What is Sourdough Hydration and Why Does It Matter?
Hydration is arguably the most talked-about metric in artisan sourdough baking. It refers directly to the ratio of water to flour in your dough recipe. The higher the hydration, the more water is in the dough. Understanding this number allows you to predict how your dough will handle during stretch and folds, how it will proof, and how it will bake (oven spring). Using a sourdough hydration calculator ensures precision before you even mix your ingredients.
True Hydration vs. Recipe Hydration
Many beginner bakers make a critical mistake when calculating hydration: they ignore the water and flour hiding inside their active sourdough starter.
If your starter is fed at a standard 1:1:1 ratio (equal parts starter, flour, and water by weight), it sits at 100% hydration. This means that if you add 100 grams of sourdough starter to your dough, you are actually adding an additional 50 grams of flour and 50 grams of water.
Our free Sourdough Hydration Calculator automatically deconstructs your levain based on its hydration percentage, giving you the True Hydration of your final dough. This prevents wet, sticky, unmanageable surprises, making it an essential bread dough calculator for both beginners and experts!
What Hydration Percentage Should I Use?
- 60% - 65% (Stiff Dough): Very easy to handle and shape. Produces a tighter, sandwich-style crumb. Excellent for sandwich bread, sourdough bagels, or pizza dough.
- 68% - 75% (Standard Dough): The sweet spot for most artisan sourdough loaves (boules and batards). You get a perfect balance of structure, ease of handling, and an open, airy crumb.
- 78% - 85%+ (High Hydration): Difficult to handle. Requires specialized stretch-and-fold techniques, lamination, and a very strong bread flour (high protein content). Rewards the skilled baker with a very open crumb (large, glossy holes) and a thin, crispy crust.
Understanding Baker's Percentages
Baker's Percentages (or Baker's Math) are the universal language of commercial and home baking. Instead of viewing a bread recipe as absolute quantities (e.g., "3 cups of flour" or "500g water"), artisan bakers view all ingredients in relation to the total flour weight. Our built-in bakers percentage calculator does this automatically.
The total flour weight in the recipe is always 100%. If you have 1000g of flour and 700g of water, your water percentage is 70% (70% hydration). If you have 20g of salt, your salt percentage is 2%. This mathematical framework allows you to seamlessly scale a true sourdough recipe up to make 10 loaves for a micro-bakery, or scale it down to make a single rustic roll, without ever breaking a sweat.