All-Purpose Flour Hydration Guide

How All-Purpose Flour behaves at each hydration

All-purpose flour (AP) sits between cake flour and bread flour in protein content. At 10.5-11.7% protein, it produces softer sourdough with more tender crumb but less oven spring than bread flour. Absorption is ~3% lower than bread flour baseline. King Arthur's AP is the US reference (11.7% protein); Gold Medal and Pillsbury run slightly lower (10.5-11%). Use AP when you want a softer hearth loaf, a sandwich-style sourdough pan loaf, or when blending into enriched doughs like brioche. AP absorbs less water — recipes designed for bread flour need hydration reduced by ~3% when substituting AP.

Substituting All-Purpose Flour for bread flour

Absorption multiplier: 0.970×. When substituting for bread flour, subtract about 3% water. For example: a 75% bread-flour recipe becomes 73% when using 100% All-Purpose Flour.

The calculator below is pre-set to 66%. Adjust the slider to match your target. Salt and levain percentages are the flour-independent defaults (2.0% and 20%).

Technique at target hydration

Shorter autolyse (20-30 min) — longer autolyses over-soften the gluten. Fewer stretch-and-folds (2-3 sets) to avoid tearing the weaker gluten structure. Best for beginner hydration range 65-70%.

Calculator pre-set to 66%