Cornstarch Grams to Cups Converter
Convert cornstarch from grams to cups using ingredient-specific baking measurements.
100 grams of cornstarch ≈
0.78US cups
About ¾ cup
Based on 1 US cup of cornstarch = 128g
Data last verified: August 5, 2026
Convert grams to cups
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100 grams of Cornstarch =
0.78US cups
Approximately ¾ cup
Based on 1 US cup of Cornstarch = 128g
1 US cup of Cornstarch = 128g
Measured spooned lightly and leveled (dry, unsifted, lumps broken up, based on the US cup / 240 ml)
Cornstarch grams to cups conversion table
| Grams | Cups |
|---|---|
| 10g | 0.08 cups |
| 15g | 0.12 cups |
| 20g | 0.16 cups |
| 25g | 0.20 cups |
| 30g | 0.23 cups |
| 40g | 0.31 cups |
| 50g | 0.39 cups |
| 75g | 0.59 cups |
| 100g | 0.78 cups |
| 125g | 0.98 cups |
| 150g | 1.17 cups |
| 200g | 1.56 cups |
| 250g | 1.95 cups |
Kitchen fraction approximation
Sources & how they compare
| Source | Reported value | Comparable source-cup value | Type | Measurement method | Adopted here | Checked |
|---|---|---|---|---|---|---|
| USDA FoodData Central — Cornstarch (FDC 169698)FDC ID: 169698 | 128 g/1 source cup (exact volume unknown) | 128g | Direct | household cup; packing not specified | Adopted | 2026-08-05 |
| King Arthur Baking — Ingredient Weight Chart | 28 g/1/4 source cup (exact volume unknown) | 112g | Derived | spooned and leveled | 2026-08-05 |
A comparable source-cup value only scales a half-cup or tablespoon serving to one source cup. When a source does not state the cup's exact volume, we do not present it as a fixed-milliliter normalization.
Measurement notes
- Cornstarch compacts easily, so break up lumps before filling the cup.
- Spoon it in lightly and level once; tapping the cup can make the same volume heavier.
- In the UK and some other regions, cornflour means cornstarch; elsewhere corn flour can mean finely milled whole corn.
Common mistakes
- Not measuring cornstarch the recommended way — spooned lightly and leveled — is one of the most common sources of error.
- Assuming 1 cup of cornstarch equals 240g like water — it is actually 128g per US cup.
- Packing the powder into the cup instead of spooning it in and leveling.
Related amount conversions
Frequently asked questions
How many cups is 100 grams of cornstarch?
100 grams of cornstarch is about 0.78 cups, based on 1 US cup (240 ml) = 128g.
How many grams are in 1 cup of cornstarch?
1 US cup of cornstarch is about 128 grams, measured spooned lightly and leveled.
Does 1 cup of cornstarch weigh the same in a metric cup?
No. A metric cup (250 ml) holds slightly more than a US cup (240 ml), so 1 metric cup of cornstarch is about 133.3g, compared with 128g in a US cup.
What's the best way to measure cornstarch accurately?
For the most accurate result, spooned lightly and leveled, and use a kitchen scale when your recipe calls for a precise weight.
Can I convert cups of cornstarch back to grams?
Yes, use the Cups to Grams tool with cornstarch selected to convert any cup amount back into grams.
Why does cornstarch convert differently from other ingredients?
Grams measure weight and cups measure volume, so the conversion depends on how dense cornstarch is. A cup of cornstarch weighs 128g, while a denser or lighter ingredient weighs a different amount per cup.
Where do these numbers come from?
See how we measure ingredient density and verify each grams-per-cup value.