What Is a Substitute for Cake Flour?

What's the best cake flour substitute?

Per cup of cake flour: measure 1 cup of all-purpose flour, remove 2 tablespoons, and add 2 tablespoons of cornstarch in their place. Sift the mixture 3-4 times to distribute the cornstarch evenly through the flour.

The math: all-purpose flour is about 10-12 percent protein, while cake flour is about 7-9 percent protein. The cornstarch dilution drops the protein content of the AP flour mix to approximately match cake flour. The result is close enough that most recipes work well.

Why does cake flour matter for tender cakes?

Lower protein flour produces less gluten when mixed with liquid. Less gluten means a softer, more tender crumb. This is critical for delicate cakes (angel food, chiffon, classic layer cakes) where you want a fine, soft texture. All-purpose flour without the cornstarch dilution makes cakes denser and chewier because the higher protein content develops more gluten. The substitute brings the protein content down to cake-flour levels, which preserves the tender texture.

Can you use pastry flour instead?

Yes. Pastry flour has a protein content between cake flour (7-9 percent) and all-purpose flour (10-12 percent), usually around 8-10 percent. It works as a 1-to-1 substitute for cake flour in most recipes, though the result will be slightly less tender than with true cake flour. Self-rising flour also contains cake flour as a base, though it adds baking powder and salt. If a recipe uses self-rising flour and needs the leavening, it's already partly substituting for cake flour. For recipes that need cake flour without the leavening, the DIY mix (AP flour plus cornstarch) is the better choice.

When does the cake flour substitute fail?

For ultra-delicate cakes (angel food, chiffon, sponge cake), the DIY substitute gets close but doesn't quite match commercial cake flour. The structure may be slightly less fine. For competition baking or recipes where texture is paramount, real cake flour is worth seeking out. For everyday baking (basic layer cakes, cupcakes, muffins), the substitute works well. The flavor and texture differences are minimal for most home bakers, and the swap saves a trip to the store.