Hydration is one of the most talked-about variables in sourdough baking — and one of the most misunderstood. Beginners often chase high-hydration doughs because the open, irregular crumb looks impressive in photos. Experienced bakers know that the “right” hydration isn’t the highest one you can manage. It’s the one that works for your flour, your kitchen, and the bread you actually want to bake.
This guide explains what hydration really means, how it affects every stage of your bake, and how to find the right level for where you are right now.
What Is Sourdough Hydration?
Hydration is simply the ratio of water to flour in your dough, expressed as a percentage.
The formula: (weight of water ÷ weight of flour) × 100 = hydration %
So if your recipe uses 500g of flour and 350g of water: 350 ÷ 500 × 100 = 70% hydration
That’s it. The number tells you how much water is in the dough relative to the flour.
Want to calculate your sourdough hydration? Use this free tool!
What it doesn’t tell you — and this is where most hydration guides fall short — is what that percentage will actually feellike in your hands. Because 70% hydration can feel very different depending on your flour, your water temperature, your kitchen humidity, and how long the dough has fermented. Understanding those variables is what separates bakers who use hydration as a genuine tool from those who just follow a number.
What Hydration Actually Controls
Before getting into the levels, it helps to understand what hydration affects across the whole baking process:
Fermentation speed: Higher hydration doughs ferment faster because water is the medium in which yeast and bacteria are active. At the same temperature, an 80% hydration dough will complete bulk fermentation noticeably faster than a 65% dough. This matters when you’re planning your bake schedule.
Crumb structure: Higher hydration generally produces a more open, irregular crumb with larger holes. Lower hydration produces a tighter, more uniform crumb. Neither is better — they serve different purposes. An open crumb is beautiful in a rustic boule; it’s impractical in a sandwich loaf.
Crust: Higher hydration doughs tend to produce a thinner, crispier crust. Lower hydration doughs produce a thicker, chewier crust.
Handling difficulty: This is the most practically significant effect. Higher hydration doughs are stickier, slacker, and harder to shape. The gluten network is more extensible but less strong. Every technique — stretch and fold, shaping, scoring — is more challenging with a wet dough.
Shelf life: Higher hydration bread tends to stay moist longer because the water is more evenly distributed throughout the crumb.
Hydration Levels Explained
Low Hydration: 60–68%
What it feels like: Firm, smooth, and easy to handle. The dough holds its shape readily, doesn’t stick aggressively to surfaces, and is forgiving to shape.
What it produces: A tighter, more uniform crumb — excellent for sandwich loaves, toast bread, and any recipe where you want slices that hold together cleanly. The crust is slightly thicker and chewier.
Fermentation: Slower than higher hydration doughs at the same temperature. Bulk fermentation may take 30–60 minutes longer.
Best for:
- Beginners building confidence with dough handling
- Sandwich bread and everyday loaves
- Bakers with cool kitchens where higher hydration would ferment too unpredictably
- Enriched doughs (where butter or oil is being added)
The misconception: Many beginners assume low hydration = inferior bread. It doesn’t. Some of the most respected sourdough bakers work primarily at 65–68% hydration because the dough is more controllable and the results are more consistent.
Medium Hydration: 68–75%
What it feels like: Soft and slightly tacky, but manageable. The dough stretches well without tearing and builds good strength through stretch and fold sets. It will stick to your hands if you’re not using wet hands or a scraper, but it holds together and shapes with reasonable ease.
What it produces: A good balance of open crumb and structure. The holes are more irregular than a low-hydration loaf, the crumb is lighter and airier, and the crust is thinner. This is the range that most sourdough recipes are written for, and it produces what most people picture when they think of a classic sourdough loaf.
Fermentation: Moves at a predictable pace in most kitchens. This is the easiest range to time reliably.
Best for:
- Most everyday sourdough baking
- Bakers who want an open crumb without extreme stickiness
- Recipes that call for overnight cold proof
- The “sweet spot” range for home bakers at most skill levels
The sweet spot within the sweet spot: 72–73% is where many experienced home bakers land for their standard loaf. Open enough to be interesting, manageable enough to shape consistently.
High Hydration: 75–85%+
What it feels like: Slack, wet, and sticky. The dough spreads significantly when you stop supporting it. Shaping requires confident technique — gentle handling collapses the structure. This is the range that intimidates most beginners and humbles many intermediate bakers.
What it produces: The dramatic open crumb with large, irregular holes that you see in professional bakery photos. A thin, crackly crust. A custardy, almost creamy texture between the holes. This is the style most associated with artisan sourdough.
Fermentation: Fast. A high-hydration dough can over-ferment quickly, especially in warm kitchens. The window between perfectly proofed and over-proofed is narrower.
Best for:
- Experienced bakers with strong shaping technique
- Ciabatta, focaccia, and rustic boules where an open crumb is the goal
- Bakers who have mastered lower hydration and want a new challenge
The honest truth: Most of the stunning open-crumb photos you see online are high-hydration doughs baked by people with strong technique and sometimes commercial equipment. If your high-hydration loaves keep spreading sideways or producing a gummy crumb, the answer isn’t to push hydration higher — it’s to develop your technique at a lower hydration first.
How Flour Type Changes Everything
Here’s what most hydration guides don’t tell you clearly enough: the same hydration percentage behaves completely differently in different flours.
Bread flour (12–14% protein) absorbs significantly more water than all-purpose flour. A 75% hydration dough made with bread flour will feel noticeably stiffer than a 75% dough made with all-purpose. If you substitute all-purpose for bread flour in a recipe without reducing water, your effective hydration is higher than intended.
Whole wheat flour has bran particles that absorb water slowly but absorb more of it overall. A dough with 20% whole wheat will continue absorbing water for 30–60 minutes after mixing, becoming less sticky as it rests. When using whole wheat, autolyse (resting the flour and water before adding starter) is especially valuable.
Rye flour absorbs more water than any other common bread flour. Even a small percentage of rye — 10–15% — noticeably changes how a dough feels. Rye also doesn’t form gluten the same way wheat does, which means high-rye doughs are inherently stickier regardless of hydration.
Stone-ground and whole grain flours generally need more water than their refined counterparts. If you switch to a stone-ground flour without adjusting your water, your dough will feel stiffer than expected.
The practical rule: When switching flour types or brands, reduce your water by 20–30g from what the recipe states and add more gradually until the dough feels right. It’s easier to add water than to correct an overly wet dough.
How to Handle High-Hydration Dough
If you’re working at 75%+ hydration, these techniques make the difference between manageable and maddening:
Wet hands, always. Keep a small bowl of water nearby and dip your hands before every time you touch the dough. Wet hands glide over sticky surfaces instead of dragging and tearing.
Coil folds over stretch and folds. At very high hydration, coil folds (picking the dough up from the center and folding it under itself) build strength more effectively than standard stretch and folds. Do 4–6 sets in the first 2 hours of bulk.
Cold shaping. Shape straight from the fridge after an overnight retard. Cold dough is dramatically more manageable than room-temperature high-hydration dough — it holds its shape long enough to score cleanly and retains structure going into the Dutch oven.
Bench scraper over hands. Use the scraper to move, fold, and tension the dough rather than your hands. You can build more shaping tension with a scraper than by hand on a wet dough.
Rice flour in the banneton. Regular flour gets absorbed into a wet dough surface. Rice flour doesn’t, which prevents the dough from sticking in the banneton. Dust generously.
Choosing Your Hydration — A Decision Guide
You want an open, airy crumb with big holes: → Work up to 75–78% with bread flour. Master shaping first.
You want a reliable everyday loaf with good texture: → 70–73% is your range. Consistent, manageable, delicious.
You’re a beginner or recently had frustrating results: → Start at 65–68%. Build technique. Increase gradually.
Your kitchen is warm (above 76°F in summer): → Reduce hydration slightly — 2–3% lower than your usual. Warm kitchens make high-hydration doughs ferment unpredictably fast.
You’re using whole wheat or rye flour: → Increase water by 2–5% compared to an all-white flour recipe. These flours need it.
You’re baking same-day (no overnight cold proof): → Use 68–70% maximum. Without cold firming, high-hydration dough is very hard to shape in a same-day bake.
A Note on Hydration Inflation
There’s a tendency in sourdough communities online to treat higher hydration as inherently more skilled or desirable. It isn’t. Hydration is a tool — the right level is whichever one produces the bread you want to make, consistently, in your kitchen, with your flour.
Many professional bakers work at 72–75% hydration for their standard loaves and reserve higher hydration for specific styles. The bakers who consistently produce the best bread aren’t the ones chasing the highest hydration number — they’re the ones who have found their hydration and mastered it.
Frequently Asked Questions
What hydration is best for beginners? Start at 65–68%. You’ll still get a lovely open crumb and good flavor, and you’ll be able to focus on technique rather than fighting sticky dough. Increase hydration once your shaping is consistent and your loaves are reliable.
Does higher hydration make sourdough taste better? No — flavor comes from fermentation time, starter health, flour quality, and salt. A well-fermented 68% hydration loaf will taste better than a poorly fermented 80% loaf every time.
Why does my 72% hydration dough feel wetter than someone else’s? Flour differences. Your flour may be lower in protein or a softer variety that absorbs less water. Try bread flour if you’re using all-purpose, or reduce your water by 20g and see if it feels more manageable.
Can I add more flour if my dough is too sticky? Once dough has been mixed and fermentation has started, adding flour disrupts the structure and creates uneven hydration pockets. Instead, chill the dough for 20–30 minutes to firm it up, use wet hands and a bench scraper to manage the stickiness, or note the issue and reduce water on your next bake.
Why does my dough get stickier as bulk fermentation goes on? As fermentation progresses, enzymes break down gluten gradually, making the dough progressively slacker. This is normal — your dough will always feel looser at the end of bulk than at the beginning. If it becomes unmanageable, fermentation has gone too long.
What’s the highest hydration I should attempt as a beginner? 72–73% is a reasonable ceiling while you’re learning. Once you can shape consistently and your loaves hold their structure through baking, you can experiment with higher percentages.
The Bottom Line
Hydration is one of the most powerful dials you can turn in sourdough baking — but it’s most useful when you understand what you’re turning it for. Lower hydration for structure, control, and consistency. Higher hydration for open crumb and challenge. The middle range for most of what most bakers bake most of the time.
Master your technique at whatever hydration is manageable right now. The open crumb will follow.
Related guides:
- Sourdough Hydration Calculator — Free tool to help calculate proper hydration
- Sourdough Too Sticky? Here’s How to Fix It — handling wet dough at any hydration
- Best Temperature for Sourdough Fermentation — how temperature and hydration interact
- Why Did My Sourdough Spread Sideways? — often a hydration + technique issue
- Same Day Sourdough — hydration recommendations for a fast bake
- Easy Sourdough Recipe With Starter — a reliable 70% hydration beginner loaf