What is True Sourdough Hydration?
Many amateur sourdough recipes calculate hydration simply as (rac{ ext{Added Water}}{ ext{Main Flour}}). However, a standard 100% hydration sourdough starter is half water and half flour by weight! If you add 100 grams of starter to 500g flour and 350g water, you are actually introducing an extra 50g of water and 50g of flour.
Understanding Baker's Percentages
In professional baking, all ingredient weights are expressed as a percentage of the Total Flour Weight (defined strictly as 100%). This allows scaling any recipe from a single 800g loaf to a commercial 500 kg batch without altering dough fermentation or crumb texture.
Hydration vs Crumb Structure
- 65% to 70% Hydration: Stiffer dough, tight uniform crumb, easy to shape into tight boules with dramatic ear blisters.
- 75% to 80% Hydration: Soft, supple artisan dough producing wild, irregular honeycomb open crumbs (alveoli). Requires strong gluten development via stretch-and-folds.
- 82%+ Hydration: Extreme open crumb, pudding-like dough texture suited for focaccia or Roman pizza al taglio.