What Can I Substitute for Cake Flour? | Easy Pantry Fix

The best substitute for cake flour is all-purpose flour combined with cornstarch, using a ratio of 2 tablespoons cornstarch per cup minus 2 tablespoons of all-purpose flour, sifted together for a fine, tender crumb.

Running out of cake flour right before baking feels like a hard stop, but the fix is a pantry staple trick. Cake flour’s low protein content (about 7-8%) produces tender cakes by limiting gluten development. All-purpose flour sits higher at 10-12%, so the cornstarch step dilutes that protein and mimics the texture you need. The method takes about two minutes and works for any recipe that calls for cake flour.

The Best Substitute: AP Flour + Cornstarch

This combination comes closest to matching cake flour’s protein level and fine texture. For every 1 cup of cake flour your recipe requires, measure 1 cup of all-purpose flour into a bowl, remove 2 tablespoons of the flour, then add 2 tablespoons of cornstarch. Whisk the mixture together, then sift through a fine-mesh sieve at least 2-3 times. The sifting aerates the blend and distributes the cornstarch evenly — skipping it creates dense patches in your batter.

If you prefer measuring by weight, the ratio is 85 grams sifted all-purpose flour plus 15 grams cornstarch to equal 100 grams sifted cake flour. This is more precise than volume measurements and reduces variation from scooping methods.

Other Viable Cake Flour Substitutes

Not everyone keeps cornstarch on hand, or you may need a gluten-free option. These alternatives work well for specific baking needs, but each comes with a small adjustment.

Pastry flour

Pastry flour sits at roughly 8-9% protein, very close to cake flour. Use a straight 1:1 swap — measure 1 cup pastry flour for every 1 cup cake flour. No sifting or blending required. This is the simplest substitute if you already stock it.

Self-rising flour

Self-rising flour contains added baking powder and salt. Swap it 1:1 for cake flour, but omit any baking powder and salt your recipe already calls for. Over-leavening causes a lopsided rise and a soapy aftertaste, so check the recipe first.

Almond flour (gluten-free)

Almond flour adds moisture and a nutty flavor, but it’s denser than cake flour. Use ¾ cup almond flour per 1 cup cake flour, and reduce the total flour in the recipe by ¼ cup. You may also need an extra egg for structure.

Oat flour + arrowroot (gluten-free)

Blend 1 cup oat flour with 1 tablespoon arrowroot or cornstarch. This creates a light, gluten-free substitute. Arrowroot improves the crumb, but the batter may need a slightly longer rest before baking.

Cassava flour (gluten-free)

Cassava flour works as a 1:1 swap, but it absorbs liquid faster than cake flour. Add 1-2 tablespoons of extra water or milk if the batter looks dry. It yields a tender crumb with a neutral flavor.

Coconut flour (gluten-free)

Coconut flour is extremely absorbent. Use only ¾ cup per 1 cup cake flour, and add one extra egg plus a tablespoon or two of liquid per ¼ cup used. The result is more delicate and best for moist cake recipes.

The table below summarizes the key ratios and adjustments for each substitute.

Common Mistakes to Avoid

The most frequent error is skipping the sifting step with the AP flour and cornstarch blend. Starch settles quickly during mixing, and unsifted pockets produce a heavy, dense cake. Weighing ingredients instead of scooping from the bag also improves consistency — a packed cup of flour can add 20% more protein than intended.

For gluten-free substitutes, always check the batter consistency before pouring. Cassava and coconut flour absorb liquid at different rates, and a dry batter overbakes quickly. The same principle applies to bread flour swaps: avoid them unless you want a sturdier, less tender result.