Bread Flour Protein Content Chart: Verified Mill Specifications (2026)

Two bags can both say “bread flour” and behave differently. Protein helps explain the difference, but the wheat, milling, bran, starch damage and other ingredients in the bag matter too.

The chart below uses manufacturer-published figures checked September 25, 2026. It compares 13 specific products, not 30 brands, and is a desk-researched reference rather than a baking-test ranking. Published specifications can change; the exact product and current bag take priority over an old chart.

Flour Protein Content Chart

These are the manufacturers’ stated figures or ranges, not laboratory measurements made by JayArr. Where the linked consumer page does not state a moisture basis, this table does not infer one. That limits very fine comparisons across mills.

The product names matter. Full Strength is a General Mills/Gold Medal flour at 12.6% in the cited specification, not a ConAgra high-gluten flour at 13.8%. Caputo makes multiple flours; “Caputo 00” alone does not identify one protein figure. A professional whole-wheat product and a retail whole-wheat bag from the same company may also have different specifications.

If your flour is missing, look for its current technical sheet or contact the mill. An unverified number copied across flour charts is less useful than an honest gap. For a broader buying comparison, see our bread flour brands guide.

What Protein Tells You — and What It Cannot

In wheat dough, glutenin and gliadin contribute to the gluten network that develops with hydration and mixing. Glutenin is especially important to elastic strength; gliadin contributes to flow and extensibility. Total protein gives a useful clue to gluten-forming potential, but neither the number nor those simplified roles describe the entire dough.

Flour performance also depends on protein quality and the balance between resistance and stretch. Two flours with similar protein can produce doughs that handle differently. A high percentage is not an automatic guarantee of an open crumb, strong gas retention or a better loaf.

Do not confuse flour protein with the protein content of the finished bread. Eggs, seeds, dairy and other additions can raise a loaf’s nutritional protein without acting like wheat gluten. Our high-protein bread guide covers that distinction.

More protein does not give you an exact water adjustment

Higher protein can increase water absorption, but so can damaged starch and flour components such as pentosans. KPM’s flour-analysis guidance treats protein quantity, protein quality and other flour properties as separate contributors to dough consistency.

When changing bags, start with the recipe’s intended dough consistency. If you are uncertain about the replacement, reserve a little of the water and add it gradually if needed. Let the flour hydrate before deciding the dough is too stiff; keep a record of the actual amount used. There is no universal “one extra protein point means this much extra water” conversion.

Nor must every substitution force a change. King Arthur’s bread-flour substitution trials illustrate that both flours can produce successful bread; differences depend on the formula. Preserve the recipe’s intended texture rather than applying one dry-or-sticky rule to every style.

Why Whole Wheat Needs Its Own Comparison

Whole wheat includes bran and germ as well as endosperm. Its total protein percentage does not tell you how much functional gluten it will develop compared with white flour. Bran changes water distribution and dough structure; particle size, composition, flour blend and processing all matter.

It is too simple to say that bran merely acts like blades cutting gluten. Research on bran particle size and processing shows that its effects depend on how the bran is prepared and incorporated. A fixed comparison such as “14% whole wheat is weaker than 12.7% white flour” cannot be generalized to every pair of products.

Use a formula developed for the proportion of whole grain you intend to bake. It may call for more water, a rest or a different mixing schedule; a longer autolyse and gentler mixing are not mandatory for every whole-wheat dough. See our whole wheat bread guide for the broader technique.

Wheat Classes, Durum and Bread

U.S. Wheat Associates identifies six principal commercial classes: Hard Red Winter, Hard Red Spring, Hard White, Soft White, Soft Red Winter and Durum. Hard White is not exclusively a winter class, and splitting Soft White into spring and winter while omitting Soft Red Winter gives the wrong list.

Hard wheats commonly supply bread flours. Soft wheats are often used in cakes, crackers and pastries, and can also be used in blends for certain breads. Class is a broad description, not a fixed protein percentage for every crop or finished flour.

Durum can make bread. It is familiar in pasta, but also has established bread uses. King Arthur’s Jeffrey’s Golden Durum Sesame Bread, for example, is built around durum flour with all-purpose flour. Its method does not make every coarse semolina a direct replacement for white bread flour; milling and recipe design still matter. Use a durum or semolina bread formula instead of excluding the grain because its gluten behaves differently.

Flour Type Numbers Are Not Protein Percentages

French T numbers and German type numbers describe ash-related flour categories, rather than how much protein a bag contains. Italian 00 is also a regulated flour category, not a promise of low protein or a universal particle size. The Italian standard sets out ash and protein requirements, rather than one exact protein percentage; different 00 products can therefore behave differently. See DPR 187/2001, Article 1 and Hesse’s explanation of German flour types.

Ash is the mineral residue measured after a controlled burn. It is related to which parts of the grain remain in the flour, but it is not itself a measurement of gluten strength. Country-specific type numbers are not interchangeable with one another or with a US brand’s product name.

There is also no universal American-to-French water conversion. A recipe written for one T55 flour cannot reliably be converted by adding a fixed three or five percentage points of hydration. Compare the specific flours and adjust the process from the dough you actually have.

Reading a Nutrition Label

On a US Nutrition Facts panel, protein is normally given in grams per serving. Any protein % Daily Value is a different number: it is not the flour’s protein percentage by weight.

For a rough mass percentage, divide protein grams by serving grams and multiply by 100. A label declaring 4 g in a 30 g serving gives:

4 ÷ 30 × 100 = about 13.3%.

That is only a rough estimate because US labeling rules round protein to whole grams. For example, 12.7% of 30 g is 3.81 g, which also rounds to 4 g. The panel cannot distinguish those figures precisely. For baking comparisons, prefer the mill’s specification and check whether technical sheets use the same moisture basis.

Damaged Starch Is Another Variable

Milling physically damages some starch granules. That starch takes up more water and is more accessible to enzymes than intact granules. A suitable amount can support baking performance; too much, in combination with the rest of the flour and process, can contribute to sticky dough or low loaf volume. KPM’s damaged-starch overview explains why mills measure it alongside protein.

This is not a simple story in which damaged starch always absorbs water and then dumps it during baking, making a loaf collapse. Nor can a sticky dough diagnose starch damage on its own. Fermentation, hydration and handling can produce similar symptoms. Without comparable testing, a single US-versus-European average is not a useful rule for choosing flour.

Choosing a Flour for the Bread You Want

A broad protein chart narrows the choices; a recipe and a small bake tell you whether a particular flour suits your goal. When replacing a flour, change one variable at a time and record what you observe. Our bread flour substitutes guide has more detail on practical swaps.