How many grams in a cup of cornstarch?

The short answer first, then a table for every common measure and how to fill your cup so the numbers match.

Quick answer

1 US cup of cornstarch weighs about

128 g
Metric cup (250 mL)135 g
1 tablespoon8 g
1 teaspoon2.7 g

Cups of cornstarch to grams

CupsUS cupMetric cup
¼ cup32 g34 g
⅓ cup43 g45 g
½ cup64 g68 g
⅔ cup85 g90 g
¾ cup96 g101 g
1 cup128 g135 g
2 cups256 g271 g

Grams of cornstarch to cups

100 g¾ cup
250 g1.95 cups
500 g3 ⅞ cups

US cups.

Measure it right

  1. 1Fluff itStir it in the bag or jar so it isn’t packed.
  2. 2Spoon it inSpoon it into the cup until it overflows. Don’t press or tap.
  3. 3Level the topSweep a flat knife across the rim.

Nutrition

PerCaloriesProteinCarbsFat
1 US cup4880.3 g117 g0.1 g
100 g3810.3 g91.3 g0.1 g
See calories and macros →

Common questions

Which cup size does my recipe use?

US recipes use 236.6 mL. Many Arab, UK and Australian recipes use a 250 mL metric cup, which holds about 135 g of cornstarch.

Is it better to weigh cornstarch?

Yes. A cup can hold more or less depending on how you fill it. A kitchen scale gives the same result every time.

Source: USDA FoodData Central, SR Legacy #169698 (1 cup = 128 g). Values are approximate.