Convert Cups to Grams: Cornstarch
Convert cups of cornstarch to grams with this complete reference table. 1 cup of cornstarch = 128g (USDA FoodData Central, spooned-and-leveled method). Use the table below for fractions from 1/8 cup up to 4 cups. For precision baking, weight measurements in grams are always more reliable than volume measurements in cups, because cornstarch density can vary by measuring technique.
Cornstarch Cups to Grams Table
| Cups | Grams |
|---|---|
| 1/8 cup | 16g |
| 1/4 cup | 32g |
| 1/3 cup | 42.7g |
| 1/2 cup | 64g |
| 2/3 cup | 85.3g |
| 3/4 cup | 96g |
| 1 cup | 128g |
| 1 1/4 cups | 160g |
| 1 1/2 cups | 192g |
| 2 cups | 256g |
| 3 cups | 384g |
| 4 cups | 512g |
Based on USDA FoodData Central data (1 US cup = 240ml = 16 tablespoons = 48 teaspoons). Note: Cornstarch (corn flour in UK) is a fine white powder. 1 cup = 128g. Used as a thickener for sauces and gravies. 1 tablespoon cornstarch = 2 tablespoons all-purpose flour as a thickener.
About Cornstarch Density
The density of cornstarch determines how much it weighs per unit of volume. At 0.533g/ml, 1 US cup (240ml) of cornstarch weighs 128g under USDA standard conditions.
Volume measurements can vary by ±10–20% depending on technique (sifted vs. spooned vs. scooped). For consistent baking results, use a kitchen scale with gram measurements whenever possible. The USDA standard (spooned-and-leveled) is the reference point for all values on this page.
Frequently Asked Questions
How many grams is 1 cup of cornstarch?
1 cup of cornstarch weighs 128 grams (USDA FoodData Central, spooned-and-leveled method, 1 US cup = 240ml).
How many grams is 1/2 cup of cornstarch?
1/2 cup of cornstarch weighs 64 grams.
How many grams is 1/4 cup of cornstarch?
1/4 cup of cornstarch weighs 32 grams.
Does measuring technique affect the weight of cornstarch?
Yes. Sifted cornstarch can weigh up to 20% less than packed or scooped. The USDA standard (spooned-and-leveled) of 128g/cup is the most reliable baseline.