The Short Answer
For a quick gut check: 100 grams of milk comes out to 0.42 cups, and 480 grams is about 2 cups. This works pretty well for almost every recipe — but the numbers depend on what kind of milk is in the carton.
Grams To Cups Converter
Convert grams to cups instantly for common cooking and baking ingredients.
Why Milk Isn't Exactly the Same Weight as Water
Pure water weighs 236.6 grams per US cup — no more, no less, at room temperature. Milk is heavier because it's not pure water; it's a suspension of fat globules, milk proteins, and lactose (milk sugar) all dissolved or floating in that water. The more fat and solids a milk contains, the more it weighs per cup, because those components are slightly denser than water itself.
That's why whole milk, skim milk, and oat milk don't all land on exactly the same gram figure, even though they look and pour almost identically.
Milk Weight By Type
| Milk Type | Grams per Cup | Notes |
|---|---|---|
| Whole milk (3.25% fat) | ~244 g | Highest fat content among common dairy milks |
| 2% reduced-fat milk | ~241 g | Slightly lighter than whole |
| Skim milk (fat-free) | ~245 g | Higher water and protein ratio, close to whole |
| Heavy cream | ~238 g | Higher fat but different structure than milk |
| Buttermilk | ~245 g | Cultured, slightly thicker than plain milk |
| Oat milk | ~245 g | Varies noticeably by brand and added thickeners |
| Almond milk | ~240 g | Often close to water, since fat content is low |
| Soy milk | ~245 g | Higher protein content than most plant milks |
These figures can vary slightly between milk products because composition and added ingredients can differ by brand. USDA reference data lists a serving weight of about 244 grams for whole milk and 245 grams for skim milk, supporting a practical range of roughly 240–245 grams per US cup for common dairy milk. If a recipe requires precise measurements, weighing the specific milk you are using is more reliable than relying on a generic conversion chart.
Reference: USDA — A Dietary Assessment of the U.S. Food Supply
Grams To Cups Chart
| Grams | Cups (approx.) |
|---|---|
| 30 g | ⅛ cup |
| 60 g | ¼ cup |
| 100 g | ~⅖ cup |
| 150 g | ~⅝ cup |
| 200 g | ~⅚ cup |
| 240 g | 1 cup |
| 300 g | ~1¼ cups |
| 400 g | ~1⅔ cups |
| 500 g | ~2⅛ cups |
Does Cup Size Affect the Result?
Yes — and this trips people up more often with liquids than with dry ingredients, because "a cup of milk" sounds universal. It isn't:
| Cup Standard | Volume | Milk Weight |
|---|---|---|
| US Customary Cup | 236.6 mL | ~240 g |
| US Legal Cup | 240 mL | ~244 g |
| Metric Cup (used in Australia, UK recipes) | 250 mL | ~254 g |
| Imperial Cup (older UK standard) | 284.1 mL | ~288 g |
If a recipe comes from outside the US — particularly Australian or UK sources — it's likely using the 250 mL metric cup, not the US customary one. That 14 mL gap seems small, but across several cups of liquid in a recipe, it adds up enough to affect batter consistency.
Why Measuring Milk by Weight Is More Reliable
Liquid measuring cups are read at eye level, which introduces small human error every time — a fraction of a degree in how you're looking at the line can shift the reading. Milk also clings slightly to the sides of a cup, meaning a small residue often gets left behind rather than poured out. Neither error is significant on its own, but in recipes with tight ratios — pastry cream, ganache, or bread dough where hydration percentage matters — those small inconsistencies can be the difference between a dough that comes together properly and one that's slightly too wet or dry.
A digital kitchen scale set to grams removes both issues: you're weighing exactly what goes into the bowl, with no meniscus to read and no residue left in the cup.
Quick Reference
- 60 g milk = ¼ cup
- 120 g milk = ½ cup
- 240 g milk = 1 cup
- 480 g milk = 2 cups
- 15 g milk ≈ 1 tablespoon
The Bottom Line
240 grams per cup is a safe, reliable baseline for whole milk and works well enough for most home baking. If you're working with skim milk, plant-based milk, or a recipe that came from outside the US, it's worth checking both the fat content and the cup standard being used — small shifts in either can move the number by 5–15 grams per cup, which rarely matters for a glass of milk but can matter for a recipe with tight ratios.
Other Ingredients
Grams-to-cups conversion isn't only useful for milk. Each of these has its own weight-per-cup because densities differ: