20g Protein Powder to Cups
20 grams of protein powder is a small amount, best measured with a spoon rather than a full cup. At 120g per cup, it works out to 2.7 tablespoons.
- Cups (US Customary)
- 0.17 (⅛)
- Tablespoons
- 2.7
- Teaspoons
- 8.0
- Milliliters
- 39 ml
20 grams of protein powder = 0.17 cups (⅛ cup / 2.7 tbsp / 8.0 tsp)
Protein Powder has a density of approximately 120g per cup. Whey and plant-based blends vary by brand — check the label. Source: USDA FoodData Central. This is the figure used everywhere on this page, including the tablespoon and teaspoon values, so the numbers stay consistent whether you're reading the summary line, the table, or the FAQ answers below.
| Grams | Cups | Fraction | Tablespoons | Teaspoons |
|---|---|---|---|---|
| 10g | 0.08 | ⅛ | 1.3 | 4.0 |
| 15g | 0.13 | ⅛ | 2.0 | 6.0 |
| 20g | 0.17 | ⅛ | 2.7 | 8.0 |
| 25g | 0.21 | ¼ | 3.3 | 10.0 |
| 30g | 0.25 | ¼ | 4.0 | 12.0 |
The Math for 20g of Protein Powder
20g divided by 120g (the weight of one cup of protein powder) equals 0.17 cups. Multiplying that by 16 gives 2.7 tablespoons, and by 48 gives 8.0 teaspoons, since one cup always equals 16 tablespoons or 48 teaspoons regardless of the ingredient.
Protein Powder is lighter than water, which weighs about 236g per cup. That's why 20g of protein powder takes up more volume (39ml) than the same weight of water would (20ml). For a side-by-side look at how other ingredients compare, see the 20 grams to cups page.
Metric and Imperial Cup Sizes
The 0.17 cup figure above uses the US Customary cup (236.588ml). Recipes written outside the US sometimes use a metric cup (250ml) or an imperial (uk) cup (284.131ml) instead. At 20g, that's ⅛ metric cups or ⅛ imperial cups of protein powder, close to the US figure but not identical. The cup standard switch in the converter above recalculates this instantly for any gram amount.
Making More or Less Than 20g
Doubling a recipe that calls for 20g of protein powder means weighing 40g, or measuring 0.33 cups if you're working by volume instead of weight. Halving it means 10g, or 0.08 cups. Weight scales exactly with simple multiplication; cup measurements compound any scooping error each time they're doubled or halved, so weighing is more reliable the more a recipe is scaled.
How Protein Powder Compares to Similar Ingredients
Within dry goods, density still varies by ingredient. At 20g, cornstarch (128g per cup) measures ⅛ cup, while rolled oats (90g per cup) measures ¼ cup, compared to ⅛ cup for protein powder. Swapping ingredients in a recipe by cup measurement alone, without adjusting for this difference, changes the actual weight used.
Typical Uses for Protein Powder
- A single protein shake serving typically uses 30g to 40g of protein powder.
- Protein pancake recipes often call for 30g mixed into the batter.
- No-bake protein bars usually need about 60g to 90g per batch.
Getting an Accurate Spoon Measurement
Dry Goods
Spoon into the cup and level off. Ingredients like cocoa powder benefit from a quick sift first to break up clumps.
For exact results
Baking soda and baking powder should always be measured with a dry measuring spoon, leveled flat — a heaping spoonful of either can meaningfully change how a baked good rises.
For every gram amount at once, the protein powder conversion chart lists protein powder across the full range from 1g to 1000g in one table.
Frequently Asked Questions
What is 20 grams of protein powder in cups?+
20 grams of protein powder is 0.17 cups, or 2.7 tablespoons.
Should I use a spoon or a cup for 20g of protein powder?+
At 20g, a tablespoon or teaspoon measurement is usually more practical than a fractional cup. Use 2.7 tablespoons or 8.0 teaspoons.
Is 20 grams of protein powder the same as 20 milliliters?+
Only if it weighed the same as water. 20g of water is about 20ml, while 20g of protein powder is 39ml, because the two have different densities.
Does the answer change for a metric or imperial cup?+
Slightly. 20g of protein powder is ⅛ metric cups or ⅛ imperial cups, close to the US figure but not identical, since each standard defines the cup at a different volume.