Cups of whole milk to ounces runs on one number, 8.6068467 ounces per cup. 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.
Water is the yardstick: 1 mL of it weighs 1 g. Whole milk comes in at 1.0313 g per mL, or 103.1% of water, which is why a cup of it is 244 g rather than 236.6 g. Volume and weight only line up for water, and only in metric.
A cup of whole milk is 244 g when it is measured the standard way, but how it gets into the cup changes the answer: between about 242.8 g and 246.4 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 whole milk is 8.607 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: About 87% water, with dissolved sugars and protein making up the rest — which is what puts it just above water in density.
The formula
cups- The amount of whole milk you are converting, in cups
8.6068467157- Ounces per cup for whole milk, from its density of 1.0313 g/mL
ounces- The equivalent quantity in ounces
How it works, step by step
- Enter the quantity in cups.
- It is multiplied by 8.6068467157, the ounces-per-cup figure for whole milk.
- The result appears in ounces, with a second reading in g beneath it.
- Use the measure table if you want a standard recipe quantity rather than a number you type in.
Worked examples
1/3 cup of whole milk in ounces
A recipe calling for 1/3 cup of whole milk needs 2.86895 ounces on the scale. The arithmetic is 0.333333 × 8.6068467 = 2.8689489, and halving the recipe halves the weight to 1.43447 ounces.
3/4 cup of whole milk in ounces
Take 3/4 cup of whole milk: 0.75 × 8.6068467 gives 6.45514 ounces. Doubling the batch takes it to 12.9103 ounces, because the relationship is a straight proportion once the density is known.
3 cup of whole milk in ounces
A recipe calling for 3 cup of whole milk needs 25.8205 ounces on the scale. The arithmetic is 3 × 8.6068467 = 25.82054, and halving the recipe halves the weight to 12.9103 ounces.
How to read your score
Frequently asked questions
How many ounces are in 1 cup of whole milk?
One cup of whole milk is 8.6068467 ounces. Half that quantity is 4.30342 ounces and double it is 17.2137 ounces, so the figure scales straight up and down — there is no offset in this conversion, only the factor.
Why is a cup of whole milk not 236 g like water?
Because weight per cup depends on what is in the cup. Whole milk has a density of 1.0313 g per mL where water has 1.00, so a cup of it weighs 244 g rather than 236.6 g. That is a difference of 7.4 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. Whole milk does not compress, so a cup of it is 244 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 whole 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 whole milk weighs 1.076 oz, so the two readings differ by 7.59%. 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 whole milk would weigh 257.83 g instead of 244 g — 13.8 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 whole milk — roughly 2.44 g on a 244 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 many cups of whole milk is 16 oz?
16 oz of whole milk is 1.859 cups — 0.116187 cups to one ounce, so 16 × 0.116187 = 1.859. Going that way is a division by 8.60685, or a multiplication by 0.116187 if you prefer.
Whole milk in cups and ounces
| Cups | Ounces | Unrounded |
|---|---|---|
| 1/8 cup | 1.07586 oz | 1.075855839 |
| 1/4 cup | 2.15171 oz | 2.151711679 |
| 1/3 cup | 2.86895 oz | 2.868948905 |
| 1/2 cup | 4.30342 oz | 4.303423358 |
| 2/3 cup | 5.7379 oz | 5.73789781 |
| 3/4 cup | 6.45514 oz | 6.455135037 |
| 1 cup | 8.60685 oz | 8.606846716 |
| 1 1/2 cup | 12.9103 oz | 12.91027007 |
| 2 cup | 17.2137 oz | 17.21369343 |
| 3 cup | 25.8205 oz | 25.82054015 |
| 4 cup | 34.4274 oz | 34.42738686 |
Based on 244 g per cup of whole milk. One cup of whole milk is 8.6068467 ounces.
| Measure | Grams | Ounces | Millilitres |
|---|---|---|---|
| 1 cup | 244 g | 8.61 oz | 236.6 mL |
| 3/4 cup | 183 g | 6.46 oz | 177.4 mL |
| 2/3 cup | 162.7 g | 5.74 oz | 157.7 mL |
| 1/2 cup | 122 g | 4.3 oz | 118.3 mL |
| 1/3 cup | 81.33 g | 2.87 oz | 78.86 mL |
| 1/4 cup | 61 g | 2.15 oz | 59.15 mL |
| 1 tbsp | 15.25 g | 0.538 oz | 14.79 mL |
| 1 tsp | 5.083 g | 0.179 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) |
|---|---|---|---|
| Tahini | 240 g | 8.466 oz | 1.014 |
| Half-and-half | 242 g | 8.536 oz | 1.023 |
| Egg whites | 243 g | 8.572 oz | 1.027 |
| Whole milk (this page) | 244 g | 8.607 oz | 1.031 |
| Skim milk | 245 g | 8.642 oz | 1.036 |
| Buttermilk | 245 g | 8.642 oz | 1.036 |
| Plain yogurt | 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.