Protein Powder (whey): Grams to Cups
1 cup of protein powder (whey) = 120 grams
One US cup of protein powder (whey) weighs 120 grams. One 250 ml metric cup — the one used in the UK, Australia, New Zealand and Canada — holds 127 grams. To convert any weight, divide the grams by the figure for your cup.
Whey protein powder varies a lot by brand and how finely it is milled; 120 g per cup is a working estimate, not a published reference. The scoop in the tub and the label's grams per scoop are the accurate measure.
Where the 120 g figure comes from
Neither USDA FoodData Central nor King Arthur Baking publishes a cup weight for protein powder (whey), so 120 g is this site's working estimate. Weigh it when the result matters.
How many cups is X grams of protein powder (whey)?
| Grams | US cups | Metric cups | Tablespoons | Ounces |
|---|---|---|---|---|
| 25 g protein powder (whey) | ¼ | ¼ | 3.33 | 0.88 |
| 50 g protein powder (whey) | ⅜ | ⅜ | 6.67 | 1.76 |
| 75 g protein powder (whey) | ⅝ | ⅝ | 10 | 2.65 |
| 100 g protein powder (whey) | ⅞ | ¾ | 13.33 | 3.53 |
| 110 g protein powder (whey) | ⅞ | ⅞ | 14.67 | 3.88 |
| 120 g protein powder (whey) | 1 | 0.95 | 16 | 4.23 |
| 125 g protein powder (whey) | 1.04 | 1 | 16.67 | 4.41 |
| 130 g protein powder (whey) | 1⅛ | 1 | 17.33 | 4.59 |
| 140 g protein powder (whey) | 1⅛ | 1⅛ | 18.67 | 4.94 |
| 150 g protein powder (whey) | 1¼ | 1⅛ | 20 | 5.29 |
| 170 g protein powder (whey) | 1⅜ | 1⅓ | 22.67 | 6.00 |
| 175 g protein powder (whey) | 1½ | 1⅜ | 23.33 | 6.17 |
| 200 g protein powder (whey) | 1⅔ | 1⅝ | 26.67 | 7.05 |
| 225 g protein powder (whey) | 1⅞ | 1¾ | 30 | 7.94 |
| 240 g protein powder (whey) | 2 | 1⅞ | 32 | 8.47 |
| 250 g protein powder (whey) | 2⅛ | 2 | 33.33 | 8.82 |
| 275 g protein powder (whey) | 2¼ | 2⅛ | 36.67 | 9.70 |
| 300 g protein powder (whey) | 2½ | 2⅜ | 40 | 10.58 |
| 350 g protein powder (whey) | 2⅞ | 2¾ | 46.67 | 12.35 |
| 400 g protein powder (whey) | 3⅓ | 3⅛ | 53.33 | 14.11 |
| 450 g protein powder (whey) | 3¾ | 3½ | 60 | 15.87 |
| 500 g protein powder (whey) | 4⅛ | 3.94 | 66.67 | 17.64 |
How to measure protein powder (whey) accurately
The 120 g figure assumes the spooned-and-levelled method: spoon the protein powder (whey) into a dry measuring cup and sweep the top flat with a straight edge. Scooping the cup through the bag compacts it and gives a heavier cup.
- 1 US cup of protein powder (whey) = 120 g
- 1 metric cup (250 ml) of protein powder (whey) = 127 g
- ¾ cup = 90 g
- ½ cup = 60 g
- ⅓ cup = 40 g
- ¼ cup = 30 g
- 1 tablespoon = 7.5 g
Frequently asked questions
How many cups is 100 grams of protein powder (whey)?
100 grams of protein powder (whey) is about ⅞ US cups, based on 120 g per cup, or ¾ metric cups.
How many grams in a cup of protein powder (whey)?
One US cup of protein powder (whey) weighs 120 grams. A 250 ml metric cup holds 127 grams.
How many cups is 250 grams of protein powder (whey)?
250 grams of protein powder (whey) is about 2⅛ US cups, or 2 metric cups.
Does a UK cup of protein powder (whey) weigh the same as a US cup?
No. A UK, Australian or Canadian metric cup is 250 ml against the US 236.6 ml, so it holds about 5.7% more — 127 g of protein powder (whey) rather than 120 g.
How many tablespoons is 100 grams of protein powder (whey)?
100 grams of protein powder (whey) is about 13.33 tablespoons.
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