100 ml is 0.42 US cups — a little less than half a cup. The conversion is exact arithmetic: 1 US cup is 236.6 ml, and 100 divided by 236.6 is 0.42. In kitchen terms, 100 ml is 6.76 tablespoons, or just under 7 tablespoons, which is the more useful figure — nobody measures 0.42 cups in a cup measure, because the markings are too coarse. Use tablespoons for 100 ml: 6 tablespoons plus 2 teaspoons is 100 ml near enough, and it is far easier to measure accurately than trying to eyeball 0.42 of a cup.
The 100 ml figure comes up in dressings, sauces, small amounts of stock, and recipes that scale down to one or two servings. It is also the standard size for a small bottle of cream or a single portion of sauce. The conversion matters because recipes written in millilitres and measuring equipment marked in cups are a daily mismatch in many kitchens, and 100 ml is small enough that a rounding error matters: rounding 0.42 cups up to 1/2 cup adds 18 ml, which is nearly a fifth more liquid, and in a dressing or a sauce that is enough to change the balance.
Millilitres to cups conversion table
The table below shows the common millilitre amounts and their US cup equivalents, with tablespoons and teaspoons alongside — the units you will actually use for small amounts like 100 ml.
| Millilitres | US cups | Tablespoons | Teaspoons | Fluid ounces |
|---|---|---|---|---|
| 50 ml | 0.21 cups | 3.38 tbsp | 10.14 tsp | 1.69 fl oz |
| 100 ml | 0.42 cups | 6.76 tbsp | 20.29 tsp | 3.38 fl oz |
| 250 ml | 1.06 cups | 16.91 tbsp | 50.72 tsp | 8.45 fl oz |
| 500 ml | 2.11 cups | 33.81 tbsp | 101.44 tsp | 16.91 fl oz |
| 1,000 ml (1 litre) | 4.23 cups | 67.63 tbsp | 202.88 tsp | 33.81 fl oz |
For amounts as small as 100 ml, tablespoons are the practical unit: 100 ml is 6.76 tablespoons. Use 6 tablespoons plus 2 teaspoons for an easy, accurate measure.
Worked examples
A salad dressing for two
A salad dressing for two people uses 100 ml of olive oil, whisked with 2 tablespoons of vinegar, a teaspoon of mustard and a pinch of salt. Measure the oil in tablespoons — 6 tablespoons plus 2 teaspoons — rather than trying to measure 0.42 cups, because a cup measure is too coarse for this amount. Whisk the vinegar and mustard together first, then add the oil in a slow stream while whisking, so the dressing emulsifies instead of separating. The dressing serves two generously, and any leftover keeps for a day in the fridge if you whisk it again before using.
A small pan sauce for one steak
A pan sauce for one steak uses 100 ml of stock, deglazed in the pan after the steak has rested. Pour the stock into the hot pan and scrape up the browned bits from the bottom — that is where the flavour is — then add a knob of butter and let the sauce reduce for two minutes until it coats a spoon. Measure the stock in a small jug or in tablespoons: 6 tablespoons plus 2 teaspoons. If you pour in half a cup instead, you will have 118 ml, which is nearly a fifth too much, and the sauce will be thin and take longer to reduce.
Scaling a recipe down for one person
A recipe for four people calls for 400 ml of sauce, and you are cooking for one. A quarter of 400 ml is 100 ml, which is 0.42 cups — or 6 tablespoons plus 2 teaspoons. Measure it in tablespoons and you will get the scaling right; measure it as half a cup and you will have 18 ml too much, which is enough to make a single serving noticeably wetter. Scaling down is where small conversions matter most, because the rounding error is a larger fraction of the total.
How the figure is worked out
Think of the answer as a conversion, not a measurement. The package weight is 100 millilitres. One cup of this ingredient weighs a known number of grams, so the cups in the package are the package weight divided by the cup weight. The method matters as much as the number: a spooned and levelled cup is the standard, and a scooped cup packs in more, which is why two bakers can get different cup counts from the same bag.
Practical guidance
For 100 ml, use tablespoons, not cups. A cup measure is designed for amounts of 1/4 cup and above, and 0.42 cups falls between the 1/3 and 1/2 cup markings, which makes it hard to read accurately. Tablespoons are precise: 6 tablespoons is 89 ml, and 2 teaspoons adds another 10 ml, giving 99 ml — a single millilitre short, which is exact enough for any recipe. If you have a small measuring jug with millilitre markings, use that instead: pour to the 100 ml line, read at eye level, and you are done.
Be careful with rounding. It is tempting to call 100 ml half a cup, but half a cup is 118 ml — 18 ml more, which is nearly a fifth extra. In a soup, that does not matter. In a dressing, a sauce, or a scaled-down recipe, it does. The other common mistake is to call 100 ml a third of a cup: a third of a cup is 79 ml, which is 21 ml short. Neither rounding is safe for a precise recipe. Use the tablespoon conversion — 6 tablespoons plus 2 teaspoons — and you will be within a millilitre.
Frequently asked questions
Is 100 ml the same as half a cup?
No. Half a US cup is 118 ml, which is 18 ml more than 100 ml — nearly a fifth extra. In a soup the difference does not matter, but in a dressing or a sauce it does. Measure 100 ml as 6 tablespoons plus 2 teaspoons instead.
How many tablespoons are in 100 ml?
6.76 tablespoons. One tablespoon is 14.79 ml, and 100 divided by 14.79 is 6.76. In practice, use 6 tablespoons plus 2 teaspoons, which is 99 ml — a single millilitre short, and exact enough for any recipe.
How many teaspoons are in 100 ml?
20.29 teaspoons. One teaspoon is 4.93 ml, and 100 divided by 4.93 is 20.29. Nobody measures 100 ml in teaspoons — use tablespoons, or a small jug with millilitre markings.
How many fluid ounces are in 100 ml?
3.38 fluid ounces. One fluid ounce is 29.57 ml, and 100 divided by 29.57 is 3.38. A 100 ml bottle is just under a third of a cup, and just over 3 fluid ounces.
Why do recipes use millilitres instead of cups?
Because millilitres are more precise, especially for small amounts. A recipe that calls for 100 ml is telling you exactly how much liquid to use, while a recipe that calls for 0.42 cups is awkward and hard to measure. Metric recipes are common in European cookbooks, and the millilitre figures are worth learning if you cook from them often.