| US cup amount | Weight |
|---|---|
| 1/8 cup | 14 g |
| 1/4 cup | 28 g |
| 1/3 cup | 38 g |
| 1/2 cup | 56 g |
| 3/4 cup | 85 g |
| 1 cup | 113 g |
| 1 1/2 cups | 170 g |
| 2 cups | 226 g |
Cornstarch Grams to Cups
1 US cup of cornstarch weighs 113 grams, the same as a cup of powdered sugar. It is a very light powder that compacts easily, so how you fill the cup matters.
Use the converter and charts below for cornstarch, spooned and levelled.
Grams to Cups Converter
Choose the ingredient before converting because every ingredient has a different weight per cup.
Grams to Cups Converter
Results use the documented ingredient state and one US customary cup.
Divide the gram amount by 113 to calculate US cups. The practical fraction is a measuring aid, not a replacement for the exact gram weight.
| Grams | US cups | Practical reference |
|---|---|---|
| 25 g | 0.22 cups | about 1/4 cup |
| 30 g | 0.27 cups | about 1/4 cup |
| 40 g | 0.35 cups | about 1/3 cup |
| 50 g | 0.44 cups | about 1/2 cup |
| 60 g | 0.53 cups | about 1/2 cup |
| 75 g | 0.66 cups | about 2/3 cup |
| 80 g | 0.71 cups | about 3/4 cup |
| 100 g | 0.88 cups | about 1 cup |
| 120 g | 1.06 cups | about 1 cup |
| 125 g | 1.11 cups | about 1 1/8 cups |
| 150 g | 1.33 cups | about 1 1/3 cups |
| 200 g | 1.77 cups | about 1 3/4 cups |
| 250 g | 2.21 cups | about 2 1/4 cups |
| 300 g | 2.65 cups | about 2 2/3 cups |
| 400 g | 3.54 cups | about 3 1/2 cups |
| 500 g | 4.42 cups | about 4 1/2 cups |
Spoon it into the cup and level with a straight edge. Cornstarch settles hard in the box and scooping directly can add a fifth again to the weight, which will make a sauce claggy.
Grams = cups × 113
One cup is 113 grams, one-half cup is about 56 grams and one-quarter cup is about 28 grams.
Common uses
- Oatmeal and overnight oats
- Granola
- Cookies and crumble toppings
Thickeners are not swapped one for one. They differ in weight per cup and in thickening power, so a substitution needs both adjusted.
| Type | Grams per US cup | What changes |
|---|---|---|
| Cornstarch | 113 g | The reference on this page. |
| Arrowroot powder | 128 g | Similar power, slightly heavier per cup. |
| Tapioca starch | 120 g | Gives a glossier, stretchier set. |
| Potato starch | 160 g | Noticeably denser per cup. |
| All-purpose flour | 120 g | About half the thickening power of cornstarch. |
Flour thickens at roughly half the strength of cornstarch, so replacing one tablespoon of cornstarch takes about two tablespoons of flour.
Comparison figures are typical published US baking references. Only the cornstarch value above is part of this site's sourced dataset.
Called cornflour in the UK, which is a different product from US cornmeal. The value on this page names the exact product state it applies to, so you can check it against your own ingredient rather than trusting a bare number.
The converter does not assume that every cup weighs 237 or 250 grams. It uses the documented value for the exact ingredient and state selected.
If a product label or recipe publisher supplies a different gram weight for one cup, follow that recipe-specific value for the closest match to the original testing.
Method and source
How this conversion was checked
This page uses 113 grams per US cup for cornstarch, spooned and levelled. Called cornflour in the UK, which is a different product from US cornmeal.
Primary reference: King Arthur Baking Ingredient Weight Chart
Cup standard: NIST US customary cup reference
How many grams are in one cup of cornstarch?
One US cup of cornstarch, spooned and levelled weighs 113 grams.
How many cups is 100 grams of cornstarch?
100 grams of cornstarch is 0.88 US cups.
How many grams is half a cup of cornstarch?
Half a US cup is about 56 grams using the 113 gram full-cup reference.
Is cornstarch the same as cornflour?
In the UK and Australia, yes: cornflour means cornstarch. In the US, cornflour is finely ground cornmeal, which is a completely different product.
How many grams is a tablespoon of cornstarch?
About 7 grams, spooned in and levelled.
Are these US cups or metric cups?
The results use a US customary cup of 236.588 millilitres. A metric cup is 250 millilitres and gives a different answer.
Other Ingredient Guides
Each guide uses its own grams-per-cup standard.