Hydration Percentage in Bread: What the Number Actually Means

Hydration percentage is one of the few numerical levers in bread baking that has a direct, predictable effect on the finished loaf. Most other variables, ferment time, temperature, salt level, scoring, oven type, interact in messy ways that only experience can sort out. Hydration is more straightforward. Each 5 percent change up or down maps to a recognizable change in how the dough feels, how the crumb sets, and what tools and technique are needed to handle it. Once a baker internalizes that mapping, recipes from different sources start making sense and adjustments to fit a particular flour or oven become routine rather than guesswork.

The trouble is that recipe instructions usually give the hydration percentage without explaining what it means in practice. A new baker sees 75 percent and tries to muscle the dough the way they would muscle a 65 percent dough, and the whole thing turns into a sticky mess. This article walks through what the number actually represents, how to calculate it, and what each range feels like and produces.

How the math works

Hydration percentage in baker’s math is the weight of water divided by the weight of flour, expressed as a percentage. The total weight of the dough is more than 100 percent because flour is the denominator (always set to 100 percent) and every other ingredient is expressed as a percentage of the flour weight.

For a dough with 500 g flour and 350 g water:

• Flour: 500 g, which is 100 percent
• Water: 350 g, which is 350 divided by 500 times 100, equals 70 percent
• Hydration: 70 percent

Salt, yeast, and other ingredients get their own percentages of the flour weight, but they do not count toward hydration unless they contain meaningful water.

Other liquid ingredients can be tricky. Milk is roughly 87 percent water by weight. Eggs are roughly 75 percent water. Butter is roughly 16 percent water. For most home bread recipes you can treat milk and water as equivalent if hydration is below 75 percent. At higher hydration the difference starts to matter because milk solids stiffen the dough.

Sourdough starter complicates the math because the starter itself has its own hydration. A 100 percent hydration starter (equal weights of flour and water) at 100 g contributes 50 g of flour and 50 g of water to the recipe. Most modern sourdough recipes account for this in their stated total hydration, but home bakers writing their own should remember to add the starter components to the totals.

What each range feels like

Different hydration ranges produce different dough behaviors. The break points below assume strong bread flour with about 12 percent protein and standard 2 percent salt.

60 to 65 percent. Firm, slightly stiff dough. Easy to handle and shape. Holds its form on the bench. Suitable for sandwich loaves, bagels, pretzels, and breads where a tight crumb is desirable. Beginner-friendly.

66 to 70 percent. Softer but still firm. The dough cleans the bowl after kneading and holds a domed shape when balled. Suitable for pan loaves, soft dinner rolls, baguette doughs, and most basic artisan loaves. This is the standard range for most home bread recipes.

71 to 75 percent. Noticeably softer and slightly sticky. The dough wants to spread on the bench and benefits from a banneton during proofing. Folding rather than aggressive kneading works better. Suitable for boules, batards, country loaves with character, and many basic sourdoughs.

76 to 80 percent. Quite slack. The dough is wet to the touch and spreads if not contained. Coil folds during bulk fermentation are usually required. Shaping requires a wet hand or bench scraper rather than dry hands. Suitable for open-crumb sourdough, ciabatta, focaccia, and breads where large irregular holes are wanted.

81 to 85 percent. Very slack, almost batter-like at the start. Shaping is difficult and requires technique. Most home bakers find this range hard to control. Suitable for advanced ciabatta, very open-crumb sourdough, and certain Italian breads.

Above 85 percent. Pourable batter range. Used for some focaccias and specific Italian regional breads. Generally requires a pan to contain the shape during baking.

How hydration affects the finished loaf

Higher hydration produces a more open crumb because the gluten network has more room to stretch before tearing. Gas bubbles produced by yeast can grow larger and merge with neighbors before the membrane fails. The crumb looks irregular, with holes of varied sizes.

Lower hydration produces a tighter, more uniform crumb. The gluten network is denser and the bubbles cannot expand as far. Sandwich bread, dinner rolls, and bagels all live in the lower-hydration range because that tight uniform texture is what they should have.

Higher hydration produces a thinner, crispier crust because the extra surface water turns to steam during oven spring and helps the crust crack open. Lower hydration produces a thicker, softer crust because less surface steam is generated.

Higher hydration extends shelf life. The extra moisture in the crumb keeps the loaf softer for longer. A 75 percent hydration country loaf wrapped in cloth stays fresh for 3 to 4 days. A 65 percent pan loaf stays fresh for 2 to 3 days under the same conditions.

Higher hydration produces stronger flavor because the wetter environment supports more enzyme activity and more complex fermentation. A 75 percent sourdough develops more sour, malty, and complex notes than a 65 percent sourdough at the same fermentation time.

What changes with hydration

The handling changes. At 65 percent you can lift and stretch the dough freely with dry hands. At 75 percent you need wet hands or a bench scraper. At 80 percent the dough is wet enough that even wet hands stick unless you work fast.

The mixing changes. At low hydration, aggressive kneading is the standard tool for development. At high hydration, kneading sticks and tears the dough. Stretch-and-fold during bulk fermentation replaces the bulk of mechanical development. The water itself does most of the protein alignment.

The fermentation timing changes. Higher hydration doughs ferment slightly faster because the yeast and enzymes have more water to work in. A 70 percent dough that takes 4 hours at room temperature might be done in 3 hours at 80 percent.

The shaping changes. Low-hydration dough takes a clean tight shape. High-hydration dough takes a gentler, looser shape because aggressive shaping squeezes out the gas you spent hours building up. Pre-shape and final shape both need a lighter touch.

The baking environment changes. High-hydration loaves benefit more from steam in the early oven phase because their thinner crust is more responsive to humidity. Most home methods (Dutch oven, ice cubes in a pan, or a wet towel on the bottom rack) make a bigger visible difference on a 75 percent loaf than on a 65 percent loaf.

How to pick the right hydration

For a given recipe, the hydration should match the goal. Pan loaves with even sandwich-suitable crumb: 65 to 68 percent. Soft dinner rolls: 60 to 65 percent. Baguettes with a balance of open crumb and structure: 68 to 72 percent. Country boules with character: 72 to 76 percent. Open-crumb sourdough: 76 to 82 percent. Ciabatta: 80 to 85 percent. Focaccia: 80 to 90 percent.

When swapping flour types, expect to adjust. Whole wheat flour generally needs 5 to 10 percent more water for the same dough feel. Rye flour absorbs even more. Low-protein flours (cake, pastry) hold less water and behave like a much higher-hydration dough at the same numerical percentage.

When changing the recipe in your own kitchen, change one variable at a time. Adjust hydration by 2 to 3 percent per bake, observe how the dough handles, and stop when the texture matches the goal. See our methodology for our bread testing protocols.

Frequently asked questions