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Cornstarch: Cups to Grams

1 cup = 128 g

1 US cup of cornstarch weighs 128 grams (4.5 oz). Half a cup is 64 g and a tablespoon is 8 g.

Amount

Unit

Ingredient

Cups to grams

1/8 cup 16 g

1/4 cup 32 g

1/3 cup 42.7 g

1/2 cup 64 g

2/3 cup 85.3 g

3/4 cup 96 g

1 cup 128 g

1 1/2 cups 192 g

2 cups 256 g

3 cups 384 g

4 cups 512 g

Grams to cups

10 g 1 tbsp (0.08)

25 g 3 tbsp (0.2)

50 g 1/3 cup + 1 tbsp (0.39)

75 g 1/2 cup + 1 tbsp (0.59)

100 g 3/4 cup + 1 tbsp (0.78)

125 g 3/4 cup + 4 tbsp (0.98)

150 g 1 cup + 3 tbsp (1.17)

200 g 1 1/2 cups + 1 tbsp (1.56)

250 g 1 3/4 cups + 3 tbsp (1.95)

300 g 2 1/3 cups (2.34)

400 g 3 cups + 2 tbsp (3.13)

500 g 3 3/4 cups + 3 tbsp (3.91)

750 g 5 3/4 cups + 2 tbsp (5.86)

1000 g 7 3/4 cups + 1 tbsp (7.81)

Spoons to grams

1 tablespoon 8 g

1 teaspoon 2.7 g

½ teaspoon 1.3 g

¼ teaspoon 0.7 g

Source

USDA measured 1 cup of cornstarch at 128 g. FoodData Central #169698. US cup = 236.6 ml. How you fill the cup changes the weight, so weigh ingredients for baking when you can.

Other flour & grains

All-purpose flour 1 cup = 125 g Bread flour 1 cup = 137 g Cake flour 1 cup = 137 g Whole wheat flour 1 cup = 120 g Self-rising flour 1 cup = 125 g Cornmeal 1 cup = 122 g Semolina 1 cup = 167 g Rolled oats 1 cup = 81 g White rice 1 cup = 185 g Brown rice 1 cup = 185 g Quinoa 1 cup = 170 g Couscous 1 cup = 173 g Lentils 1 cup = 192 g

All ingredients, cups to grams →

About the Unit Converter

The unit converter changes values between metric and imperial units for length, weight, temperature, digital data, area, and volume.

How to use it

1 Choose a category, such as length or temperature.
2 Pick the unit to convert from and the unit to convert to.
3 Type a value to see the converted result straight away.

Frequently asked questions

How many grams is 1 cup of cornstarch?

1 US cup of cornstarch weighs 128 g, as measured by the USDA (1 cup). A tablespoon weighs 8 g.

How do I convert grams of cornstarch to cups?

Divide the grams by 128. For example, 100 g of cornstarch is 0.78 cups, about 3/4 cup + 1 tbsp.

Is a US cup the same as a metric cup?

No. A US cup is 236.6 ml and a metric cup (Australia, Canada, New Zealand) is 250 ml, so a metric cup of an ingredient weighs about 5–6% more than the US weights here.

Why weigh instead of using cups?

How you fill a cup changes how much goes in: scooped flour packs down, spooned flour stays loose. Weighing gives the same amount every time, which matters most for baking.

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