Converting cups to millilitres should be the easiest job in the kitchen — and for the volume, it is. One US cup is 236.6 ml, full stop, for every ingredient from flour to fruit. The trouble starts when a recipe also needs grams, because a cup of powdered milk does not weigh the same as a cup of anything else. It weighs about 120 g, measured spooned and levelled according to USDA, and that weight is what this page is really about. Below you will find the answer up front, a complete conversion table for every fraction of a cup, three worked examples, the method and source behind the numbers, and practical advice for measuring powdered milk properly. All the figures are labelled approximate, and where it matters we will keep telling you the same thing: verify with a kitchen scale.
How much is 1 cup of powdered milk in millilitres?
1 cup of powdered milk is 236.6 ml and weighs about 120 g. The millilitre figure is exact, because a US cup is defined as 236.6 ml: fill any cup measure to the brim with any ingredient and you have 236.6 ml of it. The gram figure is approximate, because it depends on the density of powdered milk and on how the cup was filled. The value we use, 120 g, comes from USDA, measured spooned and levelled, and we use it with medium confidence. If you are baking, scaling a recipe, or cooking for someone with a dietary restriction, weigh the powdered milk on a kitchen scale and use the gram figure — it is the only measurement that does not depend on how fluffy, damp or tightly packed the ingredient happens to be today.
That distinction between exact volume and approximate weight is the single most useful thing to understand about cup conversions. Recipes written in cups assume a standard cup and a standard technique, and when either of those assumptions breaks, the recipe breaks with it. A cup of powdered milk scooped straight from the bag can weigh noticeably more than a cup spooned in gently, and the difference is invisible until the finished dish tells you about it. The table below gives you both figures for every amount you are likely to need, so you can convert in either direction without doing the arithmetic yourself.
Cups to millilitres table for powdered milk
| Cups | Millilitres | Grams (approx.) |
|---|---|---|
| ¼ cup | 59.2 ml | 30 g |
| ⅓ cup | 78.9 ml | 40 g |
| ½ cup | 118.3 ml | 60 g |
| ⅔ cup | 157.7 ml | 80 g |
| ¾ cup | 177.5 ml | 90 g |
| 1 cup | 236.6 ml | 120 g |
| 2 cups | 473.2 ml | 240 g |
| 3 cups | 709.8 ml | 360 g |
| 4 cups | 946.4 ml | 480 g |
Every row in this table follows the same two rules. The millilitre column is the cup fraction multiplied by 236.6 ml, so a quarter cup is 59.2 ml, a third of a cup is 78.9 ml, half a cup is 118.3 ml, two-thirds is 157.7 ml, and three-quarters is 177.5 ml. Those numbers are exact to one decimal place and they are the same for every ingredient on this site. The gram column is the same fraction multiplied by 120 g, the weight of a full cup of powdered milk, and those numbers are approximate: a quarter cup is about 30 g, half a cup about 60 g, and four cups about 480 g. Use the millilitres when you are measuring volume, and the grams when you are measuring weight — and remember that only the grams need a scale to check.
There is one more conversion worth knowing. One US cup is 8 US fluid ounces, so 1 cup of powdered milk is also 8 fl oz by volume — but fluid ounces are a volume measure, not a weight measure, and powdered milk does not weigh 8 ounces. Do not confuse the two: 8 fl oz of powdered milk is a volume of 236.6 ml, while the weight is about 120 g. If a recipe gives ounces and you are not sure which kind it means, check whether it is talking about a measuring jug (fluid ounces, volume) or a scale (ounces, weight). When a recipe is ambiguous, the gram figure on this page is the safer one to follow.
Worked examples
A hot chocolate mix that needs half a cup
A hot chocolate mix that uses ½ cup of powdered milk needs 118.3 ml, about 60 g. Whisk the powder into the dry mix thoroughly before adding liquid, so it disperses evenly and does not clump. If you are making a single mug, scale down to tablespoons: one tablespoon is about 7.5 g.
Reconstituting milk for a recipe
If a recipe needs a cup of milk and you only have powdered milk, the powder figure is your starting point: 120 g of powder plus water makes roughly a cup of milk. Add the powder to the water, whisk well, and let it stand for a few minutes so it hydrates fully before you use it in the recipe. A lumpy milk will not behave like fresh milk in a batter.
Baking bread with a cup of powder
A bread recipe that calls for 1 cup of powdered milk needs 236.6 ml, about 120 g. Spoon the powder into the cup and level it — never scoop from the bag — and add it with the other dry ingredients. The powder adds richness and a softer crumb, but only if the amount is right: too much makes the dough slack, too little makes no difference at all.
How to measure 1 cup of powdered milk
Powdered Milk is a powder, and powders are where cup measurements go wrong most often. A cup of powder can weigh very different amounts depending on whether it was spooned in loosely, scooped from the bag, or pressed down — and with a light powder the difference can be a third of the total weight. The figure on this page, 120 g per cup, is for powdered milk measured spooned and levelled, which is the lightest, most repeatable method. Copy it at home: spoon the powder into the cup until it heaps, then sweep a knife across the top. Never scoop the cup through the bag, and never tap the cup on the bench to settle the powder, because both pack more powder into the same volume. If the recipe matters — a bread dough, a hot chocolate mix, a reconstituted milk — weigh the powder instead. The scale does not care how fluffy the powder is.
The method behind our figure is spooned and levelled, and the source is USDA. In practice that means: take a dry measuring cup, spoon the powdered milk in until it heaps above the rim, then sweep a straight edge — the back of a knife is ideal — across the top to level it. Do not scoop the cup through the ingredient, do not tap the cup on the bench to settle the contents, and do not press the ingredient down. Each of those shortcuts packs more into the cup and makes the weight higher than the 120 g in the table, sometimes by a surprising amount. For a liquid or a pourable ingredient the method is simpler: pour into a liquid measuring jug, set it on a flat surface, and read the level at eye height.
If you do not have a scale, the spooned-and-levelled cup is the best you can do, and for most everyday cooking it is good enough. But if the recipe is a bake, a preserve, or anything where the ratio of ingredients does the structural work, borrow or buy a scale: even a basic digital scale is more accurate than the best cup technique, and it is faster once you are used to it. Put the bowl on the scale, press tare, and add powdered milk until the display reads the grams you need. That is the whole technique, and it removes the single biggest source of variation in cup-based recipes.
Working with powdered milk in real recipes
Powdered Milk is used for baking, bread machines, hot chocolate and camping food. Nonfat dry milk powder; reconstitutes with water.
Reconstituting: powder first, water second
Airtight container, cool and dry, up to 1 year. When you turn powdered milk back into milk, add the powder to the water rather than the water to the powder — the powder disperses more evenly that way and you avoid dry lumps at the bottom of the jug. Whisk well and let it stand for a few minutes before using, so the powder fully hydrates. A lumpy reconstituted milk will not behave like fresh milk in a recipe.
The scale is your friend with powders
Light powders are the worst case for cup measuring, because the same cup can hold very different weights depending on how the powder was handled. If you bake with powdered milk regularly, weigh it every time. The 120 g figure is the anchor; the cup is only an approximation of it.
Common mistakes with cups and millilitres
The most common mistake is treating the millilitre figure and the gram figure as interchangeable. They are not: 236.6 ml is a volume and 120 g is a weight, and the only ingredient for which they are equal is water, where 1 ml weighs 1 g. For powdered milk, 236.6 ml weighs about 120 g, and if you weigh out 236.6 g of powdered milk instead of measuring 236.6 ml, you will have the wrong amount — too much if 120 is greater than 236.6, too little if it is less. Always check whether the recipe wants a volume or a weight, and use the matching column of the table.
The second most common mistake is using the wrong cup. A US cup is 236.6 ml, a metric cup is 250 ml, and a UK cup in older recipes can mean something else again. If your measuring cup came with a set that does not say which standard it follows, check it against a measuring jug: fill the cup with water and pour it into the jug. If it reads 236.6 ml, it is a US cup; if it reads 250 ml, it is a metric cup. Once you know, write it on the cup with a permanent marker so you never have to guess again.
The third mistake is measuring over the mixing bowl. It feels efficient, but a spill goes straight into the batter and cannot be taken back, and a cup read from above always looks fuller than it is. Measure over the sink or a plate, level the cup, and then tip it into the bowl. It takes five seconds longer and it prevents the kind of error that ruins a bake.
Frequently asked questions
How many millilitres is 1 cup of powdered milk?
1 cup of powdered milk is 236.6 ml. That figure is fixed: a US cup is defined as 236.6 ml, so it is the same for every ingredient. What changes from one ingredient to another is the weight, and 1 cup of powdered milk weighs about 120 g. The volume never changes; the weight always depends on the ingredient.
How many grams is 1 cup of powdered milk?
1 cup of powdered milk weighs about 120 g, measured spooned and levelled according to USDA. The word "about" matters: the exact weight of a cup depends on how the ingredient is handled, how finely it is ground or cut, and how much moisture it holds. For baking and for any recipe where the amount is critical, weigh the ingredient on a kitchen scale rather than trusting the cup.
Is 1 cup of powdered milk the same as 250 ml?
No. A US cup is 236.6 ml, while a metric cup — used in Australia and in many metric recipes — is 250 ml. The difference is 13.4 ml per cup, which is about 5.7%. If your recipe was written with metric cups and you measure with a US cup, you will be short on every cup; if it was written with US cups and you use a metric cup, you will be over. Check which cup your recipe means, and when in doubt use the gram figure, 120 g, which does not depend on the cup at all.
How many tablespoons of powdered milk are in a cup?
There are 16 tablespoons in 1 cup, so 1 cup of powdered milk is 16 tablespoons, weighing about 120 g in total. One tablespoon is about 7.5 g and one teaspoon is about 2.5 g. These spoon figures are worked back from the cup weight, so they carry the same approximation — they are useful for small amounts, but for a full cup the scale is still the more accurate tool.
How do I reconstitute powdered milk into milk?
Add the powder to water rather than the other way round, whisk well, and let it stand for a few minutes so the powder hydrates fully. Nonfat dry milk powder; reconstitutes with water. The powder figure on this page, 120 g per cup, is the dry weight; the amount of water you add depends on the milk you are making, so follow the instructions on the packet for the strength you want.
Can I use a kitchen scale instead of a cup for powdered milk?
Yes, and for most recipes you should. Put your bowl on the scale, press tare to zero it, and add powdered milk until the display reads the grams you need — 120 g for a full cup, 60 g for half a cup, 30 g for a quarter cup. A scale removes every variable that makes cup measuring unreliable: how firmly the ingredient was packed, how it was scooped, and how humid the day is.