What's the difference between Whole Wheat Flour and White Whole Wheat Flour?

Whole Wheat Flour: 13.00-14.00% protein, absorption 1.075×, hydration 75-85%. White Whole Wheat Flour: 12.50-13.50% protein, absorption 1.060×, hydration 72-82%.

Can I substitute Whole Wheat Flour for White Whole Wheat Flour 1:1?

Yes — absorption is close enough that a 1:1 swap works with minor tweaks.

Which is better for open-crumb sourdough?

Whole Wheat Flour supports higher hydration (up to 85%), making it better suited to open-crumb hearth loaves than White Whole Wheat Flour (max 82%).

Side-by-side comparison

Whole Wheat Flour vs White Whole Wheat Flour

	Whole Wheat Flour	White Whole Wheat Flour
Protein	13.00–14.00%	12.50–13.50%
Absorption (× bread flour)	1.075	1.060
Hydration range	75–85%	72–82%
Category	whole-wheat	whole-wheat
Ash %	1.60	1.55

Whole Wheat Flour

Whole wheat flour contains the entire wheat kernel — bran, germ, and endosperm. Bran absorbs ~7.5% more water than refined flour, and the sharp bran particles cut through gluten strands, reducing effective gluten structure. Protein is higher by weight (13-14%) but functional gluten is lower. Result: whole wheat needs higher hydration (typically 80%+) and produces a denser, more flavorful crumb. WSU Bread Lab research shows hard red winter wheat varieties (Yecora Rojo, Warthog) mill into premium whole wheat for sourdough. King Arthur's Traditional Whole Wheat is a reliable reference.

White Whole Wheat Flour

White whole wheat is milled from hard white wheat (not red). Same whole-kernel nutrition as red whole wheat but with a milder, sweeter flavor profile and slightly lighter crumb color. Protein is ~0.5% lower than red whole wheat, and absorption is ~1.5% less. Good gateway for bakers transitioning from refined flours. King Arthur's White Whole Wheat is the US reference. Excellent in 20-40% blends with bread flour for everyday sourdough that's more nutritious than 100% refined but less intense than 100% red whole wheat.

Substitution math

When substituting Whole Wheat Flour for White Whole Wheat Flour in a recipe, absorption is close enough that a direct swap works. Expect minor texture differences but similar handling.