Flours & Starches
Cornstarch conversion chart
1 cup of cornstarch = 120 g = 4.23 oz. Convert any amount below, or use the reference charts for cups, tablespoons, grams and ounces.
1 cup of cornstarch =
120 g
- oz
- 4.23
- kg
- 0.12
- lb
- 0.265
- 1 cup
- 120 g
- 1 tablespoon
- 7.5 g
- 1 teaspoon
- 2.5 g
- 1 cup in ounces
- 4.23 oz
- 100 g in cups
- 0.833 cups
- Density
- 0.51 g/ml
Measuring note
Cornstarch compacts in the box. Stir it before measuring or a level cup can weigh 135 g.
Source: FAO / INFOODS density database
Cornstarch cups to grams chart
US cups converted to grams, ounces and millilitres. Fractions are written the way recipes write them.
| Cups (US) | Grams | Ounces (weight) | Millilitres |
|---|---|---|---|
| 1/8 cup | 15 g | 0.529 oz | 29.6 ml |
| 1/4 cup | 30 g | 1.06 oz | 59.1 ml |
| 1/3 cup | 40 g | 1.41 oz | 78.9 ml |
| 1/2 cup | 60 g | 2.12 oz | 118 ml |
| 2/3 cup | 80 g | 2.82 oz | 158 ml |
| 3/4 cup | 90 g | 3.17 oz | 177 ml |
| 1 cup | 120 g | 4.23 oz | 237 ml |
| 1 1/2 cup | 180 g | 6.35 oz | 355 ml |
| 2 cup | 240 g | 8.47 oz | 473 ml |
| 3 cup | 360 g | 12.7 oz | 710 ml |
| 4 cup | 480 g | 16.9 oz | 946 ml |
Tablespoons and teaspoons
1 tbsp ≈ 7.5 g · 1 tsp ≈ 2.5 g
| Tablespoons (US) | Grams | Cups (US) |
|---|---|---|
| 1 tbsp | 7.5 g | 0.063 cup |
| 2 tbsp | 15 g | 0.125 cup |
| 3 tbsp | 22.5 g | 0.188 cup |
| 4 tbsp | 30 g | 0.25 cup |
| 5 tbsp | 37.5 g | 0.313 cup |
| 6 tbsp | 45 g | 0.375 cup |
| 8 tbsp | 60 g | 0.5 cup |
| 10 tbsp | 75 g | 0.625 cup |
| 12 tbsp | 90 g | 0.75 cup |
| 16 tbsp | 120 g | 1 cup |
Grams back to cups
Useful when a metric recipe gives grams but you only own cups.
| Grams | Cups (US) | Tablespoons (US) |
|---|---|---|
| 10 g | 0.083 cup | 1.33 tbsp |
| 25 g | 0.208 cup | 3.33 tbsp |
| 50 g | 0.417 cup | 6.67 tbsp |
| 75 g | 0.625 cup | 10 tbsp |
| 100 g | 0.833 cup | 13.3 tbsp |
| 125 g | 1.04 cup | 16.7 tbsp |
| 150 g | 1.25 cup | 20 tbsp |
| 200 g | 1.67 cup | 26.7 tbsp |
| 250 g | 2.08 cup | 33.3 tbsp |
| 500 g | 4.17 cup | 66.7 tbsp |
| 1000 g | 8.33 cup | 133 tbsp |
Single-conversion pages for cornstarch
Working with cornstarch
Cornstarch sits in the flours & starches group, where a cup lands in the same range as water, but the material still compacts differently depending on how you fill the cup. Cornstarch compacts in the box. Stir it before measuring or a level cup can weigh 135 g.
If you are converting a whole recipe rather than a single line, the Recipe to Metric converter matches every ingredient to its own density in one pass, and the Recipe Scaler resizes the batch first so you only convert once.
Also sold as: corn flour, cornflour. These names refer to the same product and use the same weight per cup.
Frequently asked questions
How many grams are in a cup of cornstarch?
One US cup of cornstarch weighs about 120 grams (4.23 oz). Cornstarch compacts in the box. Stir it before measuring or a level cup can weigh 135 g.
How many grams are in a tablespoon of cornstarch?
One US tablespoon holds about 7.5 g, and one teaspoon about 2.5 g, since a tablespoon is 14.79 ml and a teaspoon 4.93 ml.
How many cups is 100 g of cornstarch?
100 grams of cornstarch is roughly 0.833 US cups. Weighing is more reliable than filling a cup, especially for flours & starches.
Where does this figure come from?
The density used here is 0.507 g/ml, based on FAO / INFOODS density database. Treat it as an approximation: real batches vary with brand, moisture and how the cup is filled.