How Much Is 40 Grams of Cornstarch in Cups?
40 grams of cornstarch equals 0.31 cups. Cornstarch has a density of 128g per cup. A lighter ingredient like cocoa powder (86g/cup) would fill even more volume at the same weight, which is why ingredient-specific conversions matter.
Formula and Step-by-Step
- Start with 40 grams of cornstarch
- 1 cup of cornstarch = 128g
- 40g ÷ 128g/cup = 0.31 cups
The same formula works for any amount. Multiply (or divide) by the density, then convert units as needed.
Measuring Tip
Different flour types have very different weights per cup. Always check the specific flour your recipe calls for rather than using a generic "flour" conversion.
Cornstarch at Different Amounts
How cornstarch scales across common grams measurements. Your amount (40 grams) is highlighted.
Other Amounts of Cornstarch
| Grams | US Cups | Metric Cup | Imperial Cup |
|---|---|---|---|
| 5 grams | 0.04 cups | 0.04 cups | 0.03 cups |
| 10 grams | 0.08 cups | 0.07 cups | 0.07 cups |
| 25 grams | 0.20 cups | 0.18 cups | 0.16 cups |
| 40 grams | 0.31 cups | 0.30 cups | 0.26 cups |
| 50 grams | 0.39 cups | 0.37 cups | 0.33 cups |
| 75 grams | 0.59 cups | 0.55 cups | 0.49 cups |
| 100 grams | 0.78 cups | 0.74 cups | 0.65 cups |
| 150 grams | 1.17 cups | 1.11 cups | 0.98 cups |
| 200 grams | 1.56 cups | 1.48 cups | 1.30 cups |
| 250 grams | 1.95 cups | 1.85 cups | 1.63 cups |
| 500 grams | 3.91 cups | 3.70 cups | 3.25 cups |
Understanding the Units
What is a Gram?
Grams are the preferred unit in professional kitchens and bakeries because they allow exact recipe scaling. To double a recipe, simply double the gram values. No need to worry about how tightly an ingredient is packed into a cup.
What is a Cup?
A cup is a US customary unit of volume equal to 236.588 milliliters or 8 fluid ounces. It is the most common volume measurement in American recipes. One cup can be divided into 16 tablespoons or 48 teaspoons.