Grains and starches
Cornstarch: Cups to Grams
One US cup of cornstarch weighs 112 g, which is 3.95 oz, by the King Arthur Baking ingredient weight chart. A tablespoon is 7 g and a teaspoon 2.33 g. A 250 ml metric cup holds 118 g. To go the other way, 100 g of cornstarch is 3/4 cup plus 2 tablespoons plus 3/4 teaspoon.
Weight
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Cornstarch conversion chart
| Measure | Grams | Ounces |
|---|---|---|
| 1 teaspoon | 2.33 g | 0.08 oz |
| 1 tablespoon | 7 g | 0.25 oz |
| 1/8 cup | 14 g | 0.49 oz |
| 1/4 cup | 28 g | 0.99 oz |
| 1/3 cup | 37.3 g | 1.32 oz |
| 1/2 cup | 56 g | 1.98 oz |
| 2/3 cup | 74.7 g | 2.63 oz |
| 3/4 cup | 84 g | 2.96 oz |
| 1 cup | 112 g | 3.95 oz |
| 1 1/2 cups | 168 g | 5.93 oz |
| 2 cups | 224 g | 7.9 oz |
| 3 cups | 336 g | 11.9 oz |
| 4 cups | 448 g | 15.8 oz |
Grams of cornstarch to cups
| Weight | Cups, decimal | Nearest kitchen measure |
|---|---|---|
| 25 g | 0.22 | 3 tablespoons plus 1 3/4 teaspoons |
| 50 g | 0.45 | 1/3 cup plus 1 tablespoon plus 2 1/2 teaspoons |
| 75 g | 0.67 | 2/3 cup |
| 100 g | 0.89 | 3/4 cup plus 2 tablespoons plus 3/4 teaspoon |
| 125 g | 1.12 | 1 cup plus 1 tablespoon plus 2 1/2 teaspoons |
| 150 g | 1.34 | 1 1/3 cups |
| 200 g | 1.79 | 1 3/4 cups plus 1 3/4 teaspoons |
| 250 g | 2.23 | 2 1/4 cups |
| 500 g | 4.46 | 4 1/2 cups |
Where the figure comes from
The weight on this page is from the King Arthur Baking ingredient weight chart, which lists cornstarch as 1/4 cup = 28 g. Scaled to one US cup of 236.59 ml, that is 112 g. Every other number on the page is that figure multiplied or divided.
grams = cups x 112
cups = grams / 112
For example, 1 1/2 cups of cornstarch is 1.5 x 112 = 168 g, and 300 g is 300 / 112 = 2.68 cups.
How cornstarch compares by the cup
A cup measures volume, so its weight depends on what fills it. A cup of cornstarch is 50.7 percent lighter than a cup of water (227 g). It is 6.67 percent lighter than a cup of all-purpose flour (120 g).
Other grains and starches from the same chart, per US cup:
- Long grain rice, dry: 198 g, 86 g more than cornstarch
- Cornmeal: 138 g, 26 g more than cornstarch
- Rolled oats: 89 g, 23 g less than cornstarch
Nutrition in a cup of cornstarch
These figures apply USDA FoodData Central values for cornstarch to the 112 g cup used on this page.
| Nutrient | Per tablespoon | Per cup | Per 100 g |
|---|---|---|---|
| Calories | 27 kcal | 427 kcal | 381 kcal |
| Total fat | 0 g | 0.06 g | 0.05 g |
| Saturated fat | 0 g | 0.01 g | 0.01 g |
| Carbohydrate | 6.39 g | 102 g | 91.3 g |
| Fiber | 0.06 g | 1.01 g | 0.9 g |
| Total sugars | 0 g | 0 g | 0 g |
| Protein | 0.02 g | 0.29 g | 0.26 g |
| Sodium | 1 mg | 10 mg | 9 mg |
The two sources do not agree on what a cup weighs. USDA lists a cup of this food at 128 g, which is 16 g more than the 112 g in the baking chart. Products and the way a cup is filled both differ, which is the reason a recipe that gives grams is easier to repeat than one that gives cups. This page uses the baking chart figure throughout.
US cup or metric cup
A US cup is 236.59 ml and a metric cup, used in Australia, New Zealand and Canada, is 250 ml. The metric cup is 5.7 percent larger, so it holds 118 g of cornstarch against 112 g. Tablespoons and teaspoons on this page are US spoons. The calculator above has a switch for the cup size.
Frequently asked questions
How many grams is 1 cup of cornstarch?
112 g, or 3.95 oz, for a US cup of 236.59 ml. A metric cup of 250 ml holds 118 g.
How many grams is a tablespoon of cornstarch?
7 g. A teaspoon is 2.33 g. There are 16 tablespoons in a US cup, so the figure is the cup weight of 112 g divided by 16.
How many cups is 100 grams of cornstarch?
3/4 cup plus 2 tablespoons plus 3/4 teaspoon: 100 g divided by 112 g per cup is 0.89 cup. 250 g is 2.23 cups.
How many grams is half a cup of cornstarch?
56 g. A quarter cup is 28 g and a third of a cup is 37.3 g.