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Cooking conversion
Cups of Cornstarch to Ounces
How many ounces are in cups of cornstarch? Type a value below to see the result instantly. Cooking conversions depend on the density of each ingredient — the math here uses 0.541 g/mL for cornstarch.
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1 cup of cornstarch = 4.5149 oz
Cups of Cornstarch to Ounces Conversion Table
Common values for cornstarch:
| Cups of cornstarch | Ounces |
|---|---|
| 0.25 cup | 1.1287 oz |
| 0.5 cup | 2.2574 oz |
| 1 cup | 4.5149 oz |
| 2 cup | 9.0297 oz |
| 3 cup | 13.5446 oz |
| 4 cup | 18.0594 oz |
| 5 cup | 22.5743 oz |
| 8 cup | 36.1189 oz |
| 10 cup | 45.1486 oz |
How this works
Cornstarch has a density of about 0.541 g/mL (king arthur baking: 1 cup = 128g). That means 1 mL of cornstarch weighs 0.541 grams.
Ounces = cups × 4.5149
Note: Spooned and leveled.
Why a cup of cornstarch doesn't always weigh the same
Volume measurements are forgiving in some ways and brutal in others. A cup of cornstarch can vary by 10-20% in weight depending on how it's measured: spooned vs scooped, packed vs loose, sifted vs unsifted. The density figure used here matches the most common published recipe conventions, but if you're after baking precision, weighing on a kitchen scale is more accurate than measuring by volume.