Where Cornstarch shines
- Pie fillings, fruit sauces, puddings, and custard-style fillings.
- Cake flour-style blends where you want a more tender crumb.
- Recipes that need thickening without the cloudy look of flour.
Pure starch extracted from corn. Primary use as a thickener and tenderiser.
Cornstarch pulls double duty in baking: it thickens liquids and can soften texture when blended with flour. Because it is pure starch, small changes can quickly shift set, gloss, and chew.
Also Called
corn flour
Properties
Density Index
0.54 g/cm3
1 Cup Weight
128g
Texture
Dry
Category
Baking
Top Substitute
Arrowroot Powder
Use 1:1
Very similar behaviour. Better for acid-based and frozen sauces.
Most-used links for Cornstarch
What to watch
- Too much cornstarch can turn a filling gummy or chalky once cooled.
- It does not replace flour 1:1 for thickening strength or structure.
- Starch slurries need full heat and enough liquid to gelatinize cleanly.
Conversions
| cups | grams |
|---|---|
| 1/4 cups | 31.9 grams |
| 1/3 cups | 42.2 grams |
| 1/2 cups | 63.9 grams |
| 1 cups | 128 grams |
| 1.50 cups | 192 grams |
| 2 cups | 256 grams |
| 3 cups | 383 grams |
| 4 cups | 511 grams |
Density: 0.54 g/ml
Quick Convert
Ingredient-specific, density-based conversions for baking
128
gramsIngredient-specific · density-based
Density-specific references, not generic cup charts · NIST-DB-72
Recommended Tools & Pantry Picks for Cornstarch
Optional shopping references for bakers who want to compare tools and pantry options related to cornstarch.
Digital Kitchen Scale
Essential for cup-to-gram accuracy and repeatable bakes.
Shop scales ↗Measuring Cup & Spoon Set
Useful for quick volume checks before converting to weight.
Shop measuring sets ↗Disclosure: Some outbound links are affiliate links. As an Amazon Associate, CupOrGram earns from qualifying purchases. Learn more.
Substitutions for Cornstarch
Arrowroot Powder
excellent1:1
Very similar behaviour. Better for acid-based and frozen sauces.
Very similar behaviour. Better for acid-based and frozen sauces.
Tapioca Starch
goodUse 2 tbsp tapioca per 1 tbsp cornstarch
Creates chewier, more elastic texture. Good for pie fillings.
Creates chewier, more elastic texture. Good for pie fillings.
All-Purpose Flour
goodUse 2 tbsp flour per 1 tbsp cornstarch
Half the thickening power. Creates opaque, less glossy results.
Half the thickening power. Creates opaque, less glossy results.
Storage Tips
Cool, dry place. Indefinite shelf life if kept dry.
Baking Science
Thickens by gelatinizing starch granules when heated with liquid. Twice the thickening power of flour. Creates clear, glossy sauces.
Recipe Notes
Pie Filling
Cornstarch gives a glossy set, but the filling can thin out if the fruit is especially juicy or the starch is undercooked.
Cake Flour Substitute
A small amount mixed with all-purpose flour lowers the effective protein and helps cakes bake more tenderly.
Cookies
In some cookie formulas, a little cornstarch softens the center and reduces toughness from too much gluten development.
Common Pitfalls
- Switching brands without re-checking weight can change texture and bake time.
- Using volume-only measurements for dense ingredients can overshoot recipe targets.
- Expired leaveners can underperform even when measured correctly.
Brand Variance & Measuring Method
Baseline reference: 1 cup cornstarch = 128g. In real kitchens, a practical range is usually 120g-136g per cup (6% band).
Why this happens: fine powders and leaveners settle during storage, changing cup density.
Common Questions
Is cornstarch the same as flour?
No. Cornstarch is pure starch, so it thickens more strongly and does not provide the structure that flour does.
Can I use cornstarch to make flour feel lighter in cakes?
Yes. A small amount blended with all-purpose flour is a common way to approximate a softer cake flour mix.
Why does cornstarch clump in recipes?
It clumps when dry starch hits hot liquid directly. Mixing it into a slurry first makes it much easier to disperse.
How many grams is 1 cup of cornstarch?
1 cup of cornstarch weighs 128 grams.