Cornstarch to Cups
Cornstarch weighs approximately 128 grams per US customary cup. Use the calculator below to convert any amount of cornstarch between grams and cups.
About Cornstarch
Cornstarch is a fine, white starch used to thicken sauces, soups and desserts. One US cup weighs approximately 128 grams.
Whether you are scaling a recipe up, substituting an ingredient, or converting a recipe from metric to US measurements, having an accurate grams-per-cup value for cornstarch removes the guesswork from your cooking. Bookmark this page for quick reference whenever cornstarch appears in a recipe.
How much does a cup of cornstarch weigh?
A standard US cup of cornstarch weighs about 128 grams (4.52 ounces). That makes it almost the same weight as a cup of all-purpose flour, and lighter than a cup of granulated sugar (200 g). This is why a converter that uses the same factor for every ingredient will give wrong answers: cornstarch has its own density, and recipes depend on it.
Weight of common cornstarch measures
| Measure | Grams | Ounces |
|---|---|---|
| 1 teaspoon of cornstarch | 2.7 g | 0.09 oz |
| 1 tablespoon of cornstarch | 8 g | 0.28 oz |
| 1/4 cup of cornstarch | 32 g | 1.13 oz |
| 1/3 cup of cornstarch | 42.7 g | 1.51 oz |
| 1/2 cup of cornstarch | 64 g | 2.26 oz |
| 2/3 cup of cornstarch | 85.3 g | 3.01 oz |
| 3/4 cup of cornstarch | 96 g | 3.39 oz |
| 1 cup of cornstarch | 128 g | 4.52 oz |
| 2 cups of cornstarch | 256 g | 9.03 oz |
Values are reference weights for level, unpacked measures unless the ingredient is normally packed. Brand, moisture, temperature and how firmly you fill the cup can shift the result by a few percent, so for precision baking weigh cornstarch on a kitchen scale and use the cup figure only as a guide. To understand why these numbers differ between ingredients, read our guide on why a cup of flour is not a cup of sugar, or see why weighing beats measuring cups.
Cornstarch Conversion Table
| Grams | Cups | Ounces |
|---|---|---|
| 25 g | 0.20 cups | 0.88 oz |
| 50 g | 0.39 cups | 1.76 oz |
| 75 g | 0.59 cups | 2.65 oz |
| 100 g | 0.78 cups | 3.53 oz |
| 125 g | 0.98 cups | 4.41 oz |
| 150 g | 1.17 cups | 5.29 oz |
| 175 g | 1.37 cups | 6.17 oz |
| 200 g | 1.56 cups | 7.05 oz |
| 225 g | 1.76 cups | 7.94 oz |
| 250 g | 1.95 cups | 8.82 oz |
| 300 g | 2.34 cups | 10.58 oz |
| 400 g | 3.13 cups | 14.11 oz |
| 500 g | 3.91 cups | 17.64 oz |
Frequently Asked Questions
- help_outlineHow many cups is 100 grams of cornstarch?
100 grams of cornstarch is approximately 0.7812 cups, based on the standard reference of 128 grams per US cup.
- help_outlineHow many grams is 1 cup of cornstarch?
1 US cup of cornstarch weighs approximately 128 grams. Always level off the cup for the most accurate result.
- help_outlineIs the cornstarch cups conversion accurate for all brands?
The 128 g/cup value is a widely accepted average. Small variations can occur between brands and depending on how firmly the ingredient is packed.