Sourdough hydration guide: 65% vs 75% vs 85%

If you’ve spent any time in sourdough circles, you know hydration is one of those topics that comes up constantly. People throw percentages around like they’re trading cards: “Oh, I bake at 82%.” “I pushed mine to 90% last weekend.” It can feel like higher hydration equals better bread, or that you’re somehow failing if you’re not wrestling with a puddle of dough.

Here’s the truth: hydration is a tool, not a trophy. The right percentage depends on your flour, your environment, your schedule, and honestly, what you’re trying to eat at the end of the bake. This guide breaks down the practical differences between 65%, 75%, and 85% hydration doughs so you can make an informed choice, not just chase a number.

What hydration actually means

Hydration in baker’s percentages is simple: it’s the weight of water divided by the weight of flour, multiplied by 100. So a dough with 500g of flour and 375g of water is 75% hydration.

This matters because flour and water interact at a molecular level. Higher hydration means more free water in the dough, which affects gluten development, fermentation speed, crumb structure, and how the dough handles under your hands. Getting a feel for these differences is what separates bakers who follow recipes blindly from bakers who actually understand their dough.

If you want to skip the math and just dial in a ratio, the CrumbDesk Hydration Calculator does this instantly for any batch size.

65% hydration: the workhorse loaf

A 65% dough is stiff, manageable, and forgiving. If you’re newer to sourdough or baking in a humid kitchen with weaker flour, this is a great place to start.

What to expect:

Dough that holds its shape well and is easy to pre-shape and shape
A tighter, more uniform crumb, which is ideal for sandwiches
A slightly chewier texture with a well-defined crust
More tolerance for mistakes in shaping and timing

Where it shines: Sandwich loaves, pan breads, and situations where you need the dough to cooperate (think: baking with kids, or a chaotic weekend). Whole wheat and rye blends also tend to absorb water more aggressively, so 65% with those flours produces a workable dough where 75% might turn soupy.

Trade-offs: You won’t get the dramatic open crumb that shows up on social media. The loaf will be delicious and reliable, but not necessarily photogenic. That’s a fair trade for most real-world baking.

75% hydration: the sweet spot for most bakers

This is where most sourdough recipes land, and for good reason. At 75%, dough is extensible enough to develop a nice open crumb but structured enough to shape without too much frustration.

What to expect:

A soft, slightly tacky dough that responds well to stretch and fold
An open, irregular crumb with some nice air pockets
A crackly, well-blistered crust when baked in a Dutch oven
Moderate handling challenge, manageable with practice

Where it shines: General country loaves, batards, and boules. This range is where most flour performs well, including bread flour, all-purpose, and light whole wheat blends. If you’re following a standard sourdough recipe, it’s almost certainly targeting this range.

One thing to keep in mind: fermentation behavior changes with hydration. A wetter dough tends to ferment faster because enzymatic activity increases with more free water. If you’re baking at 75% and your timing feels off, it’s worth checking your bulk fermentation targets. The CrumbDesk Bulk Fermentation Calculator can help you dial in timing based on your starter percentage and temperature.

85% hydration: high-wire baking

This is the range where things get exciting and humbling. An 85% dough is genuinely challenging to handle. It spreads, it sticks, it resists shaping, and it requires either a lot of experience or a very cold final proof to behave.

What to expect:

A wet, extensible dough that’s difficult to shape without strong technique
A very open, irregular crumb with large holes (when it works)
An extraordinarily thin, shattering crust
High sensitivity to fermentation timing and temperature

Where it shines: Ciabatta-style loaves, open-crumb batards, and any bake where you want maximum interior texture over structural tidy-ness. Bakers using very strong, high-protein flour (13%+ protein) can handle this hydration more easily because the gluten network is stronger and holds more water without collapsing.

Where it fights back: Whole grain flours, lower-protein all-purpose, and warm kitchens all make 85% harder to manage. The dough will spread during scoring and lose oven spring if fermentation isn’t exactly right.

If you’re scaling a recipe up or down at this hydration, be precise. Even small changes in flour weight shift the ratio meaningfully. Use the CrumbDesk Recipe Scaler to keep your ratios accurate when adjusting batch size.

Factors that change how hydration behaves

The same 75% dough can feel completely different depending on a few variables:

Flour protein content. Higher protein flour absorbs more water. A 75% dough with bread flour feels stiffer than the same ratio with all-purpose.

Whole grain percentage. Bran particles absorb water and cut gluten strands. Whole wheat and rye effectively “tighten” dough, so you can often push hydration higher with these flours.

Ambient temperature. Warm kitchens accelerate fermentation and make dough slacker. What feels like a firm 75% dough in winter can feel loose and sticky in August.

Autolyse. Letting flour hydrate fully before adding starter and salt changes how the dough feels at the same percentage. Post-autolyse dough is smoother and more extensible.

Your hands. Experienced bakers can handle wetter doughs because they’ve developed a feel for tension-building techniques like coil folds and lamination. The dough hasn’t changed; the baker has.

Choosing your hydration

Here’s a simple framework:

Starting out or using weaker flour: Start at 68-72%. Get comfortable with the process before chasing open crumb.
Established process, bread flour: 74-78% gives great results with manageable dough.
Strong flour, good technique, cold proofing: 80-85% when you want to push for maximum openness.
Whole grain blends: Add 2-5% hydration versus your usual amount for an equivalent feel.

And remember: consistency matters more than hydration. Baking the same formula repeatedly teaches you more than jumping between percentages trying to crack the code.

FAQ

Does higher hydration always mean a more open crumb?

Not automatically. Open crumb depends on fermentation timing, shaping tension, scoring, and oven temperature as much as hydration. You can bake an 85% loaf with a tight crumb if it’s underproofed, and a beautifully open 72% loaf with good technique and timing.

Why does my high-hydration dough spread flat instead of rising?

Usually this comes down to one of three things: overproofing (the gluten structure has weakened), underproofing (not enough gas to expand in the oven), or weak flour that can’t hold the water. Try dropping hydration by 5% and see if your oven spring improves.

Can I adjust hydration mid-recipe if my dough feels wrong?

Yes, with care. If dough is too stiff early on, you can wet your hands during stretch and folds to incorporate a little extra water. If it’s too wet, working the dough on a dry surface during lamination pulls some moisture out through evaporation. These are small adjustments, not fixes for a fundamentally off ratio.

How does starter hydration affect overall dough hydration?

It does, and most recipes account for it. A 100% hydration starter (equal weights flour and water) adds both flour and water to your dough. If your recipe calls for 100g of starter, that’s approximately 50g flour and 50g water contributing to your totals. Most standard recipes already factor this in, but if you’re building your own formula, count it.

What’s the best hydration for a beginner?

Somewhere around 70-72% is a genuinely good starting point. It’s forgiving enough to handle without feeling slimy, and you’ll still get a satisfying open crumb once your fermentation timing is on track.

Ready to stop guessing and start calculating? The CrumbDesk Hydration Calculator lets you plug in your flour weight and target hydration and instantly get exact water amounts for any batch size. No math, no margin for error.