Yes, you can use all-purpose flour instead of cake flour by removing two tablespoons of flour per cup and adding two tablespoons of cornstarch to lower the protein content.
You are ready to bake. The oven is preheating, the butter is soft, and the mixer is out. Then you read the ingredient list and see “cake flour.” You check your pantry and only see a bag of standard all-purpose flour. This is a common kitchen hurdle, but it does not mean you have to abandon your recipe or run to the store.
The difference between these flours comes down to protein. Understanding how that protein changes the texture of your baked goods allows you to manipulate what you have on hand to get the results you want. You can create a nearly identical substitute in seconds with a simple pantry staple.
Making Your Own Cake Flour Substitute
You do not need complex equipment to mimic the texture of store-bought cake flour. The goal is to reduce the protein density of your all-purpose flour so it behaves more like the soft, low-protein wheat used for cakes.
Follow this method for one cup of substitute:
- Measure one level cup of all-purpose flour.
- Remove two tablespoons of the flour and return it to the bag.
- Add two tablespoons of cornstarch (corn flour) to the cup.
- Sift the mixture together at least twice to ensure the cornstarch is evenly distributed.
This process cuts the gluten potential of the flour. Cornstarch creates a tender structure rather than a chewy one. Sifting is the step you cannot skip here. It aerates the mixture and ensures you do not end up with clumps of pure starch in your batter.
Can I Use All Purpose Flour Instead Of Cake Flour?
The short answer is yes. Most home bakers ask, “can i use all purpose flour instead of cake flour?” because they want to know if the recipe will fail without the specialty ingredient. It will not fail. However, the texture will shift slightly depending on how sensitive the recipe is.
Cake flour is milled from soft wheat and typically contains 6% to 8% protein. All-purpose flour comes from a mix of hard and soft wheat, sitting around 10% to 12% protein. That extra protein creates gluten when you add liquid and mix the batter. Gluten makes bread chewy and crusty, which is great for a loaf of sourdough but bad for a delicate angel food cake.
When you make the swap without adding cornstarch, your cake may have a tighter crumb. It might feel slightly heavier on the tongue. For hearty cakes like carrot cake or banana bread, you might not notice the difference at all. For light sponges, the cornstarch hack is necessary to keep things airy.
Comparing Flour Protein And Uses
To understand why the swap works, it helps to see where different flours sit on the protein spectrum. The lower the protein, the less gluten develops during mixing.
| Flour Variety | Approximate Protein % | Primary Use Case |
|---|---|---|
| Cake Flour | 6% – 8% | Angel food cake, chiffon, sponges |
| Pastry Flour | 8% – 9% | Pie crusts, biscuits, tart shells |
| Southern Bleached AP | 8% – 10% | Biscuits, pancakes, quick breads |
| Standard All-Purpose | 10% – 12% | Cookies, muffins, waffles |
| Bread Flour | 12% – 14% | Yeast breads, pizza dough, bagels |
| Whole Wheat Flour | 13% – 14% | Dense breads, rustic loaves |
| Self-Rising Flour | 8% – 11% | Quick biscuits (contains baking powder) |
The Role Of Bleaching In Structure
Protein is not the only factor. Most boxed cake flour is chlorinated (bleached). This process does more than make the flour white. It alters the starch granules so they can absorb more liquid and fat without the structure collapsing.
This is why high-ratio cakes (recipes with lots of sugar and liquid) rely on cake flour. The bleaching process helps the cake set faster in the oven, locking in the air bubbles before they escape. Your DIY substitute of all-purpose flour and cornstarch mimics the protein count, but it cannot mimic the chlorination.
If your recipe calls for unbleached cake flour, your DIY swap is a perfect match. If the recipe relies heavily on the unique chemistry of bleached flour, your homemade version will still taste good, but it might not rise quite as high.
Can I Use All Purpose Flour Instead Of Cake Flour In Cookies?
Cookies are forgiving. In fact, many bakers prefer the chewiness that comes from higher protein levels. If you are baking chocolate chip cookies and the recipe calls for cake flour, it is likely trying to create a “melt-in-your-mouth” texture.
Using straight all-purpose flour in cookies will result in a crisper edge and a chewier center. This is often desirable. You generally do not need to use the cornstarch method for cookies unless you want them to be extremely tender and crumbly, like shortbread.
If you proceed with the cornstarch swap for cookies, handle the dough gently. Without the strong gluten network, the cookies may be more fragile when you transfer them from the baking sheet to the cooling rack.
Volume Vs. Weight Adjustments
Precision is the difference between a dry cake and a moist one. A cup of cake flour weighs roughly 120 grams, usually a bit lighter than a cup of all-purpose flour, which can weigh closer to 125 or 130 grams depending on how you scoop.
When you substitute, weighing your ingredients is the safest bet. If you do not have a scale, use the “spoon and level” method. Spoon the flour into your measuring cup and level it off with a knife. Do not scoop directly from the bag, as this packs the flour down and leads to accidental over-measuring.
According to the King Arthur Baking guide on measuring, a packed cup can contain up to 50% more flour than a properly aerated one. This excess flour is the main culprit behind dry, hard cakes, regardless of which type of flour you use.
Common Baking Scenarios And Outcomes
Not every baked good reacts the same way to a flour swap. Some recipes rely on structural integrity, while others need pure tenderness. Knowing the likely outcome helps you decide if you should run to the store or stick with the pantry fix.
| Recipe Type | Result With Plain AP Flour | Result With DIY Substitute |
|---|---|---|
| Vanilla Sponge | Tough, rubbery texture | Tender, soft crumb |
| Banana Bread | Chewy, hearty (Good) | Very soft, crumbly |
| Chocolate Chip Cookies | Crispy edges, chewy center | Cakey, soft, fragile |
| Pound Cake | Dense, heavy | Velvety, close crumb |
| Pie Crust | Flaky but slightly tough | Very tender, hard to roll |
When To Avoid The Swap
There are specific instances where you should stick to the recipe exactly. Angel Food Cake is the primary example. This cake relies entirely on egg whites for lift and cake flour for structure. The lack of fat in the batter makes the flour choice critical.
If you use plain all-purpose flour in an Angel Food Cake, the weight of the protein often collapses the delicate egg white foam. The cake may turn out dense and rubbery rather than light as air. While the cornstarch hack is better than nothing, real bleached cake flour creates the specific acidity and starch structure required for this specific dessert.
Troubleshooting Your Batter
If you have mixed your batter using the substitute and things look wrong, pause before baking. The absorption rates of flours differ. All-purpose flour absorbs more liquid than cake flour.
If your batter looks too thick or dry, add liquid (milk or water) one tablespoon at a time until it reaches the correct consistency. Conversely, if you used too much cornstarch, your batter might seem loose. Do not add more raw flour at this stage, as it can create lumps. Trust the baking process to set the structure.
Sifting Frequency
The importance of sifting cannot be overstated. Cornstarch creates a fine powder that clumps easily in humidity. If you dump the cornstarch on top of the flour and mix it with a spoon, you will get pockets of starch in the final product. These pockets turn into gel-like blobs when baked.
Sift the flour and cornstarch mixture onto a piece of parchment paper, then funnel it back into the sifter and do it again. This mechanical action disperses the starch granules between the flour proteins, preventing them from linking up too strongly. This is how you “fake” the milling process of soft wheat.
Understanding Gluten Development
Baking is chemistry. When water meets wheat flour, two proteins (glutenin and gliadin) bond to form gluten. Mixing strengthens these bonds. In bread, you knead the dough to maximize this network, creating a structure that traps yeast gas.
In cakes, you want to limit this network. You want just enough structure to hold the cake up, but not enough to make it tough. This is why recipes tell you to “mix until just combined.” Over-mixing batter made with all-purpose flour is disastrous because the higher protein content allows strong gluten strands to form quickly.
By cutting the flour with cornstarch, you literally put physical barriers between the protein strands. The starch gets in the way, stopping the gluten from linking up. This is why the cornstarch trick works so effectively for tenderizing baked goods.
The Impact On Flavor
Many bakers worry that adding cornstarch will leave a chalky taste. In the small quantities used for this substitute (two tablespoons per cup), the flavor is undetectable. The other ingredients—butter, sugar, vanilla, eggs—easily mask the neutral taste of the starch.
However, quality matters. Ensure your cornstarch is fresh and has been stored in an airtight container. Old cornstarch can absorb odors from the cupboard, which will transfer to your cake. Check the USDA shelf life guidance to ensure your thickeners are still good to use.
Final Adjustments For High Altitude
If you bake at high altitude, the rules shift again. Lower air pressure means cakes rise faster and dry out quicker. The structural weakness of cake flour (or your DIY sub) can sometimes lead to collapse at high elevations.
In these environments, using straight all-purpose flour without the cornstarch might actually be beneficial. The extra protein provides the necessary scaffolding to hold the cake up against the rapid expansion of gas. If you live above 3,500 feet and are wondering, “can i use all purpose flour instead of cake flour?” the answer is increasingly yes, and you might skip the cornstarch entirely to ensure your cake does not fall in the middle.
