Baking Guide · Beginner

Bread Flour vs All Purpose Flour — What's the Difference?

Bread flour vs all purpose flour — protein content, gluten strength, when to use each, and how to substitute one for the other in bread, sourdough, and baking.

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Two bowls of white flour with dough samples showing different texture

Updated September 2026 · 8 min read

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Bread flour and all purpose flour come from the same wheat plant. The difference is protein content — bread flour has more, which means stronger gluten, which means chewier bread. That one number, protein percentage, drives every practical difference between the two.

The protein difference

12–14% Bread flour
10–12% All purpose
7–9% Cake flour
13–14% Whole wheat

Protein content determines how much gluten the flour can form. More gluten means a stronger, more elastic dough that traps gas well and gives bread its chew and structure. Less gluten means a softer, more tender crumb — which is what you want in a cake or pastry.

When to use each

Use bread flour for Sourdough, sandwich loaves, bagels, pizza dough, dinner rolls, brioche, and any bread where chew and structure matter. The extra protein gives better oven spring, a more open crumb, and a chewier bite.
Use all purpose for Cakes, cookies, muffins, scones, pancakes, pie crust, quick breads, and general baking. It is called "all purpose" because it works acceptably everywhere. For sourdough, it makes a slightly softer, tighter loaf — still good, just different.
Either works for Most home bread recipes, sourdough included. The difference matters most at the extremes — bagels need bread flour for chew; tender cake needs AP or cake flour for softness. For a standard loaf, either works and the difference is subtle.
Bread flour on a kitchen scale beside a jug of water and a bowl of freshly mixed dough

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How to substitute

AP → bread flour swap 1:1 by weight. Add 5–10% more water — bread flour absorbs more. Expect a chewier result.
Bread flour → AP swap 1:1 by weight. Reduce water by 5–10% or the dough will be slacker. Expect a softer, less chewy result.
DIY bread flour add 10g vital wheat gluten per 120g AP flour. This raises the protein to bread flour level and is a reliable substitute.

For sourdough specifically

Most sourdough recipes default to bread flour, and for good reason: the stronger gluten gives better oven spring, a more open crumb, and a loaf that holds its shape. But all purpose flour makes perfectly good sourdough — it just behaves differently.

Bread flour sourdough stronger, more elastic dough. Holds shape better during long bulk ferments. Better oven spring and a more open crumb. The default choice for most sourdough bakers.
AP flour sourdough slightly weaker dough that spreads more. Tighter crumb, less oven spring, but a softer, more tender bite. Many experienced bakers prefer AP for sandwich loaves and enriched doughs.
Blend a 50/50 mix of bread flour and AP gives a middle ground — enough strength for structure, enough softness for tenderness. A good place to start if you are unsure.

Protein content by brand

Not all “all purpose” flour is created equal. Protein content varies by brand, region, and wheat variety.

Watch for

  • Southern US brands (White Lily, Martha White) can be as low as 8–9% protein — closer to pastry flour than true AP.
  • Northern US brands (King Arthur, Gold Medal) run 10.5–11.7% protein — significantly stronger.
  • If your "all purpose" loaves are flat and dense, check the protein content — you may need to switch brands or use bread flour.

To check any flour: look at the nutrition label, divide protein grams by the serving size in grams, and multiply by 100. That gives you the protein percentage.

FAQ

Frequently asked questions

Can I use all purpose flour instead of bread flour?
Yes, in most recipes you can swap them 1:1 by weight. The result will be slightly softer and less chewy with all purpose flour because it has less protein and forms a weaker gluten network. For everyday bread and sourdough, the difference is noticeable but not a dealbreaker. For bagels, where chew is the whole point, bread flour is worth using.
Can I use bread flour instead of all purpose flour?
Yes, but the result will be slightly chewier and tougher. For cakes, muffins, and tender pastries, all purpose is better — the extra gluten from bread flour can make them dense and rubbery. For cookies, bread flour gives a chewier texture, which some people prefer.
Does bread flour need more water than all purpose?
Yes. The extra protein in bread flour absorbs more water, so doughs made with bread flour may feel stiffer if you use the same amount of water as an AP recipe. Add 5–10% more water when substituting bread flour into an AP recipe, or reduce water slightly when going the other direction.
Which flour is better for sourdough bread?
Bread flour is the default choice for sourdough because the higher protein gives the strong gluten network that holds gas and creates an open crumb with good oven spring. All purpose works fine — many great sourdough bakers use it — but the loaf will have a tighter crumb and less chew.
What is the protein content of bread flour vs all purpose?
Bread flour is typically 12–14% protein. All purpose flour is 10–12%, though it varies by brand and region — Southern US AP flour can be as low as 8–9%, while Northern brands tend to be closer to 11–12%. Check the nutrition label: divide protein grams by serving size grams and multiply by 100.
Is bread flour the same as strong flour?
Yes. In the UK and Australia, 'strong flour' or 'strong bread flour' is the same product as American bread flour — high-protein wheat flour milled for bread baking. In Canada, the equivalent is 'bread flour' or 'hard wheat flour'. The protein content is the same (12–14%).
Can I make my own bread flour from all purpose?
You can increase the protein by adding vital wheat gluten — about 1 tablespoon (10g) per cup (120g) of all purpose flour raises the protein to roughly bread flour level. Mix it into the dry flour before adding liquid. This is a reliable workaround if bread flour is unavailable.
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