Cornstarch Grams to Cups
Cornstarch weighs about 128g per cup. Sifted cornstarch is closer to 115g.
- Cups (US Customary)
- 0.78 (¾)
- Tablespoons
- 12.5
- Teaspoons
- 37.5
- Milliliters
- 185 ml
Cornstarch Grams to Cups Conversion Table
Cornstarch density: 128g per cup (USDA FoodData Central)
| Grams | Cups (Decimal) | Cups (Fraction) | Tablespoons |
|---|---|---|---|
| 10g | 0.08 | ⅛ | 1.3 |
| 25g | 0.20 | ¼ | 3.1 |
| 50g | 0.39 | ⅜ | 6.3 |
| 75g | 0.59 | ⅝ | 9.4 |
| 100g | 0.78 | ¾ | 12.5 |
| 125g | 0.98 | ⅞ | 15.6 |
| 150g | 1.17 | 1⅛ | 18.8 |
| 175g | 1.37 | 1⅜ | 21.9 |
| 200g | 1.56 | 1½ | 25.0 |
| 225g | 1.76 | 1¾ | 28.1 |
| 250g | 1.95 | 1⅞ | 31.3 |
| 300g | 2.34 | 2⅓ | 37.5 |
| 350g | 2.73 | 2¾ | 43.8 |
| 400g | 3.13 | 3⅛ | 50.0 |
| 500g | 3.91 | 3⅞ | 62.5 |
Ingredient Profile
Cornstarch has a density of 128g per cup, based on USDA FoodData Central data. Sifted cornstarch is closer to 115g.
Density can shift with brand, moisture content, or how the ingredient was packed before it reached your kitchen. Weighing on a scale removes that guesswork.
For comparison, honey is denser at 340g per cup, while panko breadcrumbs is lighter at 60g per cup — a reminder that weight per cup varies by ingredient, not by category alone.
How to Measure Cornstarch in Cups
Spoon into the cup and level off. Ingredients like cocoa powder benefit from a quick sift first to break up clumps.
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.
If a recipe calls for cornstarch by weight instead of volume, a digital kitchen scale set to grams removes any measuring-technique variation entirely — the converter at the top of this page shows both figures side by side so you can check your result either way.
Cornstarch vs Other Dry Goods
Ingredients in the same category don't always share a similar density. Here's how cornstarch compares to other dry goods on this site.
| Ingredient | Grams per Cup | vs Cornstarch |
|---|---|---|
| Cornstarch | 128g | baseline |
| Cocoa Powder | 85g | -34% |
| Table Salt | 288g | +125% |
| Rolled Oats | 90g | -30% |
| Baking Soda | 230g | +80% |
Common Recipe Uses
- 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 Much Is X Grams of Cornstarch?
Need every amount at once? See the full cornstarch conversion chart.
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Frequently Asked Questions
How many grams are in a cup of cornstarch?+
A cup of cornstarch weighs about 128g. Sifted cornstarch is closer to 115g.
How do I measure cornstarch accurately?+
Spoon into the cup and level off. Ingredients like cocoa powder benefit from a quick sift first to break up clumps.
Does cornstarch's weight per cup ever change?+
Yes, slightly. Sifted cornstarch is closer to 115g. A kitchen scale removes that variation entirely.
What's the best way to convert cornstarch from grams to cups?+
Use the converter at the top of this page, or divide your gram amount by 128 to get cups.
Why does cornstarch weigh a different amount per cup than other dry goods?+
Even within the same category, particle size, moisture, and packing differ enough to change the weight-per-cup figure by 10-30%. That's why this page uses a value measured specifically for cornstarch, not a category-wide average.
Is 128g per cup the same across every brand of cornstarch?+
It's close for most brands, though minor milling, processing, or moisture differences can shift the true figure by a few grams. USDA FoodData Central provides the reference value used here.