Grams to Cups: Cornstarch
1 cup of cornstarch weighs about 128 grams. Convert any amount between grams, cups and spoons below.
100 g of cornstarch = ¾ cup (0.78 exactly)
How much does 1 cup of cornstarch weigh?
One US cup of cornstarch weighs about 128 grams (4.5 oz). A tablespoon holds about 8.0 g and a teaspoon about 2.7 g.
| Amount | Cornstarch in grams |
|---|---|
| 1 cup | 128 g |
| ¾ cup | 96 g |
| ⅔ cup | 85 g |
| ½ cup | 64 g |
| ⅓ cup | 43 g |
| ¼ cup | 32 g |
| 1 tablespoon | 8.0 g |
| 1 teaspoon | 2.7 g |
Grams to cups cornstarch chart
| Grams | Cups | Decimal cups |
|---|---|---|
| 25 g | ¼ cup | 0.20 |
| 50 g | ⅜ cup | 0.39 |
| 75 g | ⅝ cup | 0.59 |
| 100 g | ¾ cup | 0.78 |
| 125 g | 1 cup | 0.98 |
| 150 g | 1 ⅛ cups | 1.17 |
| 200 g | 1 ½ cups | 1.56 |
| 250 g | 2 cups | 1.95 |
| 300 g | 2 ⅓ cups | 2.34 |
| 400 g | 3 ⅛ cups | 3.12 |
| 500 g | 3 ⅞ cups | 3.91 |
| 750 g | 5 ⅞ cups | 5.86 |
| 1000 g | 7 ¾ cups | 7.81 |
How to measure cornstarch
Fluff the cornstarch first, spoon it into a dry measuring cup and sweep the top level with a knife. Scooping straight from the bag packs it down and can add 20 to 30 grams per cup.
Cornstarch compared with other flours & starches
Different flours & starches weigh different amounts per cup, so never swap one for another by volume without converting.
| Ingredient | 1 cup in grams |
|---|---|
| All-purpose flour | 125 g |
| Bread flour | 127 g |
| Cake flour | 114 g |
| Whole wheat flour | 120 g |
| Self-rising flour | 125 g |
| Almond flour | 96 g |
| Coconut flour | 112 g |
| Cornmeal | 138 g |
Frequently asked questions
How many grams are in a cup of cornstarch?
One US cup of cornstarch is about 128 grams.
How many cups is 100 grams of cornstarch?
100 grams of cornstarch is about ¾ cup (0.78 cups).
How many cups is 250 grams of cornstarch?
250 grams of cornstarch is about 2 cups (1.95 cups).
How many grams in a tablespoon of cornstarch?
A level tablespoon of cornstarch weighs about 8.0 grams.
Other ingredients
Last updated: November 2026. Values use the US cup (236.6 ml) and the spoon-and-level method for dry ingredients.