Convert ml to fl oz millilitres ↔ US fluid ounces Free Online Secure
Type a value in millilitres and read it in US fluid ounces at once. The factor is exact by definition, the arithmetic happens in your browser, and nothing is sent anywhere.
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Convert to US fluid ounces
Common values — Convert ml to fl oz (millilitres ↔ US fluid ounces)
| ml | fl oz |
|---|---|
| 1 | 0.0338140227018 |
| 2 | 0.0676280454037 |
| 3 | 0.101442068106 |
| 5 | 0.169070113509 |
| 10 | 0.338140227018 |
| 20 | 0.676280454037 |
| 50 | 1.69070113509 |
| 100 | 3.38140227018 |
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 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 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 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.
Per 100 ml or per serving: reading European drink labels in American ounces
A carton of orange juice from Spain says 45 kilocalories per 100 millilitres, while the American label next to it gives calories per 8 fluid ounce serving. To compare them you must first convert ml to fl oz: multiply by 0.033814. A serving of 8 ounces is 237 ml, so the Spanish juice has 107 kcal per serving, and a 12 ounce can of cola of 355 ml carries 149. This page multiplies as you type, and the text below shows how to turn per 100 ml figures into American servings, with sugar, caffeine and calories for common drinks.
The page covers the rule with examples, a note on each unit, a comparison, a tour of drink labels and the slips to avoid. All arithmetic happens in your browser; nothing you enter is sent anywhere. Nutrition values are examples, so always read the actual label.
How to convert ml to fl oz: multiply by 0.033814
The rule
One millilitre is 0.0338140227 US fluid ounces, since an ounce is 29.5735 ml. To convert ml to fl oz, multiply the millilitres by 0.0338, or divide by 29.57. So 100 ml is 3.38 oz, 250 ml is 8.45 oz, 355 ml is 12.0 oz and 500 ml is 16.9 oz. In the other direction, multiply ounces by 29.57.
Worked examples
A glass of 200 ml holds 6.8 ounces. A can of 330 ml holds 11.2 ounces, a bottle of 750 ml 25.4. A cup of 237 ml is exactly 8 ounces. For a quick figure divide by 30 and add a little.
Why not 0.035
The figure 0.035 is the number of ounces of weight in a gram. A fluid ounce measures volume, and the factor for millilitres is 0.0338. Using 0.035 overstates the volume by nearly 4 percent.
A quick sanity check
The ounce is the larger unit, so the number shrinks by about thirty times. If your “convert ml to fl oz” calculation result shrank by 8 or 16 times, you used the cup or pint factor.
The millilitre
A thousandth of a litre
The millilitre is the basis of European nutrition labels, which state energy, sugar, fat and salt per 100 ml for liquids and per 100 g for solids, so that products of different sizes can be compared.
Where it appears
European labels, recipes, bottles and cartons.
The fluid ounce
29.57 millilitres
American nutrition labels state values per serving, and the serving of a drink is usually 8, 12 or 16 fluid ounces. The size of the serving is chosen by the producer from a table of reference amounts, not by the container.
Where it appears
US labels, menus, cans and bottles.
Millilitre and fluid ounce compared
An ounce holds nearly 30 millilitres. A European 100 ml basis is therefore 3.4 ounces, less than half of a US serving of 8 ounces. Values per 100 ml must be multiplied by 2.37 to give the amount in an 8 ounce serving. A label that looks lower in calories because of the smaller basis may be the same once you convert ml to fl oz and express both in the same volume.
The factor is not round, so estimates are approximate: divide by 30 and add 1.5 percent. For exact work use 0.0338140227.
Where the conversion appears
Calories per serving
Orange juice with 45 kcal per 100 ml has 107 kcal in 8 ounces, 237 ml. Whole milk at 64 kcal per 100 ml has 152 kcal. Skimmed milk at 34 has 81. Cola at 42 has 149 in a 12 ounce can, 355 ml. When you convert ml to fl oz for a drink, you can set European figures beside the calories printed on an American can.
Sugar
Cola carries about 10.6 g of sugar per 100 ml, so a 12 ounce can has 37.6 g and a half-litre bottle 53 g. Orange juice has 8.4 g per 100 ml, so 8 ounces contain 20 g, around five teaspoons. Health guidance on added sugar is given in grams a day, so the conversion shows how quickly a drink uses up the allowance.
Caffeine
An energy drink with 32 mg per 100 ml has 80 mg in a 250 ml can, 8.4 ounces. Coffee at roughly 40 mg per 100 ml gives 95 mg in 8 ounces. Tea gives about 20 mg per 100 ml, 47 mg per cup. The numbers are averages and vary by product and brew strength.
Reference amounts and servings
US labelling uses reference amounts per eating occasion. For beverages, the reference is 8 fluid ounces, 240 ml, and the serving on the label is based on it. A 20 ounce bottle that is a single serving in practice may have to be labelled as such if people usually drink it at once. European labels leave the portion to the reader and give 100 ml, which is why conversion is needed.
In a spreadsheet
Put millilitres in column A and use =A2*0.0338140227 in column B. For the reverse, =B2/0.0338140227. A column for calories per 100 ml and a formula =cal_per_100*A2/100 gives calories per container. Format with one decimal, and keep the source column so a comparison can be checked.
Rounding on labels
US labels round calories to the nearest 5 or 10 and sugar to the nearest gram, so 106.7 kcal appears as 105 or 110, and 37.6 g as 38. European labels round differently. A comparison with two decimal places is false precision. Round at the end of the calculation and judge differences below five percent as equal.
A mental shortcut
Divide millilitres by 30 and add 1.5 percent: 250 ml is 8.3 plus 0.1, 8.4 ounces. For per 100 ml figures, multiply by 2.4 to get the amount in 8 ounces: 45 kcal becomes 108. The multiplier works for calories, sugar and caffeine alike, and takes seconds in the supermarket aisle.
Reference values
30 ml is 1.0 oz, 100 ml is 3.4 oz, 200 ml is 6.8 oz, 250 ml is 8.5 oz, 330 ml is 11.2 oz, 355 ml is 12.0 oz, 500 ml is 16.9 oz, 750 ml is 25.4 oz and 1,000 ml is 33.8 oz. If you convert ml to fl oz and land far from this ladder, repeat the multiplication.
Checking by reversing
To make sure your “convert ml to fl oz” calculation result is right, multiply it by 29.57. If 250 ml gave 8.45 oz, then 8.45 times 29.57 returns 250. A second check is the size of the answer: it should be nearly thirty times smaller. If it is 8 times smaller, you used the cup factor.
Sports drinks and electrolytes
A sports drink with 46 mg of sodium per 100 ml has about 109 mg in 8 ounces, 237 ml, and 163 mg in a 12 ounce bottle. Carbohydrate at 6 g per 100 ml gives 14 g per cup, 21 g in 12 ounces. Athletes comparing a European isotonic drink with an American one find that the figures match closely once the volumes are made equal, and the first step is to convert ml to fl oz.
Beer and wine nutrition
A beer of 43 kcal per 100 ml has 153 kcal in a 12 ounce can, 355 ml. A wine of 85 kcal per 100 ml has 126 kcal in a 5 ounce glass, 148 ml, and 640 kcal in a bottle of 750 ml. Alcohol makes up most of the energy, and the labels in each system round the figures in different ways, so differences of a few kilocalories mean little.
Infant formula and baby drinks
Ready-to-feed formula supplies about 67 kcal per 100 ml, 20 kcal per ounce, the figure used on American packaging. A 4 ounce bottle, 118 ml, gives 80 kcal, an 8 ounce bottle 160. A European label's 67 kcal per 100 ml gives the same answer. Feeding amounts are advised by a health professional or by the pack, and the conversion only helps to read a label.
Fresh juices and smoothies
A fresh orange juice of 250 ml, 8.45 ounces, has 112 kcal and 21 g of sugar, a smoothie of 330 ml, 11.2 ounces, may carry 200 kcal and 35 g. Juice bars give sizes in ounces, and nutrition websites in millilitres, so it is convenient to know that a 16 ounce drink, 473 ml, has nearly twice the values of a 250 ml one.
Shopping across countries
A shopper moving from Europe to the United States will notice that milk comes by the gallon, juice in 52 or 64 ounce cartons and water in 16.9 ounce bottles. A litre of milk, 33.8 ounces, costs the same per unit as a quarter of a US gallon, 32 ounces. Learning the equivalents, 1 litre is a little over a quart, is the best defence against confusing unit prices.
Alcohol content and units
Beer at 5 percent by volume has 5 ml of alcohol per 100 ml. A 12 ounce can, 355 ml, has 17.8 ml, 14 g, one US standard drink. A glass of wine of 5 ounces, 148 ml, at 12 percent has the same. A European label gives percent by volume, an American one the percentage, and the number of standard drinks can be worked out from the volume in ounces.
Yoghurt drinks and kefir
A drinking yoghurt of 330 ml, 11.2 ounces, with 70 kcal per 100 ml, has 231 kcal in the bottle, and a kefir of 250 ml, 8.45 ounces, at 55 kcal per 100 ml has 138. American versions are sold in 7 to 32 ounce bottles with the numbers per cup. A conversion shows that a European bottle is about one and a half US servings.
Coconut water and plant drinks
Coconut water has about 19 kcal per 100 ml and 3.7 g of sugar, so a carton of 330 ml, 11.2 ounces, holds 63 kcal and 12 g of sugar. A cup, 8 ounces, has 45 kcal. Brands that sell on both sides of the Atlantic print the per 100 ml values for Europe and per serving for the United States, so the factor 2.4 links the two lines on the label.
Sodium and minerals in water
Mineral water labels list minerals in milligrams per litre. A water with 50 mg of sodium per litre has 0.05 mg per ml, 11.8 mg in 8 ounces, 237 ml. Calcium at 300 mg per litre gives 71 mg per cup. The numbers per serving make it easier to compare with American labels, which give them as a percentage of the daily value.
Protein shakes and milk drinks
A protein drink of 330 ml with 25 g of protein has 7.6 g per 100 ml. In a 12 ounce serving, 355 ml, a US bottle might show 27 g. A glass of milk at 3.4 g of protein per 100 ml gives 8 g in 8 ounces. When you convert ml to fl oz for a European shake, check the per-serving figure on an American one, and compare protein per ounce.
Energy drinks and mixers
Energy drinks come in cans of 250 ml, 8.4 ounces, in Europe and 8.4, 12, 16 and 24 ounces in the United States. A 16 ounce can, 473 ml, holds nearly twice the caffeine of a 250 ml can. Guidance for adults sets a daily limit of 400 mg of caffeine, so the volume and concentration matter. A conversion helps find out how many cans that is.
Milk alternatives
Oat, almond and soy drinks list values per 100 ml in Europe and per cup in the United States. An oat drink with 45 kcal per 100 ml has 107 kcal per cup. A soy drink with 3.3 g of protein per 100 ml has 7.8 g per cup. Comparing brands from both sides needs the factor 2.37, which is the number of 100 ml in a cup.
Syrups and concentrates
A squash concentrate diluted 1 to 4 turns 50 ml into 250 ml, 8.5 ounces. The label may give values per 100 ml of the diluted drink or of the concentrate. A 1 litre bottle of concentrate, 33.8 ounces, makes 5 litres, 169 ounces, or 21 cups. Dilution instructions are the same in either system, but the conversion tells you how many servings a bottle makes.
Soups and sauces
A ready soup of 400 ml, 13.5 ounces, 1.7 cups, with 40 kcal per 100 ml, has 160 kcal in the can. A sauce of 350 ml, 11.8 ounces, with 90 kcal per 100 ml has 315 kcal in the jar. Servings are defined by the label in the United States, often half a cup, 4 ounces, so the number per container follows from dividing.
Oils and fats
Olive oil is about 800 kcal per 100 ml, which gives 120 kcal per tablespoon, 15 ml, and 1,900 kcal in 8 ounces. A bottle of 500 ml, 16.9 ounces, holds 4,000 kcal. Oils are labelled by volume in one system and weight in another, and with a density of 0.91 the conversion between them needs a factor beyond the volume one.
More values for convert ml to fl oz
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 ml = 0.0033814 fl oz
- 0.5 ml = 0.016907 fl oz
- 3 ml = 0.101442 fl oz
- 4 ml = 0.135256 fl oz
- 7 ml = 0.236698 fl oz
- 15 ml = 0.50721 fl oz
- 20 ml = 0.67628 fl oz
- 75 ml = 2.53605 fl oz
- 200 ml = 6.7628 fl oz
- 500 ml = 16.907 fl oz
- 2,000 ml = 67.628 fl oz
- 10,000 ml = 338.14 fl oz
Mistakes when you convert ml to fl oz
Comparing per 100 ml with per serving
Values per 100 ml and per 8 ounces differ by a factor of 2.37. Compare them on the same basis.
Using weight ounces
A fluid ounce is 29.57 ml, an ounce of weight 28.35 g. Use the fluid one for drinks.
Multiplying by 29.57
That goes from ounces to millilitres. To go from millilitres to ounces, multiply by 0.0338.
Short answers
What is 1 millilitre in fluid ounces?
0.0338 fluid ounces.
How do I convert ml to fl oz?
Multiply by 0.0338.
What is 1 fluid ounce in millilitres?
29.57 millilitres.
What does 250 ml come to in fluid ounces?
8.45 oz.
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 ml to tsp, Convert ml to cm³, Convert cups to fl oz, Convert L to fl oz, Convert fl oz to cups, Convert km to mi, Convert mi to km, Convert °C to °F, Convert °F to °C. To go the other way, use Convert fl oz to ml.
To recap: you convert ml to fl oz by multiplying by 0.0338 and you write the unit beside the result. Everything is computed locally, with no account and no upload.