I started weighing my dough instead of eyeballing it after a "rustic" loaf came out more like a brick — turns out I was nowhere near the hydration the recipe actually called for. Hydration percentage is the one number that tells you more about how a dough will behave than anything else on the ingredient list, and once you're thinking in percentages instead of cups, recipes from anywhere in the world suddenly make sense.
What is bread hydration percentage?
Hydration percentage is the weight of water in a dough, expressed as a percentage of the flour weight. It's calculated as water weight divided by flour weight, multiplied by 100. Flour is always the reference point and is fixed at 100% — every other ingredient, including water, salt, yeast, and oil, is measured as a percentage relative to it. This is called baker's percentage, and it's the standard way professional and serious home bakers scale and compare recipes, regardless of batch size.
For example, a dough made with 500g of flour and 350g of water has a hydration of (350 ÷ 500) × 100 = 70%. That single number tells an experienced baker almost exactly how the dough will feel in their hands before they've even mixed it.
Hydration percentage by bread type
Different styles of bread are built around different hydration ranges. Here's roughly where common loaves land.
| Bread type | Typical hydration | Dough feel |
|---|---|---|
| Sandwich / pan bread | 60–65% | Firm, easy to shape and knead by hand |
| Classic pizza dough | 55–65% | Smooth, elastic, easy to stretch |
| Rustic artisan loaf | 68–75% | Softer, slightly tacky, holds shape |
| Sourdough (everyday) | 70–78% | Sticky, needs stretch-and-fold technique |
| Open-crumb sourdough | 78–85% | Very wet, batter-like at the extreme end |
| Ciabatta | 80–90% | Slack, pourable, shaped with wet hands |
These are starting points, not rules — flour type, protein content, and technique all shift how a given hydration behaves in practice. A strong bread flour can usually handle several percentage points more water than a soft all-purpose flour before it starts feeling unmanageable.
How to use this calculator
The three tabs above cover the situations most bakers run into:
- Hydration % — enter the flour and water weight you already have (from a recipe or your own dough) to find out what hydration you're working with.
- Water needed — enter your flour weight and a target hydration percentage to find exactly how much water to add.
- Full formula — enter flour weight, hydration, and percentages for salt, yeast, and oil to get a complete dough breakdown, including total dough weight.
The baker's percentage formula
Every ingredient in a baker's percentage formula follows the same structure: its weight divided by flour weight, times 100. Flour itself is always 100%, since it's the number every other ingredient is measured against.
| Ingredient | Formula | Typical range |
|---|---|---|
| Flour | Reference (always 100%) | — |
| Water | (Water ÷ Flour) × 100 | 55–90% |
| Salt | (Salt ÷ Flour) × 100 | 1.8–2.2% |
| Yeast (instant) | (Yeast ÷ Flour) × 100 | 0.5–2% |
| Oil / fat | (Oil ÷ Flour) × 100 | 0–8% |
To go the other direction — turning a percentage back into a weight — multiply flour weight by the percentage, expressed as a decimal. Water at 70% hydration for 500g of flour is 500 × 0.70 = 350g. The same math works for salt, yeast, and oil.
Why hydration percentage matters more than cups
Cup measurements for flour vary depending on how it's scooped, and water measured by volume ignores the fact that different flours absorb water differently. Weighing everything and working in percentages removes that guesswork entirely — a 70% hydration dough is 70% hydration whether you're making 500g of flour or 5kg. It's also what lets you scale a recipe up or down without redoing the whole thing from scratch, since every ingredient just follows the same ratio to flour.
Lower hydration
Easier to knead and shape, denser crumb, more forgiving for beginners.
Higher hydration
Stickier to handle, but produces a more open, airy crumb and a crisper crust.
Salt's role
Beyond flavor, salt tightens gluten structure and slows fermentation slightly.
Yeast's role
Controls rise speed — less yeast means a slower, often more flavorful fermentation.
Working with high hydration dough
Above roughly 75% hydration, dough gets noticeably harder to handle with traditional kneading. A few adjustments make a real difference:
- Use the stretch-and-fold technique instead of kneading — fold the dough over itself every 30 minutes during bulk fermentation rather than working it all at once.
- Keep your hands and work surface lightly wet rather than floured, since added flour changes the hydration you calculated.
- Use a bowl scraper to handle the dough instead of your hands where possible — it's far less frustrating than fighting sticky dough by hand.
- Give the dough more time. High hydration doughs often need a longer, cooler bulk fermentation to build enough structure to hold their shape.
Common hydration mistakes
A few things trip up bakers moving from cup measurements to baker's percentage for the first time:
- Forgetting that flour is always the 100% reference — every other percentage, including water, is relative to flour weight, not to the total dough weight.
- Adding extra flour during shaping to fight stickiness, which silently lowers the actual hydration below what was calculated.
- Ignoring water contributed by eggs, milk, or a starter when converting an existing recipe into percentages.
- Assuming hydration percentage alone determines difficulty — flour strength and technique matter just as much as the number itself.
Frequently asked questions
What is bread hydration percentage?
Bread hydration is the weight of water in a dough expressed as a percentage of the flour weight, calculated as water weight divided by flour weight, times 100. It's the baking industry's standard way of describing how wet or stiff a dough is.
What is a good hydration percentage for beginners?
Around 60 to 65 percent hydration is easiest to handle for beginners, since the dough stays firm enough to shape by hand without much stickiness, while still producing a decent open crumb.
What hydration is sourdough bread?
Most sourdough loaves fall between 70 and 80 percent hydration. Rustic, open-crumb sourdough often sits at 75 to 85 percent, while sandwich-style sourdough tends to stay closer to 65 to 70 percent.
How do you calculate hydration for bread dough?
Divide the total water weight by the total flour weight, then multiply by 100. For example, 350 grams of water with 500 grams of flour gives 350 ÷ 500 × 100, which equals 70 percent hydration.
Does hydration percentage include water from other ingredients?
A precise baker's percentage counts all liquid in the dough, including water from eggs, milk, or a sourdough starter, not just water added directly. For most home recipes, using the water added plus the water portion of a starter is close enough.
Why is my high hydration dough so sticky?
Above roughly 75 percent hydration, gluten development takes longer and the dough naturally feels tackier. Wet hands, a bowl scraper, and stretch-and-fold techniques instead of traditional kneading make high hydration dough much easier to manage.
What percentage salt should I use in bread dough?
Most bread formulas use 1.8 to 2.2 percent salt relative to flour weight. Around 2 percent is the standard baker's default, balancing flavor with its effect on fermentation speed.
How much yeast do I need per baker's percentage?
Instant yeast typically ranges from 0.5 to 2 percent of flour weight depending on how fast you want the dough to rise; 1 percent is a common everyday default for a same-day loaf.
Can I use this calculator for pizza dough too?
Yes, the hydration math is identical, though pizza dough usually runs lower, from about 55 to 65 percent for a classic crust. For pizza-specific presets and oil percentage, the dedicated pizza dough calculator on CookConvert is built for that.
Why do European and American recipes list hydration differently?
It's mostly a units issue, not a formula issue. European recipes are usually already written by weight, so hydration is easy to read directly, while American recipes often use cups, which have to be converted to grams first before hydration means anything.