Understanding different flours: which one to use and why

The key factor: protein content

What separates most wheat flours is protein content. Protein determines how much gluten forms when the flour is mixed with water. More gluten means more structure and chew — ideal for bread. Less gluten means a more tender, delicate crumb — ideal for cakes and pastries.

All-purpose flour (120 g per cup)

All-purpose flour is the middle ground — enough protein for structure, not so much that baked goods become tough. It works in cookies, muffins, quick breads, pancakes, and most cakes. It is the safe default when a recipe just says "flour."

Bread flour (120 g per cup)

Bread flour has higher protein content (12–14% vs. 10–12% for all-purpose). The extra protein builds a stronger gluten network, which traps more gas from the yeast, producing a better rise and a chewier crumb. Use it for yeast breads, pizza dough, and bagels. It weighs the same per cup as all-purpose, but the higher protein content changes the result.

Cake flour (site reference: 100 g per cup, sifted)

Cake flour is intended for tender cakes. This site uses 100 g per US cup for sifted, lightly filled cake flour. That unverified working reference does not apply to every brand or to unsifted flour; use the recipe’s specified product, preparation and gram weight when available.

Whole wheat flour (120 g per cup)

Whole-wheat flour contains bran and germ as well as endosperm. It can change water absorption and dough texture. Our 120 g-per-cup reference does not make it equivalent to all-purpose flour in a recipe.

Specialty and alternative flours

Rye and spelt flours vary with extraction and milling; both contain gluten. Buckwheat is naturally gluten-free. For a gluten-free recipe, check product labelling and use a formula designed for those ingredients.

Oat flour (92 g/cup) is light and slightly sweet — good in pancakes and muffins. Rice flour (160 g/cup) is denser and commonly used in gluten-free baking as a base.

Why flour type matters for measurement

Cup-to-gram conversion controls quantity, not baking behaviour. When changing flour, use a tested substitution that accounts for structure and liquid needs.