how many grams in a cup of cornstarch?

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conversion reference

things people ask

• How much does one cup of cornstarch weigh?
  Spoon-and-leveled, one cup is about 112 g — the figure King Arthur and most gluten-free baking references use. Cornstarch settles tightly during shipping, so a dipped cup can read 135-140 g on a scale. For a gluten-free flour blend where cornstarch is 20-30% of the mix, that 25 g surplus throws the whole hydration off.
• Why does my pie filling thicken too much?
  Cup-measured cornstarch is the usual culprit. A standard fruit pie uses 1/4 to 1/2 cup (28-56 g) for 5-6 cups of fruit; if you scooped instead of spooned, you may have added 35-70 g and crossed into pudding territory. Weigh cornstarch for pie fillings — the difference between sliceable and stiff is 10-15 g.
• Can I swap cornstarch cup-for-cup with flour for thickening?
  No — cornstarch is roughly twice as potent as all-purpose flour for thickening, so 1 cup cornstarch (112 g) replaces about 2 cups flour by volume. For a gravy or stew that calls for 1/4 cup flour, use 2 tablespoons cornstarch instead. Cornstarch also gives a glossier, more translucent finish than flour's opaque gravy texture.

related conversions

• Cornstarch: tablespoons to grams
• Cornstarch: teaspoons to grams
• Cornstarch guide