounces
A fluid ounce is 29.57 ml, an ounce of weight 28.35 g. For water they are close, for other liquids not.
Using the cup or pint factor
A cup is 8 ounces and a pint 16. Check that you are converting ounces, not cups.
Dividing instead of multiplying
The millilitre is the smaller unit, so the number grows. If 12 oz became 0.4, you divided.
Short answers
What is 1 fluid ounce in millilitres?
29.57 millilitres.
How do I convert fl oz to ml?
Multiply by 29.57.
What is 1 millilitre in fluid ounces?
0.0338 fluid ounces.
What does 12 oz come to in millilitres?
355 ml.
Does the page send my figure anywhere?
No, everything happens in your browser.
Related tools and a final note
Other volume converters sit nearby: Convert fl oz to cups, Convert fl oz to L, Convert cm³ to ml, Convert tbsp to ml, Convert ml to tsp, Convert km to mi, Convert mi to km, Convert °C to °F, Convert °F to °C. To go the other way, use Convert ml to fl oz.
To recap: you convert fl oz to ml by multiplying by 29.57 and you write the unit beside the result. Everything is computed locally, with no account and no upload.