Types of Flour for Baking: Which Flour Does What?

It is all about protein (and gluten)

Flour's protein is what becomes gluten when flour meets water and mixing. Gluten is the elastic network that traps gas in a rising loaf and gives bread its chew — and the same network is a fault in a sponge cake, where you want tenderness, not elasticity. Millers control protein first by choosing the wheat: hard wheats are naturally higher in protein, soft wheats lower. They control it again by milling: whole wheat flour keeps the bran and germ, which add nutrition and flavour but physically cut through gluten strands, which is why wholemeal loaves rise less even though the flour's protein percentage is high.

The practical upshot for home bakers: choose flour by the texture you want, not by habit. High protein for anything that should be chewy, structured or stretched thin. Low protein for anything that should melt, crumble or stay delicate. All-purpose sits deliberately in the middle, good at almost everything and perfect for very little — which is exactly why it is the world's default.

The main types of flour for baking, compared

A note on names across the Atlantic: American all-purpose flour is British plain flour; bread flour is strong flour; cake flour has no exact British equivalent (soft plain flour is closest). Grams per cup above are the same chef-reviewed values our Cups to Grams converter uses, and the full list of flours is in our grams in a cup chart.

Best uses for each type of flour

Bread flour earns its place anywhere yeast and structure meet. Its extra protein builds a stronger gluten network, so loaves rise taller, pizza bases stretch without tearing, and the crumb chews rather than crumbles. Cake flour is finely milled from soft wheat and, in the US, usually bleached, which helps it set a tender, even crumb and absorb liquids and fats smoothly — the reason serious layer cakes specify it. Whole wheat flour brings flavour, fibre and a shorter, denser texture; its bran drinks more water than white flour, so doughs made with it feel dry at first and soften as they rest. Self-raising flour is a convenience with a clock on it: the baking powder mixed through it weakens over months in the cupboard, so an old bag can quietly under-rise a batch of scones.

Which type of flour is best for cakes?

For a delicate sponge or a fine-crumbed layer cake, cake flour — the lowest-protein type of flour at 7–9 percent — gives the tenderest result. For everyday cakes, muffins and traybakes, all-purpose flour is the reliable default and what most recipes are written for. Bread flour is the one to avoid for cakes: its high protein builds chew where you want softness.

Substitution rules that actually work

All-purpose ↔ bread flour: swap one-for-one by weight — both are 120 g per cup — and accept a texture shift: slightly softer bread, slightly sturdier cake. Cake flour from all-purpose: per cup, remove 2 tablespoons of flour and add 2 tablespoons of cornstarch, then sift together; in grams, about 105 g all-purpose plus 14 g cornstarch. Whole wheat in a white-flour recipe: swap a quarter to a half of the flour, add roughly a tablespoon of extra liquid per cup swapped, and rest the batter 20 to 30 minutes so the bran hydrates before baking. Self-raising from all-purpose: whisk 1½ teaspoons of baking powder and ¼ teaspoon of fine salt into each cup of flour — and then leave any baking powder in the original recipe out, or reduce it accordingly.

When NOT to substitute

Some swaps fail for chemistry, not preference. Do not replace bread flour with cake or pastry flour in a yeast dough: there is not enough protein to hold the gas, and the loaf will not rise properly no matter how long you wait. Do not use self-raising flour in a recipe that also contains baking soda plus an acid such as buttermilk or lemon juice, because the leavening balance was calculated for plain flour and the result can taste soapy and rise unevenly. Do not swap whole wheat for all of the flour in a delicate sponge — the bran's weight and cutting action defeat the foam the cake depends on. And treat gluten-free flour blends as their own system: they are engineered mixtures of rice flour, starches and gums, and they do not substitute one-for-one for wheat flour without other changes to liquid and binding.

Frequently asked questions