grams in a cup
baking basics

Cornstarch:
Grams to Cups

128 g per cup
64 g per ½ cup
32 g per ¼ cup

By Stefan Ulrich · Last updated

Dry cornstarch is assigned 128 g per cup as this site's reference, lightly spooned and levelled. It means pure white corn starch, not yellow cornmeal.

Convert: Cornstarch

1 US cup ≈ 128 g

US cups

= — g

g

= — US cups

Quick reference

Grams at a glance — Cornstarch
How much Cornstarch weighs at each cup measure: ¼ cup 32 g, ⅓ cup 43 g, ½ cup 64 g, ¾ cup 96 g, 1 cup 128 g ¼ 32 g ⅓ 43 g ½ 64 g ¾ 96 g 1 128 g

How much Cornstarch weighs at each cup measure.

Measurement Table

Cups Grams Ounces
1 tsp 3 g 0.11 oz
1 tbsp 8 g 0.28 oz
⅛ cup 16 g 0.56 oz
¼ cup 32 g 1.13 oz
⅓ cup 43 g 1.52 oz
½ cup 64 g 2.26 oz
⅔ cup 85 g 3.00 oz
¾ cup 96 g 3.39 oz
1 cup 128 g 4.51 oz
1¼ cups 160 g 5.64 oz
1½ cups 192 g 6.77 oz
2 cups 256 g 9.03 oz
3 cups 384 g 13.54 oz

About Cornstarch

For a small thickening quantity, a level measuring spoon is more practical than a cup. Stir the measured starch with cold liquid into a smooth slurry before adding it to hot liquid, where the recipe calls for that method.

Cornstarch thickens as it cooks. The amount and cooking time depend on the sauce or filling, so the converter cannot determine the correct thickening dose from liquid volume alone.

Tips for measuring Cornstarch

  • Mix a settled slurry again just before using it.
  • Use a dry utensil in the starch container.

Common mistakes

  • Adding dry starch directly to hot sauce and expecting it to disperse smoothly.

Frequently Asked Questions

How many grams are in a cup of Cornstarch?
This converter uses 128 g per US cup as its reference. Check the ingredient form and source notes above; use the recipe author's weight if one is provided.
What should I check when using Cornstarch?
Mix a settled slurry again just before using it. Use a dry utensil in the starch container.

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