Flour strength
About flour protein
Don't have bread flour? No problem. Here's how to think about boosting protein with vital wheat gluten — and what the calculator does for you.
The protein problem
Protein (specifically glutenin and gliadin) is what forms gluten structure in dough. All-purpose (AP) flour is often in the 9–12% range on labels (many US bags land near 10–12%). Bread flour is commonly about 12–14% protein.
That gap changes chew, rise, and how much water the dough wants. By adding vital wheat gluten (VWG) — mostly protein, often around 75% on the label — you can lift AP toward bread- or high-gluten strength without buying a second bag of flour.
The math
The calculator uses a mixing rule so the weighted average of your base flour and VWG hits your target protein. That's the same idea as a Pearson square: two known endpoints, one target in between.
This only works when your target sits between base flour protein and VWG protein — for example, blending ~11% AP with ~75% VWG to land near 14%.
Typical protein ranges
Labels vary by brand and region. Treat these as ballparks, not exact matches to every bag.
| Type of wheat flour | Protein content |
|---|---|
| Cake | 7–8% |
| Pastry | 8–9% |
| Self-rising | 8.5% |
| Instant | 9.5–11% |
| All-purpose | 9–12% |
| 00 (Doppio Zero) | 11.5–13% |
| Whole wheat | 11–15% |
| Bread | 12–14% |
| Durum | 13% |