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Cornstarch: cups to grams

1 cup of cornstarch = 128 grams (4.5 oz). 1 tablespoon = 8.0 g, 1 teaspoon = 2.7 g.
Fractions work: 1/3, 1 1/2

Cornstarch cups to grams chart

US cupsGramsOunces
1/8 cup16 g0.56 oz
1/4 cup32 g1.1 oz
1/3 cup43 g1.5 oz
1/2 cup64 g2.3 oz
2/3 cup85 g3.0 oz
3/4 cup96 g3.4 oz
1 cup128 g4.5 oz
1 1/2 cups192 g6.8 oz
2 cups256 g9.0 oz
3 cups384 g13.5 oz
4 cups512 g18.1 oz

Tablespoons and teaspoons

Spoon measureGrams
1 teaspoon2.7 g
2 teaspoons5.3 g
1 tablespoon8.0 g
2 tablespoons16 g
3 tablespoons24 g
4 tablespoons (1/4 cup)32 g

Cornstarch grams to cups

GramsUS cups (decimal)Closest kitchen measure
25 g0.203 tbsp
50 g0.391/3 cup + 1 tbsp
100 g0.783/4 cup + 0.5 tbsp
125 g0.983/4 cup + 3.5 tbsp
150 g1.171 cup + 3 tbsp
200 g1.561 1/2 cups + 1 tbsp
250 g1.951 3/4 cups + 3.5 tbsp
300 g2.342 1/3 cups
400 g3.133 cups + 2 tbsp
500 g3.913 3/4 cups + 2.5 tbsp
750 g5.865 3/4 cups + 2 tbsp
1000 g7.817 3/4 cups + 1 tbsp

"Closest kitchen measure" rounds down to the nearest standard cup size, then makes up the rest in tablespoons, to the nearest half tablespoon.

Where this number comes from

The weight is taken from the USDA FoodData Central SR Legacy record "Cornstarch" (FDC ID 169698), portion "1 cup" = 128 g. US cups are 236.59 mL. A metric cup (250 mL) holds about 135 g, and a UK imperial cup (284 mL) about 154 g.

Real kitchens vary. Brand, humidity, how finely something is ground and how hard you pack the cup can all move the weight by 5–15%. If a recipe author gives grams, use their number.

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