Bread Flour Protein Calculator Formula

Understand the math behind the bread flour protein calculator. Each variable explained with a worked example.

Use the Bread Flour Protein Calculator

Formulas Used

Blend Protein %

blend_protein_pct = round(total_protein_g / total_g * 1000) / 10

Total Flour Weight

total_weight = total_g

Total Protein

protein_weight = round(total_protein_g * 10) / 10

Variables

VariableDescriptionDefault
bread_flour_gBread Flour (12.7% protein)(g)300
ap_flour_gAll-Purpose Flour (10.5% protein)(g)200
total_gDerived value= bread_flour_g + ap_flour_gcalculated
total_protein_gDerived value= bread_flour_g * 0.127 + ap_flour_g * 0.105calculated

How It Works

How to Calculate Flour Blend Protein

Formula

Blend Protein % = (Bread Flour g x 0.127 + AP Flour g x 0.105) / Total Flour g x 100

Protein Levels by Flour Type

  • Cake flour: 7-8%
  • Pastry flour: 8-9%
  • All-purpose flour: 10-12%
  • Bread flour: 12-13%
  • High-gluten flour: 13-14%

    • Why Protein Matters

    Higher protein creates more gluten, which provides structure and chew. Pizza and bagels need 12-14%, while cakes need 7-9% for tenderness.

    Worked Example

    Blend 300 g bread flour with 200 g all-purpose flour.

    bread_flour_g = 300ap_flour_g = 200
    1. 01Bread flour protein: 300 x 0.127 = 38.1 g.
    2. 02AP flour protein: 200 x 0.105 = 21.0 g.
    3. 03Total protein: 38.1 + 21.0 = 59.1 g.
    4. 04Total flour: 300 + 200 = 500 g.
    5. 05Blend protein = 59.1 / 500 x 100 = 11.8%.

    Ready to run the numbers?

    Open Bread Flour Protein Calculator