What hydration percentage actually tells you
Hydration is the ratio of water weight to flour weight, expressed as a percentage — 65% hydration means the water weighs 65% of what the flour weighs (500g flour, 325g water). It's the single most useful number for predicting how a dough will behave before you even mix it: lower hydration doughs (55-65%) are firm, easy to shape by hand, and typical of sandwich loaves and bagels. Higher hydration doughs (70-85%+) are wetter, stickier, and harder to handle without practice, but produce the open, irregular crumb structure typical of artisan sourdough and ciabatta.
Why this matters more than following a recipe's cup measurements
Flour absorbs water differently depending on protein content, age, and even humidity where you live — a cup-measured recipe assumes a specific flour behavior that may not match yours exactly. Knowing the target hydration percentage lets you adjust water by feel (the dough should look a certain way at a given hydration) rather than blindly trusting a cup measurement that was calibrated for someone else's flour and climate.
Quick reference chart
| Hydration | Typical use |
|---|---|
| 55-60% | Bagels, pretzels (dense, chewy) |
| 60-65% | Sandwich bread, standard loaves |
| 65-75% | Rustic artisan loaves, sourdough |
| 75-90%+ | Ciabatta, very open-crumb breads |
FAQ
Does milk or egg count toward hydration? Advanced bakers sometimes include other liquid ingredients' water content in a "total hydration" figure, but a basic hydration calculation like this one typically just uses added water.
Why does my dough feel different at the "same" hydration as a recipe I've seen?Flour brands and protein content absorb water differently — the same percentage can feel wetter or drier depending on your specific flour, which is why experienced bakers treat hydration as a strong starting point to adjust from, not an absolute guarantee.