Cornstarch, Cups to Grams & Grams to Cups
1 cup of cornstarch = 120 grams · 100g = 0.83 cups
Also known as corn flour.
Cornstarch (cornflour in the UK) is a fine, powdery thickener weighing about 120 grams per cup, though it is most often used a tablespoon at a time — roughly 8 grams each. It thickens sauces and pie fillings to a glossy clarity and keeps cookies tender. It must be cooked to lose its raw, starchy taste.
Recommended for accuracy
Digital kitchen scale
For cornstarch, weighing in grams beats scooping cups every time. This is the one tool worth owning.
Check price →
As an Amazon Associate, GramCups earns from qualifying purchases.
Cornstarch cups to grams table
| Cups | Grams | Ounces | Tablespoons |
|---|---|---|---|
| 1/8 | 15 g | 0.53 oz | 2 |
| 1/4 | 30 g | 1.06 oz | 4 |
| 1/3 | 40 g | 1.41 oz | 5.33 |
| 1/2 | 60 g | 2.12 oz | 8 |
| 2/3 | 80 g | 2.82 oz | 10.7 |
| 3/4 | 90 g | 3.17 oz | 12 |
| 1 | 120 g | 4.23 oz | 16 |
| 1 1/2 | 180 g | 6.35 oz | 24 |
| 2 | 240 g | 8.47 oz | 32 |
| 3 | 360 g | 12.7 oz | 48 |
Cornstarch grams to cups table
Working the other way? Here's how many cups common gram weights of cornstarch come to, handy when a recipe lists cornstarch in grams but you only have cup measures.
| Grams | Cups | Ounces | Tablespoons |
|---|---|---|---|
| 25 g | 0.21 | 0.88 oz | 3.33 |
| 50 g | 0.42 | 1.76 oz | 6.67 |
| 75 g | 0.62 | 2.65 oz | 10 |
| 100 g | 0.83 | 3.53 oz | 13.3 |
| 125 g | 1.04 | 4.41 oz | 16.7 |
| 150 g | 1.25 | 5.29 oz | 20 |
| 175 g | 1.46 | 6.17 oz | 23.3 |
| 200 g | 1.67 | 7.05 oz | 26.7 |
| 225 g | 1.88 | 7.94 oz | 30 |
| 250 g | 2.08 | 8.82 oz | 33.3 |
| 300 g | 2.5 | 10.6 oz | 40 |
| 350 g | 2.92 | 12.3 oz | 46.7 |
| 400 g | 3.33 | 14.1 oz | 53.3 |
| 500 g | 4.17 | 17.6 oz | 66.7 |
Cornstarch: US, metric & UK cups compared
A “cup” isn’t the same size everywhere, so 1 cup of cornstarch weighs a different number of grams depending on which cup your recipe uses. The US cup is 236.6 ml, while Australia, New Zealand, Canada and modern UK recipes use a 250 ml metric cup. Here’s 1 cup of cornstarch in each:
| Cup standard | Size | 1 cup cornstarch | Used in |
|---|---|---|---|
| US cup | 237 ml | 120 g | United States (most US recipe sites) |
| Metric cup | 250 ml | 127 g | Australia, NZ, Canada & modern UK |
| UK imperial cup | 284 ml | 144 g | Older British recipes |
| Japanese cup | 200 ml | 101 g | Japan |
Unless a recipe says otherwise, US recipes mean the US cup and Australian/UK recipes mean the 250 ml metric cup. The tables higher up this page use the US cup.
Related ingredients
Quick reference: Cornstarch in grams
- ⅛ cup cornstarch = 15g
- ¼ cup cornstarch = 30g
- ⅓ cup cornstarch = 40g
- ½ cup cornstarch = 60g
- ⅔ cup cornstarch = 80g
- ¾ cup cornstarch = 90g
- 1 cup cornstarch = 120g
- 2 cups cornstarch = 240g
How many cups is 100g, 200g or 300g of cornstarch?
Because one cup of cornstarch weighs about 120 grams, you can convert any weight to cups by dividing by 120. So 100g of cornstarch is about 0.83 cups, 200g is about 1.67 cups, 250g is about 2.08 cups, and 300g is about 2.5 cups. For any other amount, type the grams straight into the converter above and switch it to show cups.
How to measure cornstarch accurately
For the most reliable baking results, weigh cornstarch (also called corn flour) on a kitchen scale rather than scooping by volume. One US cup of cornstarch weighs about 120 grams (4.23 oz), but the exact figure changes with how tightly it's packed and the brand. Scooping straight from the bag compacts cornstarch and can leave you 15 to 20% over, so spoon it into the cup and level it off for the closest match to the figures above. Use the tables for quick reference, or the converter for any custom amount in cups, grams, ounces or tablespoons.
Tip: Mix cornstarch with a little cold liquid to make a slurry before adding it to anything hot; dumped in dry it clumps instantly. One tablespoon is about 8g.
Cornstarch conversions: common questions
How many grams is a tablespoon of cornstarch?
About 8 grams. A cup of cornstarch is roughly 120g, which works out to around 8g per level tablespoon.
How many grams are in a cup of cornstarch?
One US cup of cornstarch weighs approximately 120 grams (4.23 oz).
How many grams in half a cup of cornstarch?
Half a cup (½ cup) of cornstarch weighs approximately 60 grams.
How many grams in a quarter cup of cornstarch?
A quarter cup (¼ cup) of cornstarch weighs approximately 30 grams.
How do I convert cornstarch from cups to grams?
Multiply the number of cups by 120. For example, 2 cups of cornstarch = 240 grams, and ¾ cup = 90 grams.
How many cups is 100g of cornstarch?
100 grams of cornstarch is about 0.83 cups. 200g is about 1.67 cups and 300g is about 2.5 cups, since 1 cup weighs 120 grams.
How many grams in a metric (Australian) cup of cornstarch?
One 250 ml metric cup of cornstarch, used in Australia, New Zealand, Canada and modern UK recipes, weighs about 127 grams, compared with 120 grams for a 236.6 ml US cup.