If you’ve opened a British recipe and found cornflour on the ingredient list, you might reasonably head to an American supermarket looking for a bag labeled corn flour.
Don’t.
This is one of those deceptively small differences between British and American cooking terminology that can completely change a recipe.
In most British recipes, cornflour is what Americans call cornstarch: the very fine white starch commonly used to thicken custards, gravies, sauces and pie fillings. BBC Good Food explicitly notes that British cornflour is known as cornstarch in the United States. Tollbit
American products labeled corn flour, on the other hand, may be finely ground corn and are not automatically interchangeable with British cornflour.
So if you’re making a British recipe in an American kitchen, the translation you usually need is wonderfully simple:
British cornflour = American cornstarch.
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What Is Cornflour?
British cornflour is a very fine starch derived from corn.
It looks like an extremely fine, bright white powder and is particularly useful as a thickener.
King Arthur describes cornstarch as a fine white starch derived from corn that is frequently used for its thickening properties when heated. King Arthur Baking
That’s the ingredient a British recipe is generally asking for when it says cornflour.
You may see it used in:
- Custard
- Gravy
- Sauces
- Fruit fillings
- Puddings
- Cakes and biscuits
- Meringue-based desserts
BBC Good Food’s cornflour recipe collection similarly uses the ingredient in dishes including custard, cakes, meringues and sauces. Tollbit
What Is Cornflour Called in America?
In the United States, look for a package labeled:
Cornstarch
You’ll usually find it in the baking aisle alongside flour, baking powder and other baking ingredients.
So when you’re converting a British recipe for an American kitchen:
1 tablespoon British cornflour = 1 tablespoon American cornstarch
You don’t need to perform a complicated conversion simply because the ingredient has a different name.
Is Cornflour the Same as Cornstarch?
When comparing British cornflour with American cornstarch, yes—they refer to the same type of fine corn starch used for thickening.
This is primarily a terminology difference.
That distinction is important because the word flour can send an American cook looking for something that behaves much more like ordinary flour or finely ground cornmeal.
Is British Cornflour the Same as American Corn Flour?
This is where things become confusing.
No—not necessarily.
British cornflour refers to the extracted starch from corn.
In American usage, products described as corn flour can refer to finely milled corn rather than pure cornstarch.
Those products contain more of the corn rather than being the isolated white starch we’re looking for.
That means they behave differently in recipes.
If a British custard recipe asks you to add cornflour, buying a yellow corn flour product because the words appear to match is likely to give you a very different result.
Brit & Skillet Tip
Ignore the word “flour” for a moment and look at the ingredient itself.
If a British recipe calls for cornflour, the American package you want will normally say CORNSTARCH and contain a very fine white powder.
That one translation will save you from an awful lot of British-recipe confusion.
Cornflour vs. Cornmeal
Cornmeal is different again.
Cornmeal consists of ground dried corn and generally has considerably more texture than cornstarch.
It’s what you might use for cornbread, for dusting a pizza peel or as part of other corn-based dishes.
It is not a direct replacement for British cornflour when the cornflour is being used to thicken a custard, sauce or gravy.
What About Masa Harina?
Also different.
Masa harina is made from corn that has undergone a process called nixtamalization, in which the corn is treated with an alkaline solution before being ground and dried.
King Arthur notes that masa harina’s special treatment means neither cornmeal nor ordinary corn flour is a good substitute for it. King Arthur Baking
And the reverse applies to our problem: masa harina is not what a British recipe means when it asks for cornflour.
So we now have several corn products that sound frustratingly similar:
| British recipe term | What to buy in the US |
|---|---|
| Cornflour | Cornstarch |
| Cornmeal | Cornmeal |
| Polenta | Usually polenta or an appropriate cornmeal, depending on the recipe |
| Masa harina | Masa harina |
For ordinary British baking and cooking, that first row is the one to remember.
Why Is Cornflour Used in British Recipes?
Its most familiar job is thickening liquids.
When cornstarch is heated with sufficient liquid, its starch granules absorb water and swell, thickening the mixture.
That’s why you’ll find British cornflour in recipes for things such as gravy, custard and fruit fillings.
King Arthur’s baking guidance, for example, lists cornstarch among common fruit-pie thickeners. King Arthur Baking Shop
But thickening isn’t its only job.
Small amounts of cornstarch can also affect the texture of baked goods. King Arthur, for example, uses a mixture of all-purpose flour and cornstarch as a homemade substitute designed to approximate the tenderness of cake flour. King Arthur Baking
So if cornflour appears in a British cake or biscuit recipe, don’t automatically assume it’s there to make something gooey.
It may be contributing to the texture.
How Do You Thicken a Sauce With Cornflour?
One common British technique is to make a cornflour slurry.
Instead of tipping dry cornstarch straight into a hot sauce, mix it first with a small amount of cold liquid until smooth.
Then gradually stir that mixture into the hot liquid.
This helps prevent those unpleasant little white lumps that appear when dry starch hits hot liquid before it can disperse.
The mixture then needs to be heated according to the recipe so the starch can do its thickening work.
Why Did My Cornflour Go Lumpy?
Usually because it was added directly to a hot liquid.
The outside of the starch can hydrate and thicken before the inside has dispersed properly, leaving you chasing little lumps around the saucepan.
Make the cold slurry first.
It’s a tiny extra step that makes life considerably easier.
Can I Substitute Flour for Cornflour?
Sometimes, but it isn’t usually a straight one-for-one substitution.
All-purpose flour and cornstarch don’t have identical thickening properties and can produce different textures and appearances.
If a British recipe specifically calls for cornflour and you have access to ordinary American cornstarch, use the cornstarch.
There’s no reason to create a substitute when the correct ingredient is already sitting in most American supermarkets under a different name.
Is Cornflour Gluten-Free?
Pure cornstarch itself does not naturally contain gluten.
However, if you need to avoid gluten for medical reasons, check the labeling of the particular product you purchase for allergen information and possible cross-contact rather than assuming every brand has been processed identically.
How Should I Store Cornstarch?
Keep it tightly sealed in a cool, dry place.
Moisture is the enemy here.
Because cornstarch readily interacts with water, keeping the container dry and well sealed helps prevent clumping and contamination.
Is Cornflour the Same as Plain Flour?
No.
British plain flour corresponds broadly to American all-purpose flour, while British cornflour corresponds to American cornstarch.
Those are two completely different translations.
If British flour terminology is giving you a headache, my guide to Plain Flour vs. All-Purpose Flour explains that particular difference in much more detail.
And if your recipe asks for self-raising flour, see Self-Raising Flour vs. Self-Rising Flour before reaching for an American bag, because there are differences worth knowing there too.
Other British Ingredients That Confuse American Cooks
Cornflour is far from the only culprit.
British recipes can also introduce American cooks to unfamiliar terms such as golden syrup, black treacle, caster sugar and suet.
My British Baking Ingredients Americans Need to Know guide is a useful starting point for translating the pantry.
And if you’ve encountered suet in an old-fashioned pudding recipe, What Is Suet in America? explains exactly what you’re looking for.
The Easy Way to Remember It
You don’t need to memorize an entire dictionary of corn products.
For most British recipes, remember this:
If the recipe says CORNFLOUR, buy American CORNSTARCH.
Not cornmeal.
Not masa harina.
And don’t simply grab a package labeled corn flour because the name looks right.
Once you know that translation, one more confusing British ingredient becomes remarkably straightforward.
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