1. What Is Hydration in Baker's Percentages?
In artisan baking, hydration represents the weight of all liquids expressed as a percentage of the total flour weight (which is always 100%). For instance, if your formula calls for 500g of flour and 375g of water, your dough is at 75% hydration (375 ÷ 500 = 0.75).
Water does far more than moisten flour: it controls enzymatic activity, gluten extensibility, fermentation velocity, and the gelatinization of starches during baking that gives sourdough its custardy, melt-in-the-mouth crumb.
2. The Hydration Spectrum: 65% vs 72% vs 80%
Choosing your hydration level requires balancing dough handleability against your desired crumb openness:
- 65% to 68% (Beginner Sweet Spot): Firm, cohesive, and remarkably easy to shape. Produces a tall, rounded boule with a consistent sandwich-friendly crumb. Minimal sticking to bannetons or hands.
- 72% to 75% (The Artisan Standard): The sweet spot used by top craft bakeries. Balances an open, honeycomb crumb with enough dough tension to support dramatic oven ears. Requires coil folds or gentle stretch-and-folds.
- 78% to 85% (Advanced Cloud Crumb): Loose, fluid, and highly extensible. Produces massive translucent alveoli and blistered crusts, but demands high-protein flours and expert shaping with a wet bench knife.
3. The Bassinage (Double Hydration) Method
If you dump 80% water into flour all at once, you risk "drowning" the gluten proteins before they form strong molecular bonds. The professional solution is bassinage (French for "basting" or double hydration):
- Mix flour with 70% of the formula's water during autolyse to develop a cohesive gluten matrix.
- Incorporate mature levain and salt.
- Slowly drizzle in the remaining 5% to 10% water in two stages during your initial stretch-and-folds, allowing the dough to drink up the liquid without turning soupy.
4. Flour Absorption: Protein & Ash Capacity
Never treat all flours identically. A standard 11.5% protein all-purpose flour will turn into liquid batter at 78% hydration, whereas a 13.5% unbleached hard red spring wheat or whole grain rye will feel surprisingly stiff at the exact same percentage.
Whole grain flours contain bran particles that absorb up to 20% more water than refined white endosperm. When adding whole wheat, spelt, or rye to your formula, increase total water by 3% to 5% to prevent a dry, tight crumb.
5. Master 75% Baker's Percentage Formula
Here is our tested, repeatable bakery formula for a 900g rustic artisan batard:
| Ingredient | Baker's % | Weight (Grams) |
|---|---|---|
| Strong Bread Flour (12.7%+) | 85% | 425g |
| Whole Wheat Flour | 15% | 75g |
| Water (Total 75%) | 75% | 375g |
| Active Levain (100% hydration) | 20% | 100g |
| Fine Sea Salt | 2% | 10g |
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Explore Master Vault ($27) →Frequently Asked Questions
Does higher hydration always mean a more open crumb?
Not necessarily. While higher hydration provides steam for open pockets, crumb structure is predominantly governed by bulk fermentation timing and gentle dough handling. Over-fermented 80% dough will still bake flat.
Why is my high-hydration dough sticking to everything?
Wet dough adheres to dry hands and dry surfaces. Always work with wet hands during folding, use a stainless steel bench knife for pre-shaping, and dust bannetons generously with gluten-free white rice flour.
Can I bake high-hydration sourdough without a Dutch oven?
Yes, but you will need an inverted baking steel or stone and a heavy cast iron skillet filled with lava rocks and boiling water to supply continuous steam during the first 20 minutes.