Dough hydration is the weight of water divided by the weight of flour, multiplied by 100. A dough with 700 g of water and 1,000 g of flour is 70% hydration. That single number determines how sticky the dough is to handle, how open the crumb will be, and how the loaf behaves in the oven.
Hydration is expressed as part of baker’s percentage, where flour always equals 100%.
What Changes With Hydration
Three things shift as you add water:
- Crumb openness. Steam trapped in a wetter dough expands more aggressively in the oven, creating larger irregular holes. Baguettes and sourdough batards need this; sandwich bread does not.
- Handling difficulty. Every 5-point increase in hydration makes the dough measurably slacker and stickier. A 65% dough can be kneaded on a bare counter; an 80% dough needs wet hands, a bench scraper, and coil folds.
- Fermentation speed. Higher hydration gives enzymes more room to move, speeding up both gluten development and fermentation. A 75%+ dough may finish bulk fermentation 10–20% faster than a 65% dough at the same temperature.
Hydration Ranges by Bread Type
| Bread | Typical hydration | Crumb character | Handling |
|---|---|---|---|
| Bagel | 55–60% | Tight, chewy | Easy — stiff dough |
| Sandwich loaf | 62–68% | Soft, fine crumb | Moderate |
| Brioche | 45–65% (plus eggs/butter) | Pillowy, tender | Moderate |
| Baguette | 65–68% | Medium-open | Moderate |
| Country sourdough | 70–75% | Open, irregular | Moderate–tricky |
| Focaccia | 75–80% | Very open, spongy | Pour into oiled pan |
| Ciabatta | 78–85% | Very open, lacy | Needs a tub + folds |
| Pan de Cristal | 90–100% | Extremely open | Expert only |
Source: King Arthur Baking pro reference; Martin Philip, baker’s math guide.
Worked Example: Adjusting Hydration
You find a country loaf recipe at 75% hydration but want to drop it to 70% to practice shaping. You are using 500 g of flour.
Original: 500 × 0.75 = 375 g water Target: 500 × 0.70 = 350 g water Reduction: 25 g less water
That is the only change. Every other ingredient stays the same. The dough will be firmer, easier to shape, and will have a slightly tighter crumb.
What Counts as “Water” in Hydration
Only liquids that are primarily water count toward hydration:
- Water (obviously)
- Milk (about 88% water — most bakers count it at full weight)
- Beer or coffee (count at full weight)
These do NOT count toward hydration:
- Olive oil, butter, vegetable oil
- Honey, molasses, liquid sweeteners
- Eggs (some bakers include eggs at 75% of their weight, but it is not standard)
How Flour Type Affects Effective Hydration
Different flours absorb water at different rates:
| Flour | Absorption vs. all-purpose | Notes |
|---|---|---|
| All-purpose | Baseline | 10–11.5% protein |
| Bread flour | Similar or slightly more | 11.5–13% protein |
| Whole wheat | Needs 5–10% more water | Bran absorbs aggressively |
| Rye | Needs 5–15% more water | Very thirsty; absorbs slowly |
| Spelt | Needs 5% more water | Weaker gluten than wheat |
If you swap all-purpose for whole wheat at the same hydration, the dough will feel stiffer. Add water 10 g at a time until the texture matches what you expect.
Autolyse and How It Changes Apparent Hydration
Autolyse is a rest period — usually 20–60 minutes — taken after mixing flour and water, before adding salt and yeast or starter. During autolyse, flour proteins begin hydrating and gluten forms without mechanical work. After autolyse, the dough feels significantly less sticky at the same hydration percentage, because the flour has fully absorbed the water.
This means a 75% hydration dough that feels impossibly wet right after mixing will handle noticeably better after a 30-minute autolyse. If you struggle with high-hydration doughs, try autolyse before reducing hydration — the percentage is still 75%, but the experience is closer to 70%.
Final Dough Temperature and Hydration
Water temperature is the easiest tool for controlling dough temperature after mixing. Friction from kneading can raise dough temperature 2–6°F. The target dough temperature for most lean breads is 75–78°F (24–26°C).
To hit a target Final Dough Temperature (FDT):
Water temperature = (FDT × 3) − flour temperature − room temperature − friction factor
Friction factor from a stand mixer is typically 20–25°F. Example: target FDT of 76°F, room temperature 70°F, flour temperature 68°F, friction factor 22°F:
Water temperature = (76 × 3) − 70 − 68 − 22 = 228 − 160 = 68°F
In summer when flour is warmer, you may need ice-cold water. In winter, use warm tap water.
Adjusting Hydration in Practice
Start at the lower end of any range for a new recipe. Once you can shape the dough cleanly and score it without deflation, add 5% more water to the next batch. Keep a note — flour brands vary in protein content and absorption, so your “70%” may behave like another baker’s “67%.”
Use the baker’s percentage calculator to compute exact gram amounts for any flour weight and target hydration.
For how temperature affects dough at any hydration, see the bulk fermentation temperature guide.