How many grams in a cup of cornstarch?
1 cup of cornstarch weighs 128 g.1 tablespoon: 8 g1 teaspoon: 2.7 g
Weights are for cornstarch (unsifted), in US customary cups.
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= 128 g
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Cups to grams
| Cups | Grams |
|---|---|
| ⅛ cup | 16 g |
| ¼ cup | 32 g |
| ⅓ cup | 43 g |
| ½ cup | 64 g |
| ⅔ cup | 85 g |
| ¾ cup | 96 g |
| 1 cup | 128 g |
| 1 ½ cups | 192 g |
| 2 cups | 256 g |
| 3 cups | 384 g |
Grams to cups
| Grams | US measure |
|---|---|
| 25 g | ≈ 3 tbsp + ½ tsp |
| 50 g | ≈ ⅜ cup |
| 100 g | ≈ ¾ cup + 1 tbsp |
| 150 g | ≈ 1 cup + 3 tbsp |
| 200 g | 1 ½ cups + 1 tbsp |
| 250 g | 1 ¾ cups + 3 tbsp |
| 500 g | 3 ¾ cups + 3 tbsp |
| 1,000 g | 7 ¾ cups + 1 tbsp |
Rounded to amounts you can measure; ≈ marks a rounded answer.
Measuring cornstarch
Cornstarch packs down easily. For thickening, small differences rarely matter.
These weights are for cornstarch (unsifted). A different form, or a cup filled another way, weighs differently, so weigh it if the recipe gives grams.
The King Arthur Baking ingredient weight chart gives 112 g per cup. Fine starches compact easily, so cup weights vary. We use the USDA figure throughout.
Source
USDA FoodData Central, food 169698: “Cornstarch”, 1 cup = 128 g (USDA FoodData Central SR Legacy, April 2018). Other amounts are calculated with 1 cup = 16 tablespoons = 48 teaspoons. Data version 2026-10-17.1, reviewed 16 October 2026.
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