Baking
Bread Flour Conversion
Bread Flour weighs 127g per US cup.
| Amount | Grams | Ounces |
|---|---|---|
| 1 cup | 127.0 g | 4.48 oz |
| 1/2 cup | 63.5 g | 2.24 oz |
| 1/4 cup | 31.8 g | 1.12 oz |
| 1 tbsp | 7.9 g | 0.28 oz |
| 1 tsp | 2.6 g | 0.09 oz |
| 100 g | 100.0 g | 3.53 oz |
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Bread flour weighs 127 grams per spooned-and-leveled cup, a touch heavier than all-purpose flour's 120g, because it's milled from harder wheat with a higher protein content (typically 12-14%, versus all-purpose's roughly 10-12%) — that extra protein is what forms more and stronger gluten strands once the flour is kneaded with water.
That gluten strength is the entire point of bread flour: it's what lets a yeasted dough stretch thin enough to trap the gas bubbles produced during fermentation without tearing, giving bread its characteristic chew and open, airy crumb — a structural job all-purpose flour can do adequately but not as well.
Swapping bread flour into a recipe written for all-purpose flour (or the reverse) works by weight or volume without much drama in a rustic loaf, but the difference becomes obvious in anything meant to be tender rather than chewy — a cake or biscuit made with bread flour comes out noticeably tougher, since the extra gluten development that's desirable in bread actively fights tenderness elsewhere.
Bread flour's higher protein content (typically 12-14%, versus all-purpose's 10-12%) is what actually accounts for its slightly heavier 127g-per-cup figure — more protein means more of the gluten-forming structure that gives bread its characteristic chew, and that denser protein network packs marginally more mass into the same measuring cup than all-purpose flour's lighter blend does.
Because bread flour absorbs water slightly differently than all-purpose, a straight swap in a bread recipe can leave dough a touch stiffer or slacker than intended — professional bakers account for this with small hydration adjustments rather than treating the two flours as fully interchangeable pound-for-pound.
It's also the standard choice for pizza dough and bagels, where a strong, chewy structure is a defining feature rather than an incidental one.
Some brands market a slightly higher-protein "high-gluten" flour still further up the spectrum, aimed at bagels and specialty breads.
Some home bakers keep both bread and all-purpose flour on hand specifically to match whichever a given recipe was actually developed with.
Frequently asked questions
Why does bread flour weigh slightly more per cup than all-purpose flour?
Because it's milled from a harder wheat variety with more protein by percentage, and that extra protein forms a denser gluten network — enough denser that a spooned-and-leveled cup of bread flour outweighs the same cup of all-purpose.
Can I use bread flour for cookies or cake?
You can, but expect a chewier, denser result than the recipe intended — bread flour's higher protein builds more gluten during mixing, which works against the light, tender texture most cookie and cake recipes are aiming for.
Does bread flour need to be measured differently than all-purpose flour?
No — the same spoon-into-the-cup-and-level convention applies; only the resulting weight (127g vs. 120g for the same cup) differs, reflecting the flour's own density, not a different measuring technique.
Is bread flour the same as "strong flour" in UK recipes?
Yes, essentially — UK "strong flour" or "strong white bread flour" refers to the same higher-protein wheat flour category as US bread flour, milled for the same gluten-development purpose.
Does bread flour make a meaningful difference in a bread machine recipe?
Often yes — bread machine recipes are frequently developed and tested specifically with bread flour's higher protein in mind, since the machine's single, shorter knead cycle benefits from a flour that develops gluten readily.