Convert cups of cornstarch to grams instantly. Enter a value below, or use the formula and reference table further down the page.
In practice
Cornstarch is pure starch, so it thickens liquids without adding flavour or colour, and a cup weighs about 128 g here. It needs to reach a gentle boil to thicken fully, producing a glossy, translucent sauce — perfect for stir-fry sauces, pie fillings and custard. Always mix it with cold liquid first to avoid lumps, and avoid boiling it hard for long, since starch can break down and thin the sauce. In the UK it is called cornflour, which can confuse American readers, as 'corn flour' in the US means finely ground cornmeal.
How to convert cups of cornstarch to grams
Multiply the value by 128.
g = cup × 128Example: 10 cup = 1280 g.
Cups of Cornstarch to Grams conversion table
| Cups of Cornstarch (cup) | Grams (g) |
|---|---|
| 1 cup | 128 g |
| 2 cup | 256 g |
| 3 cup | 384 g |
| 4 cup | 512 g |
| 5 cup | 640 g |
| 10 cup | 1280 g |
| 15 cup | 1920 g |
| 20 cup | 2560 g |
| 25 cup | 3200 g |
| 50 cup | 6400 g |
| 100 cup | 12800 g |
Frequently asked questions
How many grams is 1 cup of cornstarch?
1 cup of cornstarch equals 128 grams.
What is the formula to convert cup to g?
To convert cup to g, multiply the value by 128. The full formula is: g = cup × 128.
How do I convert grams back to cups of cornstarch?
Use the same calculator above and type your value into the grams field instead — it converts in both directions. Or use the reverse formula: cup = g ÷ 128.
Is the cup to g conversion exact?
The conversion factor used here (128) is the standard internationally defined value. Results on this page are rounded to four decimal places for readability.