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cornstarch measures about 128 g per cup.
| Volume | Grams |
|---|---|
| 1 cup | 128 g |
| 1/2 cup | 64 g |
| 1/3 cup | 42.7 g |
| 1/4 cup | 32 g |
| 1 tablespoon | 8 g |
| 1 teaspoon | 2.7 g |
| 1 ounce (weight) | 28.4 g |
128 grams per cup.
About 8 grams per tablespoon (2.7 g per teaspoon).
No — cornstarch weighs about 128 g per cup, while a cup of water is 237 g. Weight is always the accurate measure.