Sourdough Hydration Calculator
This precision sourdough hydration calculator calculates your true hydration level in seconds. Master your sourdough flour to water ratio, account for levain contributions, and dial in the perfect dough consistency for every bake.
What is Sourdough Hydration?
Sourdough hydration is the ratio of total water weight to total flour weight in a bread recipe, expressed as a baker's percentage where total flour always equals 100%. It directly dictates dough extensibility, fermentation speed, gluten development, and whether you produce a dense loaf or an open crumb.
When working with artisan dough, hydration controls how your loaf behaves from mixing through baking. High-hydration doughs absorb water during the autolyse phase to develop extensible gluten networks, while lower-hydration recipes create a firmer crumb structure with easy-to-score crusts.
How to Calculate Sourdough Hydration Percentage: True vs. Apparent
Many bakers make the mistake of looking only at the water and flour they pour directly into the mixing bowl. This is called apparent hydration, and it gives you an incomplete picture of your dough.
Your sourdough starter contains both flour and water. A standard 100% hydration starter is built with equal parts flour and water by weight (a 1:1 ratio). Using a dedicated sourdough starter hydration ratio calculator breaks your levain into its solid and liquid components so your total flour weight and total water weight reflect your true dough hydration.
Baker's Percentage Calculator for Sourdough Formula
Use these standard baker's math equations to compute your true recipe hydration:
Example: How Much Water for 70% Hydration Sourdough?
Suppose your recipe uses 500g bread flour, 100g starter at 100% hydration, and you target 70% total hydration:
- Starter provides: 50g flour + 50g water
- Total flour in batch: 500g + 50g = 550g total flour
- Target total water needed: 550g × 0.70 = 385g total water
- Water to pour into bowl: 385g - 50g (from starter) = 335g water
Hydration Targets by Flour & Dough Consistency
Target hydration depends on the protein quality of your flour. Match your recipe to the appropriate dough profile below:
65% – 70%
Beginner / Stiff Dough
Best for all-purpose flour and sandwich loaves. Holds shape cleanly, resists flattening, and delivers steady oven spring.
72% – 78%
Artisan Country Boule
The benchmark for unbleached bread flour. Balances structural strength with an open crumb and crisp, blistered crust.
80% – 88%+
High-Hydration / Slack Dough
Ideal for high-protein whole wheat, rye blends, or ciabatta. Requires deliberate stretch-and-folds to build gluten strength.
Frequently Asked Questions
What is a good hydration percentage for sourdough bread?
A hydration level of 68% to 72% is the sweet spot for most sourdough bread. It provides enough water for a light, open crumb while keeping the dough firm enough to shape easily without spreading flat.
How do you adjust hydration when adding starter to the total flour/water?
Deconstruct your starter into equal parts flour and water before calculating your overall baker's percentage. For a 100% hydration starter, split its weight in half: add 50% to your main flour and 50% to your main water, then divide total water by total flour.
Why is my sourdough dough too sticky or too dry?
Dough turns out too sticky when hydration exceeds your flour's protein absorption capacity or when fermentation breaks down the gluten matrix. Dough feels too dry when using high-absorption whole grain flours without increasing water accordingly.
What hydration is best for beginners vs. high-hydration sourdough?
Beginners should target 65% to 70% hydration to build good handling techniques and ensure strong surface tension. Experienced bakers working on high-hydration sourdough push past 78% to 85% using strong bread flour and structured coil folds.
How does hydration affect crumb and crust in sourdough bread?
Higher hydration creates a thinner, crispier, blistered crust and an open, airy, custardy crumb. Lower hydration produces a thicker crust with a tighter, uniform crumb ideal for sandwich bread.
Sourdough Hydration Calculator
Main Flour & Water
Starter / Levain & Salt
*100% = equal parts water and flour
True Overall Hydration
Stiff & Dense Dough* True hydration accounts for both the flour and water content inside your sourdough starter culture (100% hydration = 1:1 water:flour). Actual dough feel may vary based on flour protein content (e.g., whole wheat vs. bread flour) and ambient kitchen humidity.
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