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Length Converter
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Grams to Cups — Cornflour / Cornstarch
Converts gram of cornflour / cornstarch to us cup using its real density, not a generic volume factor. One gram is 0.0083333333 us cup.
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In short
One gram of cornflour / cornstarch is 0.0083333333 us cup. Going the other way, one us cup is 120 gram. That works out at 2 gram = 0.0166666667 us cup and 4 = 0.0333333333. The figure comes from cornflour / cornstarch weighing 120 g per US cup — a generic cups-to-grams converter assumes water and will give you the wrong answer here, because volume to weight depends entirely on what is in the cup.
How to use the Grams to Cups — Cornflour / Cornstarch
- Type the value you want to convert.
- Pick the unit you are converting from and the unit you want.
- The converted value and the exact conversion factor are shown instantly.
About the Grams to Cups — Cornflour / Cornstarch
Cornflour is a fine powder that settles hard in the box, so it is worth stirring before measuring. Because it is used in small quantities as a thickener, a proportional error here shows up quickly — a sauce thickened with 20% too much cornflour turns gluey rather than glossy. The same ingredient is called cornflour in the UK and cornstarch in the US, which is a common recipe trap. The figure this page works from is 120 g per US cup, the spooned-and-levelled weight recorded by King Arthur Baking and the USDA food database. Converting gram to us cup for cornflour / cornstarch, the amounts that come up most often are: 25 gram = 0.208 us cup; 50 gram = 0.417 us cup; 75 gram = 0.625 us cup; 100 gram = 0.833 us cup; 150 gram = 1.25 us cup; 200 gram = 1.67 us cup; 250 gram = 2.08 us cup; 500 gram = 4.17 us cup; 1000 gram = 8.33 us cup.
What people use it for
- Following a US recipe with a kitchen scale instead of cup measures.
- Scaling a recipe up or down without compounding measuring error.
- Converting a European recipe written in grams into cups.
Details
| 1 US cup of cornflour / cornstarch | 120 g |
|---|---|
| 1 Gram | 0.0083333333 US cup |
| 1 US cup | 120 Gram |
| Worth knowing | The same ingredient is called cornflour in the UK and cornstarch in the US, which is a common recipe trap. |
The maths behind it
This tool uses us cup = gram × 0.0083333333, derived from cornflour / cornstarch weighing 120 g per US cup. Every intermediate value is shown on screen, so the result can be checked by hand.
Cornflour is a fine powder that settles hard in the box, so it is worth stirring before measuring. Because it is used in small quantities as a thickener, a proportional error here shows up quickly — a sauce thickened with 20% too much cornflour turns gluey rather than glossy.
Where this tool stops
Volume-to-weight conversion is inherently approximate. Humidity, brand, how finely something is milled and how long it has sat in the cupboard all shift the figure by a few per cent.
Frequently asked questions
Is cornflour the same as corn flour?
Not always, and this catches people out. In the UK, cornflour is the white starch thickener. In the US, "corn flour" can mean finely ground cornmeal, which is a completely different yellow ingredient. If a recipe uses it to thicken a sauce, it means the starch.
Why does a cup of cornflour / cornstarch not weigh the same as a cup of water?
Because a cup measures volume and a scale measures weight, and the two only agree for water. Cornflour / cornstarch has its own density — 120 g per US cup — so any generic volume converter gives the wrong answer here.
How much does the way I fill the cup matter?
Quite a lot. Cornflour is extremely fine and compacts readily, so a scooped cup runs well above the 120 g here. Since it is almost always used as a thickener in small quantities, the proportional error is what bites — a heaped tablespoon instead of a level one is the usual cause of a gluey sauce.
Is a US cup the same as a UK or metric cup?
No. A US cup is 236.6 ml, a metric cup is 250 ml and an old UK cup is 284 ml. These pages use the US cup, because that is what US recipes mean.
Is the Grams to Cups — Cornflour / Cornstarch free?
Free, unlimited, and no email address required. You can use it a hundred times a day and nothing changes.
Does anything I enter leave my computer?
No. The Grams to Cups — Cornflour / Cornstarch runs entirely in your browser using JavaScript. Nothing is transmitted, logged or stored, which you can verify yourself in the Network tab of your browser's developer tools.
How is the result calculated?
It uses us cup = gram × 0.0083333333, derived from cornflour / cornstarch weighing 120 g per US cup. The full working is printed under the result, so you can follow every step rather than trusting a black box.
What do I get if I try it?
Enter 2 gram of cornflour / cornstarch and the Grams to Cups — Cornflour / Cornstarch returns 0.0166666667 us cup.
What problem does the Grams to Cups — Cornflour / Cornstarch solve?
The jobs it is built for: following a US recipe with a kitchen scale instead of cup measures. Scaling a recipe up or down without compounding measuring error. Converting a European recipe written in grams into cups. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
Where does the Grams to Cups — Cornflour / Cornstarch stop being reliable?
Volume-to-weight conversion is inherently approximate. Humidity, brand, how finely something is milled and how long it has sat in the cupboard all shift the figure by a few per cent. Knowing where a tool stops being trustworthy matters more than the cases where it works.
What are the key numbers for the Grams to Cups — Cornflour / Cornstarch?
1 US cup of cornflour / cornstarch is 120 g. 1 Gram is 0.0083333333 US cup. 1 US cup is 120 Gram. These are printed on the page itself, so you do not have to take them on trust.
Is the number rounded?
The calculation runs in double precision and the result is shown to ten significant figures, so converting a value and converting it back returns the original. What is displayed is rounded for readability; what is copied is not.
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