80% vs 90% Hydration for Sourdough — Which Should You Bake?

Compare 80% and 90% hydration doughs: handling, crumb, fermentation, shaping and baking tips for home sourdough bakers.

Quick Answer

Which hydration should I choose?

80% hydration is the practical, forgiving choice for most home bakers: easier shaping, predictable fermentation and a well-opened crumb. 90% hydration gives a more open, glossy crumb and lighter mouthfeel but requires better technique (stretch-and-folds, wetter bench work, and strong shaping) and usually a longer bulk fermentation or cooler temps to develop strength [1][2].

💡 Start at 80% to build skills; move to 85–90% once you reliably handle wet doughs and understand fermentation timing.

Comparison Table

Property Option A Option B Significance
Ease of handling 80% — Manageable, can be shaped on floured surface 90% — Very slack; requires wet-hand techniques and more use of a [dough scraper](https://amzn.to/3LR1f5E) Higher hydration increases slipperiness and demands different technique [1]
Crumb openness 80% — Open but structured 90% — Much more open, irregular alveoli Water increases starch gelatinization and gas bubble expansion during bake [1][2]
Crust and gloss 80% — Crisp crust, less glassy interior 90% — Thinner crisp crust, glossier crumb interior Higher moisture creates thinner, shinier crumb cell walls
Fermentation speed 80% — Faster bulk rise at same temp 90% — Can feel slower or floppier; often benefits from longer/colder ferment Diffusion and yeast activity are affected by water content and dough structure [1]
Required technique 80% — Standard stretch-and-folds, routine shaping 90% — Frequent folds, coil folds, bench lifts, use of [proofing basket](https://amzn.to/4sNHBYO) Structural development must come from folding and gluten development rather than lower hydration
Baking equipment 80% — Dutch oven recommended for steam 90% — Dutch oven or cloche strongly recommended; use [parchment paper](https://amzn.to/49SkAv0) or sling to transfer High hydration benefits from controlled steam and support during transfer
Risk of spread (flat loaf) 80% — Low to medium 90% — Higher; good shaping and proof control required Overproofed high-hydration dough loses surface tension and spreads

When to Use Which?

Everyday sourdough loaf for sandwiches 80%

Reliable crumb and shape; easier for predictable daily baking [1]

Boulangerie-style open crumb, large irregular holes 90%

Produces the characteristic light, open alveoli when handled well and baked with steam[1][2]

Warm kitchen with active starter 80-85%

Lower hydration reduces risk of overproofing when fermentation runs fast

Long, cold bulk or retarded final proof 85-90%

Extended cold fermentation helps develop strength in very wet doughs and controls yeast activity[2]

Hybrid loaves with whole grain Reduce hydration slightly from wheat-only numbers

Whole grains absorb more water; a 90% wheat dough with 20% whole grain will behave wetter than expected[1]

Can I Mix Both?

Can I mix/adjust hydration mid-process?

Yes. You can start a dough at lower hydration and add more water during the first set of stretch-and-folds (autolyse extension technique). Conversely, for an unexpectedly slack dough, use coil folds and longer bulk to build strength instead of immediately adding flour. When adjusting, weigh using a [digital kitchen scale](https://amzn.to/4pUMVHi) and note changes for repeatability [1][2].

Start 80% + add 2–5% water during folds
→ Gentler transition to 85–87% with more controlled gluten development
Use 85% but add 5–10% whole-grain flour
→ Increased absorption reduces effective hydration; dough behaves closer to 80–83%
Increase hydration for bake day only
→ Can be used to open the crumb slightly if bulk fermentation is underdeveloped, but risks spreading

Converting Recipes Between 80% and 90%

A → B

Flour: Keep flour weight same

Water: Increase water by 10% of flour weight (for 500 g flour, add +50 g water to raise 80% → 90%)

→ Looser dough; plan for more folds, cooler or longer fermentation, and stronger shaping support

B → A

Flour: Keep flour weight same

Water: Reduce water by 10% of flour weight (for 500 g flour, reduce -50 g water to lower 90% → 80%)

→ Tighter dough, easier shaping, slightly denser crumb

💡 When converting, change hydration in 2–5% steps over a few bakes and log results. Use an [instant-read thermometer](https://amzn.to/49Xsgwp) to monitor dough temperature—warmer dough ferments faster which compounds hydration effects [1][2].

Sources

  1. [1]
    The Perfect Loaf – The Perfect Loaf – Link
  2. [2]
    Plötzblog – Plötzblog – Link