400 Grams of Cornstarch to Cups
400 grams of cornstarch is a typical single-recipe amount, equal to 3.13 cups at a density of 128g per cup.
- Cups (US Customary)
- 3.13 (3⅛)
- Tablespoons
- 50.0
- Teaspoons
- 150.0
- Milliliters
- 739 ml
400 grams of cornstarch = 3.13 cups (3⅛ cups / 50.0 tbsp / 150.0 tsp)
Cornstarch has a density of approximately 128g per cup. Sifted cornstarch is closer to 115g. 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 |
|---|---|---|---|---|
| 350g | 2.73 | 2¾ | 43.8 | 131.3 |
| 375g | 2.93 | 2⅞ | 46.9 | 140.6 |
| 400g | 3.13 | 3⅛ | 50.0 | 150.0 |
| 425g | 3.32 | 3⅓ | 53.1 | 159.4 |
| 450g | 3.52 | 3½ | 56.3 | 168.8 |
How the 400g Figure Is Calculated
400g divided by 128g (the weight of one cup of cornstarch) equals 3.13 cups. Multiplying that by 16 gives 50.0 tablespoons, and by 48 gives 150.0 teaspoons, since one cup always equals 16 tablespoons or 48 teaspoons regardless of the ingredient.
Cornstarch is lighter than water, which weighs about 236g per cup. That's why 400g of cornstarch takes up more volume (739ml) than the same weight of water would (401ml). For a side-by-side look at how other ingredients compare, see the 400 grams to cups page.
If Your Recipe Uses Metric or Imperial Cups
The 3.13 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 400g, that's 2⅞ metric cups or 2⅝ imperial cups of cornstarch, close to the US figure but not identical. The cup standard switch in the converter above recalculates this instantly for any gram amount.
Scaling 400g Up or Down
Doubling a recipe that calls for 400g of cornstarch means weighing 800g, or measuring 6.25 cups if you're working by volume instead of weight. Halving it means 200g, or 1.56 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.
Cornstarch vs. Other Dry Goods
Within dry goods, density still varies by ingredient. At 400g, protein powder (120g per cup) measures 3⅓ cups, while rolled oats (90g per cup) measures 4½ cups, compared to 3⅛ cups for cornstarch. Swapping ingredients in a recipe by cup measurement alone, without adjusting for this difference, changes the actual weight used.
Where 400g of Cornstarch Fits in a Recipe
- Fruit pie fillings typically use 20g to 30g of cornstarch as a thickener.
- Stir-fry sauces often call for 10g mixed with water as a slurry.
- Custards and puddings usually need 15g to 25g per batch.
How to Measure It Accurately
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 cornstarch conversion chart lists cornstarch across the full range from 1g to 1000g in one table.
Frequently Asked Questions
What is 400 grams of cornstarch in cups?+
400 grams of cornstarch is 3.13 cups (3⅛ cups), or 50.0 tablespoons.
How do I measure 400 grams of cornstarch without a scale?+
Use 3⅛ cups, spooned in and leveled off with a straight edge. If you only have tablespoons, use 50.0 tablespoons instead.
Why is cornstarch's gram-to-cup ratio different from other ingredients?+
Cornstarch weighs 128g per cup because of its own density. Sifted cornstarch is closer to 115g.
Does a metric or imperial cup change this 400g conversion?+
Yes, slightly. 400g of cornstarch is 2⅞ metric cups or 2⅝ imperial cups, versus 3⅛ US cups, since each cup standard holds a different volume.