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Home Baking · June 22, 2026 · 7 min read

The Ultimate Sourdough Hydration Cheat Sheet (75%, 80%, 85% Compared)

A hands-on comparison of the same sourdough at 75%, 80%, and 85% hydration, with baker's math, a side-by-side table, technique adjustments for wetter dough, flour guidance, and troubleshooting for slack dough.

By FluxWriter Team

Sourdough hydration is the single number that does the most to shape your crumb, and it trips up more home bakers than anything else. The promise of a wetter dough is real: higher hydration tends toward a more open, custardy crumb with those Instagram-worthy holes. But it only delivers if your timing, shaping, and flour are all pulling in the same direction. Push the water up without adjusting your technique and you get a flat, gummy pancake instead of a tall, airy loaf.

This is a side-by-side look at the same dough taken to 75%, 80%, and 85%, so you can see exactly what changes and decide where your kitchen, your flour, and your patience actually land.

What hydration percentage actually means

Hydration is just the weight of water expressed as a percentage of the weight of flour. That's it. It is not a percentage of the total dough, which is the mistake that throws people off when the math feels weird.

Here's the formula:

Hydration % = (water weight ÷ flour weight) × 100

So if you mix 1,000 grams of flour with 750 grams of water, that's 75% hydration. Bump the water to 800 grams and you're at 80%. To go the other direction and hit a target, multiply your flour by the decimal: 1,000 g flour × 0.80 = 800 g water.

A few things bakers always forget to fold into the math:

• The water in your starter counts. A 100% hydration starter is half flour, half water by weight. If your recipe uses 200 g of that starter, you're adding 100 g flour and 100 g water to the totals before you even touch the main mix.
• Salt does not change hydration. It's typically 2% of flour weight (20 g per 1,000 g flour), tracked separately.
• A digital scale is non-negotiable. Volume measuring will swing your hydration by 10 points without you noticing. A $12 kitchen scale like the Etekcit or Ozeri pays for itself the first weekend.

Once you can calculate it, you can compare it, which is the whole point of what follows.

The same dough at 75%, 80%, and 85%

I baked three loaves the same week: identical flour blend (90% King Arthur Bread Flour, 10% whole wheat), identical 20% starter inoculation, identical 78°F kitchen, identical 30-minute autolyse. The only variable was water. Here's how they behaved.

The honest takeaway: 75% is the reliable workhorse, 80% is the sweet spot where you get a noticeably more open crumb without fighting the dough, and 85% is where the gains get marginal and the failure rate climbs. Unless you're chasing a specific ciabatta-style crumb, 78–82% is where most well-developed loaves live.

How to adjust technique as hydration climbs

You cannot run an 85% dough with your 70% playbook. As the water goes up, you trade kneading strength for time and gentle structure-building. Here's what changes at each stage.

Mixing

At 75% you can mix by hand and shaggily incorporate everything in a couple of minutes. At 80% and above, do a proper autolyse first — mix just flour and water, rest 30 to 60 minutes, then add starter and salt. The autolyse lets the flour fully hydrate and the gluten start organizing on its own, which buys you strength you'd otherwise have to develop by force.

For high hydration, use the Rubaud method during initial mix: slide a wet hand under the dough, lift, and slap it back over itself for two to three minutes. It develops gluten without adding flour to your hands.

Stretch-and-folds

This is your main structure tool above 75%. Do them in the first 2 hours of bulk, spaced 30 minutes apart.

• 75–78%: classic stretch-and-folds, grabbing one side and folding to the opposite, 3 sets.
• 80%+: switch to coil folds. Lift the dough from the center with both hands, let the ends drape and tuck under, rotate 90°, repeat. Coil folds are far gentler on a slack dough and tighten it without tearing.

Wet your hands every single time. Dry hands plus wet dough equals a torn, sticky mess.

Shaping a wet dough

Shaping is where high hydration loaves are won or lost. Three rules:

1. Use a generous bench flour. A rice flour and all-purpose blend (50/50) won't absorb into the dough and prevents sticking far better than plain wheat flour.
2. Pre-shape, then rest 20–30 minutes before final shaping. The rest relaxes the gluten so the dough cooperates.
3. Build surface tension with a bench scraper, not your hands. Drag the dough toward you across an unfloured patch of counter to tighten the skin. For an 85% dough, the scraper is the only thing keeping it together.

Then into a well-floured banneton, seam up, and straight into the fridge for a cold retard overnight. Cold dough is firm dough, and a 12-hour retard at 38°F makes even an 85% loaf scoreable in the morning.

Flour and protein content

Water doesn't hold itself up; protein does. A flour's protein percentage determines how much water it can absorb and still form a strong gluten network. This is why two bakers at "the same hydration" get wildly different results.

• All-purpose flour (10–11.7% protein): struggles above 72–75%. King Arthur AP at 11.7% is the strongest of the supermarket AP flours and can stretch a little higher.
• Bread flour (12.7% protein): the practical baseline. King Arthur Bread Flour handles 78–80% comfortably.
• High-protein/high-extraction (13–14%+): flours like King Arthur Sir Galahad (pro line), or strong European flours, are what you want before attempting 85%+.
• Whole grain flours are thirsty. Adding 10–20% whole wheat or rye absorbs more water, so a 80% whole-grain blend feels stiffer than an 80% white dough. Account for this by adding 2–3% more water when you increase whole grain.

If your loaves spread no matter what you do, the flour is often the real ceiling, not your technique. Switch to a true bread flour before blaming yourself.

Troubleshooting a slack dough

A dough that won't hold shape isn't always over-hydrated. Run through this list before you dump in more flour.

• It's puddling during bulk: likely under-developed gluten. Add another set of coil folds and give it 30 more minutes. The dough should become noticeably more cohesive and start doming.
• It's slack and full of large bubbles, smells boozy: that's over-fermentation. The gluten has been digested by the enzymes and acids. Next time, end bulk sooner — look for 30–50% volume increase and a jiggly, domed surface, not "doubled."
• It sticks to everything and tears: not enough surface flour and dry hands. Wet your hands, switch to rice flour on the bench, and use the scraper.
• It bakes flat and gummy inside: could be under-baked. Bake covered for 20 minutes at 500°F, then uncovered at 450°F until the internal temp hits 205–210°F. A gummy crumb on a properly fermented loaf is almost always temperature, not hydration.
• Genuinely too wet for your flour: reduce hydration by 3–5% next bake. There's no medal for 85% if 78% gives you a better loaf.

Frequently asked questions

What hydration should a beginner start with?

Start at 70–72% with a good bread flour. It's forgiving, holds its shape on the bench, and still gives you a respectable open crumb. Nail your timing and shaping there for a few bakes, then climb in 3–5% increments once each level feels easy.

Why is my high-hydration dough flat and dense?

Almost always one of two things: under-developed gluten or over-fermentation. If the dough never built strength during bulk, add more coil folds; if it smells alcoholic and is full of huge bubbles, you fermented too long. Hydration gets blamed far more often than it deserves.

Does higher hydration always mean a more open crumb?

No. Hydration only opens the crumb if fermentation, gluten development, and shaping are all dialed in. A well-handled 75% loaf will out-crumb a sloppy 85% one every time. Water raises the ceiling; technique decides whether you reach it.

The bottom line

Hydration is a lever, not a magic number, and 78–82% is where most home bakers get the best open crumb for the least frustration. Match your water to your flour's protein, lean on coil folds and a cold retard as you go wetter, and remember that a perfectly fermented 75% loaf beats a mishandled 85% one every single time. Climb slowly, change one variable at a time, and let the dough tell you when it's ready for more.

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