Walk into any U.S. supermarket baking aisle and you'll see at least eight flour types: all-purpose, bread, cake, whole wheat, almond, gluten-free, self-rising, and pastry. They are not interchangeable. Each has a specific protein content, texture profile, and best use. Here's the practical guide.

Protein content drives everything

The single most important number for any flour is its protein content. Protein in wheat flour forms gluten when mixed with water. More protein = more gluten = more chew.

  • Cake flour: 6–8% protein. Tender, melts in your mouth.
  • Pastry flour: 8–10% protein. Tender but with structure.
  • All-purpose: 10–12% protein. Compromise; works for most.
  • Bread flour: 12–14% protein. Chewy, structural.
  • High-gluten flour: 14–16% protein. Bagels, pretzels.

Choose the right protein level and your bake comes out right. Choose the wrong one and you fight the dough.

All-purpose flour

The default U.S. flour. Made from a mix of hard and soft wheats. Works for most recipes — cookies, quick breads, biscuits, pancakes, even okay-but-not-great bread.

U.S. all-purpose flour brands vary slightly in protein:

  • King Arthur: 11.7% protein (high for AP)
  • Pillsbury: 10.5%
  • Gold Medal: 10.5%
  • White Lily: 8% (technically a soft-wheat flour, marketed as AP in the South)

Higher-protein AP makes sturdier breads; lower-protein AP makes more tender pastries. King Arthur and Bob's Red Mill are the two most-recommended brands among serious U.S. bakers.

Bread flour

Higher protein than AP — typically 12.5–14%. Used for yeasted breads where you want strong gluten development for chew and structure.

Substituting AP for bread flour: works, but the bread will be slightly less chewy. Add 1 tbsp vital wheat gluten per cup of AP to push the protein up.

Substituting bread for AP: also works in cookies and quick breads, slightly chewier results. Generally fine.

Cake flour

Low protein (6–8%), very fine texture. Bleached chemically (some brands) which weakens the gluten further. Used for ultra-tender cakes — angel food, chiffon, white layer cakes.

Substituting AP for cake flour: 1 cup cake flour ≈ 1 cup AP minus 2 tbsp + 2 tbsp cornstarch. The cornstarch dilutes the gluten and approximates the lower protein.

Substituting cake for AP: doesn't work well in cookies (too tender, fall apart) or breads (no structure). Stick to delicate cakes.

Whole wheat flour

Made from the entire wheat kernel — bran, germ, and endosperm. More fiber, more flavor, slightly higher protein, but the bran disrupts gluten formation.

Substituting whole wheat for AP:

  • Up to 50% replacement works in most recipes with no major texture loss.
  • 100% replacement gives noticeably denser, nuttier results.
  • Add 1–2 tbsp extra liquid per cup of whole wheat (the bran absorbs water).

Whole wheat pastry flour is a softer (lower-protein) version, great for tender whole-grain cookies and quick breads.

Gluten-free flour blends

Bob's Red Mill 1-to-1, King Arthur Measure for Measure, Cup4Cup, Better Batter — all are pre-mixed blends designed to substitute 1:1 for AP flour.

Most include xanthan gum (the binder that mimics gluten). If your blend doesn't, add 1/2 tsp xanthan per cup of flour.

Substituting GF blend for AP: usually works. Texture is slightly different — drier, sometimes gummier, sometimes crumbly. Best for cookies and quick breads. Yeasted breads are harder to perfect with GF.

Self-rising flour

AP flour with baking powder and salt premixed. Common in Southern U.S. baking.

1 cup self-rising = 1 cup AP + 1.5 tsp baking powder + 1/4 tsp salt.

If a recipe specifies self-rising and you don't have it, add the baking powder and salt yourself. If a recipe doesn't specify and you have only self-rising, don't add additional baking powder — it's already there.

Almond flour

Ground almonds. Not interchangeable 1:1 with wheat flours — almond flour absorbs less liquid and has zero gluten.

Recipes designed for almond flour (like macarons, almond cake, gluten-free cookies) work great. Trying to swap almond flour for AP in a regular recipe usually fails.

Other specialty flours

  • Rye: for rye bread. Limited gluten formation. Mix with bread flour for structure.
  • Spelt: ancient wheat with similar but slightly different protein. Substitutes 1:1 for AP in many recipes.
  • Oat flour: ground oats. Adds chew and slight nuttiness. Substitutes 1:1 in cookies and quick breads.
  • Coconut flour: very absorbent. Use 1/4 cup coconut flour per cup AP, plus more eggs/liquid.
  • Buckwheat flour: earthy, gluten-free. Good for pancakes (especially classic French galettes) and Russian blini.

00 flour (Italian)

Very finely ground wheat flour, similar protein to AP but milled differently. Pizza and pasta dough's classic flour. Smoother dough, more elastic.

Substituting bread flour for 00: works but slightly different texture. AP also works in a pinch.

Reading a flour label

The package lists protein content per serving. Divide protein grams by serving grams to get protein percentage.

Example: 4 g protein per 30 g serving = 13.3% protein → bread flour territory.

Storage

  • White flours (AP, bread, cake): 1+ year sealed at room temperature.
  • Whole wheat flour: 3–6 months at room temp; 1 year refrigerated. Goes rancid faster because of oils in the germ.
  • Almond, coconut, GF blends: refrigerate for longer life — 6 months.

Convert measurements

For converting flour measurements between cups and grams, our cup-to-gram converter handles every common type. Useful for following European recipes that call for grams or for scaling up your favorite cookbook recipe with weight precision.