Ounces of skim milk to cups runs on one number, 0.11571234 cups per ounce. It is a measured property of this ingredient rather than a defined conversion, which is why a generic volume-to-weight tool cannot give you it.
Put next to water — 1 g per mL exactly — skim milk measures 1.0356 g per mL. That ratio, 103.6%, is what separates this page from every other ingredient in the same units, and it is measured rather than defined.
A cup of skim milk is 245 g when it is measured the standard way, but how it gets into the cup changes the answer: between about 243.8 g and 247.4 g covers the range from lightly spooned to firmly packed. That 1% spread is larger than most of the adjustments recipes fuss over, and it disappears entirely the moment the ingredient is weighed instead.
One cup of skim milk is 8.642 oz. US kitchen scales usually step in eighths of an ounce, which is 3.54 g — around 1.45% of a cup of this ingredient, so the scale is precise enough for a full cup and coarse for a spoonful. That is why recipes mix the two systems: ounces for the bulk, spoons for the small amounts.
How the figure is arrived at: Marginally denser than whole milk, because the fat removed from it was the lightest part.
The formula
ounces- The amount of skim milk you are converting, in ounces
0.115712339286- Cups per ounce for skim milk, from its density of 1.0356 g/mL
cups- The equivalent quantity in cups
How it works, step by step
- Enter the quantity in ounces.
- It is multiplied by 0.115712339286, the cups-per-ounce figure for skim milk.
- The result appears in cups, with a second reading in tbsp beneath it.
- Use the measure table if you want a standard recipe quantity rather than a number you type in.
Worked examples
2 oz of skim milk in cups
2 oz of skim milk weighs out at 0.231425 cups. Divide 0.231425 by 0.11571234 and you get back to 2 oz, which is the quickest check that the factor is the right way up.
4 oz of skim milk in cups
A recipe calling for 4 oz of skim milk needs 0.462849 cups on the scale. The arithmetic is 4 × 0.11571234 = 0.46284936, and halving the recipe halves the weight to 0.231425 cups.
12 oz of skim milk in cups
A recipe calling for 12 oz of skim milk needs 1.38855 cups on the scale. The arithmetic is 12 × 0.11571234 = 1.3885481, and halving the recipe halves the weight to 0.694274 cups.
How to read your score
Frequently asked questions
How many cups are in 1 oz of skim milk?
One ounce of skim milk is 0.11571234 cups. Half that quantity is 0.0578562 cups and double it is 0.231425 cups, so the figure scales straight up and down — there is no offset in this conversion, only the factor.
Why is a cup of skim milk not 236 g like water?
Because weight per cup depends on what is in the cup. Skim milk has a density of 1.0356 g per mL where water has 1.00, so a cup of it weighs 245 g rather than 236.6 g. That is a difference of 8.4 g per cup, and it is the reason a single volume-to-weight factor cannot be applied to every ingredient.
Does how I measure it change the weight?
Barely. Skim milk does not compress, so a cup of it is 245 g however it is poured — within about 1%, which is inside the accuracy of a domestic scale. This is the group where measuring by volume is defensible.
Is a fluid ounce of skim milk the same as an ounce?
No. A fluid ounce is a volume — one eighth of a US cup, 29.57 mL — and an ounce is a weight. One fluid ounce of skim milk weighs 1.08 oz, so the two readings differ by 8.03%. They coincide only for something with the density of water, and then only roughly.
Is this a US cup or a metric cup?
US customary: 236.59 mL, which is the cup every US recipe means. A metric cup is 250 mL, so the same cup of skim milk would weigh 258.89 g instead of 245 g — 13.9 g more, or 5.67%. Australian and some European recipes use the metric cup, and the difference is large enough to matter in baking.
Do I need a scale for this, or will measuring cups do?
A scale, if the result matters. Volume measuring carries a spread of about 1% for skim milk — roughly 2.45 g on a 245 g cup — while a domestic scale is accurate to a gram or two. For anything where the ratio of ingredients drives the outcome, bread and pastry above all, weigh it.
How much does 2 cup of skim milk weigh?
2 cup of skim milk comes to 490 g, or 17.284 ounces. This page runs that calculation in reverse — enter a weight and it returns the volume — and the cups-to-ounces page does it in the direction the question is usually asked.
Skim milk in ounces and cups
| Ounces | Cups | Unrounded |
|---|---|---|
| 1/2 oz | 0.0578562 cup | 0.05785616964 |
| 1 oz | 0.115712 cup | 0.1157123393 |
| 2 oz | 0.231425 cup | 0.2314246786 |
| 3 oz | 0.347137 cup | 0.3471370179 |
| 4 oz | 0.462849 cup | 0.4628493571 |
| 6 oz | 0.694274 cup | 0.6942740357 |
| 8 oz | 0.925699 cup | 0.9256987143 |
| 12 oz | 1.38855 cup | 1.388548071 |
| 16 oz | 1.8514 cup | 1.851397429 |
Based on 245 g per cup of skim milk. One ounce of skim milk is 0.11571234 cups.
| Measure | Grams | Ounces | Millilitres |
|---|---|---|---|
| 1 cup | 245 g | 8.64 oz | 236.6 mL |
| 3/4 cup | 183.8 g | 6.48 oz | 177.4 mL |
| 2/3 cup | 163.3 g | 5.76 oz | 157.7 mL |
| 1/2 cup | 122.5 g | 4.32 oz | 118.3 mL |
| 1/3 cup | 81.67 g | 2.88 oz | 78.86 mL |
| 1/4 cup | 61.25 g | 2.16 oz | 59.15 mL |
| 1 tbsp | 15.31 g | 0.54 oz | 14.79 mL |
| 1 tsp | 5.104 g | 0.18 oz | 4.929 mL |
US customary measures: 1 cup = 236.59 mL, 1 tbsp = 14.79 mL, 1 tsp = 4.93 mL.
| Ingredient | Grams per cup | Ounces per cup | Density (g/mL) |
|---|---|---|---|
| Half-and-half | 242 g | 8.536 oz | 1.023 |
| Egg whites | 243 g | 8.572 oz | 1.027 |
| Whole milk | 244 g | 8.607 oz | 1.031 |
| Skim milk (this page) | 245 g | 8.642 oz | 1.036 |
| Buttermilk | 245 g | 8.642 oz | 1.036 |
| Plain yogurt | 245 g | 8.642 oz | 1.036 |
| Tomato sauce | 245 g | 8.642 oz | 1.036 |
Ordered by weight. The spread across this group is why a single generic cups-to-grams factor cannot work.