How To Substitute Regular Flour For Cake Flour | Bake Better

Swap each cup of cake flour with 1 cup minus 2 tablespoons of all-purpose flour plus 2 tablespoons of cornstarch.

Running out of cake flour doesn’t mean dessert is off the table. You can get close with regular all-purpose flour if you change the mix the right way. The goal is to lower the protein a bit and keep the crumb soft, light, and fine.

This swap works well for layer cakes, cupcakes, sheet cakes, and many tender butter cakes. It’s less perfect for recipes built around a super-delicate crumb, but it still gets you a solid result at home. The trick is simple: remove some all-purpose flour, replace that part with cornstarch, and mix with a light hand.

What Cake Flour Does In A Batter

Cake flour is milled to stay soft and fine. It also has less protein than all-purpose flour, so it forms less gluten once liquid hits the bowl. Less gluten means a more tender cake, a softer bite, and a crumb that breaks neatly instead of pulling or chewing.

All-purpose flour sits in the middle. That’s why it works for cookies, muffins, pancakes, and bread-adjacent bakes. In cake batter, that extra protein can make the crumb firmer. You’ll still get a cake, but it may rise a touch less, feel a bit heavier, or lose some of that feather-light texture.

Why Cornstarch Fixes The Gap

Cornstarch doesn’t build gluten. When you mix it with all-purpose flour, you dilute the protein level and soften the finished crumb. That’s the whole reason this swap works. You’re not making true cake flour from the mill, but you are nudging regular flour in that direction.

If you skip the cornstarch and use straight all-purpose flour in a recipe written for cake flour, the cake can still bake up well. It just tends to land denser, with a tighter crumb and a little more chew.

How To Substitute Regular Flour For Cake Flour In Any Recipe

Use this formula for each 1 cup of cake flour the recipe calls for:

1. Measure 1 level cup of all-purpose flour.
2. Remove 2 tablespoons of that flour.
3. Add 2 tablespoons of cornstarch.
4. Whisk or sift well, so the mix is even.

That gives you a lighter flour blend that behaves much closer to cake flour. If you bake by weight, this works out to about 105 grams of all-purpose flour plus 14 grams of cornstarch for each cup of cake flour you need. If you scoop with cups, level the top with a straight edge. Packed flour throws the ratio off fast.

Three Small Moves That Lift The Result

• Sift once or twice. It blends the cornstarch better and adds air.
• Mix the batter only until the dry streaks are gone.
• Use room-temperature butter, eggs, and milk if the recipe calls for them.

Those little steps matter more than most bakers think. A good flour swap can still fall flat if the batter gets overmixed or the ingredients stay cold and lumpy.

When This Flour Swap Works Best

You’ll get the smoothest results in cakes where tenderness matters more than stretch or chew. Butter cakes, birthday cakes, snack cakes, and cupcakes all handle the change well. Recipes with oil also do nicely, since oil already leans soft and moist.

Foam cakes are a bit pickier. Angel food, chiffon, and some genoise recipes depend on a more delicate structure. The substitute can still work, but the crumb may not turn out as airy as it would with bagged cake flour.

Pound cake sits in the middle. It likes structure, so a straight cake-flour texture isn’t always the goal anyway. In that case, the swap still works, but don’t chase a super fluffy crumb. A tight, rich slice is part of the style.

Recipe type	How the swap performs	Best tweak
Layer cakes	Usually soft and even	Sift the flour blend well
Sheet cakes	Works with little fuss	Don’t overbake the edges
Cupcakes	Good rise and tender crumb	Fill cups evenly
Butter cakes	Rich, soft texture	Cream butter and sugar fully
Oil cakes	Moist and light	Whisk dry ingredients first
Pound cakes	Fine, but still dense by design	Expect a tighter slice
Chiffon cakes	Good, though less delicate	Fold gently to keep air
Angel food cakes	Least exact match	Use store-bought cake flour if possible

What The Numbers Tell You

Protein level is the whole story here. Tufts Food Lab’s flour types notes place cake flour around 7% to 8% protein, while all-purpose flour lands higher. The Wheat Foods Council flour primer also lays out how flour type changes structure in baked goods. That gap is why a straight one-for-one swap with regular flour can toughen a cake.

The cornstarch fix is widely used because it lowers that protein concentration in a simple way. King Arthur’s cake flour method uses the same basic ratio home bakers rely on all the time. So if your pantry has all-purpose flour and cornstarch, you’re set.

Volume Vs Weight

If you own a kitchen scale, use it. Weight keeps the swap steady from batch to batch. Cup measures work, but they can drift if you dip the cup into the bag or tap the flour down. Too much flour in the bowl is one of the fastest ways to lose tenderness.

If your recipe is written in cups, spoon the flour into the cup and level it. If it’s written in grams, stick with grams all the way through. Mixing systems can get messy fast.

Cake flour needed	All-purpose flour	Cornstarch
1 cup	1 cup minus 2 tablespoons	2 tablespoons
2 cups	1 3/4 cups	1/4 cup
2 1/2 cups	2 1/4 cups plus 2 tablespoons	5 tablespoons
3 cups	2 3/4 cups	6 tablespoons
4 cups	3 1/2 cups	1/2 cup

Mistakes That Can Ruin The Swap

A flour substitute can only do so much. The rest comes down to method. A few slipups show up again and again in home baking.

Using Self-Rising Flour

“Regular flour” should mean plain all-purpose flour here. Self-rising flour already has leavening and salt mixed in. If you use it with this formula, your cake can rise unevenly and taste off.

Skipping The Sift

Cornstarch clumps more than flour. If it isn’t mixed well, one bite of cake may feel soft while another bakes up heavier. A whisk works, but sifting does a cleaner job.

Overmixing The Batter

This one gets people every time. Once the flour blend meets liquid, gluten starts to build. Stir long past the point of smooth, and the batter turns tighter. Stop when the streaks disappear. A few tiny lumps are fine.

Changing More Than One Thing

If you’re already swapping flour, don’t also swap the fat, milk, eggs, and pan size in the same bake. Too many changes at once make it hard to tell what went wrong if the texture drifts.

When You Should Skip The Substitute

There are times when buying cake flour is the smarter move. Wedding-style layer cakes, tall bakery-style sponges, and recipes that lean on a paper-thin crumb do better with the real thing. The same goes for a first-time bake where you want to match the recipe as closely as you can.

If you bake cakes often, a bag of cake flour earns its shelf space. If you only make cake now and then, the all-purpose-and-cornstarch mix is a handy fix that saves a trip to the store.

A Soft Crumb Comes Down To The Little Steps

You don’t need a fancy pantry to turn out a tender cake. The right ratio, a quick sift, and a gentle mix get you close to the texture cake flour is known for. That’s enough for most home bakes, and in many recipes, no one at the table will know you made the swap.

So if cake flour is missing from the shelf, don’t bail on dessert. Adjust the flour, keep your measuring clean, and treat the batter lightly. That’s usually all it takes.