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Ounces to Cups — Cornflour / Cornstarch
Converts ounce of cornflour / cornstarch to us cup using its real density, not a generic volume factor. One ounce is 0.236246026 us cup.
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In short
One ounce of cornflour / cornstarch is 0.236246026 us cup. Going the other way, one us cup is 4.2328754339 ounce. That works out at 2 ounce = 0.4724920521 us cup and 4 = 0.9449841042. 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 Ounces 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 Ounces 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 ounce to us cup for cornflour / cornstarch, the amounts that come up most often are: 1/4 ounce = 0.059 us cup; 1/2 ounce = 0.118 us cup; 3/4 ounce = 0.177 us cup; 1 ounce = 0.236 us cup; 1 1/2 ounce = 0.354 us cup; 2 ounce = 0.472 us cup; 2 1/2 ounce = 0.591 us cup; 3 ounce = 0.709 us cup; 5 ounce = 1.18 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 Ounce | 0.236246026 US cup |
| 1 US cup | 4.2328754339 Ounce |
| 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 = ounce × 0.236246026, 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.
Do I need an account to use the Ounces to Cups — Cornflour / Cornstarch?
There is no cost and no cap. The Ounces to Cups — Cornflour / Cornstarch is not a demo of a paid product, so nothing is held back or watermarked.
Is the Ounces to Cups — Cornflour / Cornstarch safe to use with private information?
No. The Ounces 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.
What formula does the Ounces to Cups — Cornflour / Cornstarch use?
It uses us cup = ounce × 0.236246026, 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.
Give me a worked example.
Enter 2 ounce of cornflour / cornstarch and the Ounces to Cups — Cornflour / Cornstarch returns 0.4724920521 us cup.
When would I actually need the Ounces to Cups — Cornflour / Cornstarch?
Typical uses: 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.
When is the Ounces to Cups — Cornflour / Cornstarch not the right tool?
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.
Which values should I know?
1 US cup of cornflour / cornstarch is 120 g. 1 Ounce is 0.236246026 US cup. 1 US cup is 4.2328754339 Ounce. These are printed on the page itself, so you do not have to take them on trust.
Can I rely on this for exact work?
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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