Cake flour is a finely milled, low-protein wheat flour with a protein content of around 7–9%, significantly lower than all-purpose flour's 10–12%. That reduced protein level means less gluten develops during mixing, which translates directly into a more tender, delicate crumb — the hallmark of a well-made layer cake, chiffon, or sponge. Cake flour is also bleached, which slightly acidifies the flour and helps it bond better with fat and sugar, contributing to a finer, more velvety texture.
You might need a cake flour substitute if your pantry only stocks all-purpose flour, or if you're looking for a gluten-free option for a delicate cake. The good news is that the classic all-purpose flour and cornstarch hack is reliable and widely used even in professional kitchens when cake flour runs out.
The essential goal when substituting cake flour is to reduce the protein content of whatever flour you use. Diluting all-purpose flour with a starch — which contains no protein — effectively lowers the overall protein percentage and produces a more tender result. The finer grind of cake flour also contributes to texture, so sifting your substitute is always a good idea.
■Best Substitutes for Cake Flour
These substitutes work best in layer cakes, cupcakes, chiffon cakes, and other recipes where a tender crumb is the goal.
| Substitute | Flavor / Texture Match | Swap Ratio |
|---|---|---|
| All-Purpose Flour + Cornstarch | Excellent — nearly identical crumb | 3/4 cup AP + 2 tbsp cornstarch per 1 cup cake flour |
| Pastry Flour | Very close — slightly more protein than cake flour | 1:1 |
| All-Purpose Flour (plain) | Slightly denser, less tender | 1:1; sift well and don't overmix |
| Rice Flour (white, finely milled) | Lighter texture, mild flavor — gluten-free | 7/8 cup per 1 cup cake flour |
| All-Purpose Flour + Arrowroot Powder | Good — similar to cornstarch method | 3/4 cup AP + 2 tbsp arrowroot per 1 cup cake flour |
| Spelt Flour (white) | Mild, slightly nutty — whole grain | 1:1; slightly denser crumb |
■How to Choose the Right Substitute
The gold-standard substitute for cake flour is all-purpose flour combined with cornstarch. For every cup of cake flour called for in a recipe, measure out 3/4 cup of all-purpose flour, then add 2 tablespoons of cornstarch to make up the difference. Whisk or sift them together thoroughly to ensure even distribution, then sift the combined mixture at least once before using it. This method works reliably in nearly every recipe that calls for cake flour.
Pastry flour is the next best option if you can find it. It sits between cake flour and all-purpose flour in protein content (around 8–9%), producing a tender crumb without being quite as delicate as cake flour. It's particularly well-suited to pie crusts, biscuits, muffins, and cookies in addition to cakes. If you're baking a recipe that uses both fat and sugar to tenderize the crumb (like most layer cakes), pastry flour will perform very close to cake flour with no other adjustments needed.
For gluten-free baking, finely milled white rice flour is the most neutral-tasting option and produces a light texture in cakes. It works best in recipes that already use eggs and fat for structure, since rice flour produces no gluten. Blending rice flour with a small amount of tapioca starch can help improve the texture and reduce any grittiness. Avoid using almond flour or coconut flour as a direct substitute in delicate cake recipes — their high fat content and absorbency dramatically change the outcome.
■Frequently Asked Questions
Why does the all-purpose flour and cornstarch method work? Cornstarch is a pure starch with no protein. By replacing a portion of all-purpose flour (which contains protein) with cornstarch, you reduce the total protein percentage of the mixture, which in turn limits gluten development during mixing. Less gluten means a more tender, softer crumb — exactly what cake flour provides. Sifting the two together ensures they're evenly combined so you don't get pockets of starch in the batter.
Can I use self-rising flour instead of cake flour? Self-rising flour contains all-purpose flour, baking powder, and salt pre-mixed in. If a cake recipe already calls for baking powder and salt, using self-rising flour will result in too much leavening and too much salt. You'd need to omit the baking powder and salt from the recipe to compensate. Self-rising flour also has higher protein than cake flour, so the texture will be less delicate. It's a possible swap in a pinch but not ideal.
Does using cake flour flour make a big difference in recipes? In delicate recipes — chiffon cakes, angel food cakes, and fine layer cakes — the difference is noticeable. Cake flour produces a noticeably finer, softer crumb. In heartier bakes like banana bread, muffins, or pound cake, the difference is minimal and using all-purpose flour is perfectly acceptable.
Can I substitute cake flour in bread recipes? Cake flour is not suitable for yeasted breads. The low protein content means insufficient gluten develops to trap gas and give bread structure. Bread made with cake flour will be dense and crumbly. Use bread flour or all-purpose flour for yeasted bread recipes.
Is cake flour the same as plain flour in the UK? No. UK "plain flour" is roughly equivalent to US all-purpose flour in protein content. UK "sponge flour" or "super-fine flour" is more comparable to US cake flour. If following a US recipe that calls for cake flour, use the all-purpose flour plus cornstarch method if you only have plain flour available.
See also: Food Substitutes Guide | All-Purpose Flour Substitutes | Cornstarch Substitutes