The Bread Hydration Calculator is contained in the free Bread Baker's Toolbox. A collection of baking calculators designed for artisan bread bakers. Quickly calculate dough hydration, baker's percentages, recipe scaling, dough weight, preferment ratios, yeast conversions, and pan size adjustments. Whether you're baking a single loaf or scaling a commercial recipe, these tools help ensure accurate and consistent results.
What is dough hydration?
Dough hydration is a baker’s percentage that compares the weight of liquid in a recipe to the weight of flour. To calculate it, divide the total weight of water (and other water-based liquids) by the total weight of flour, then multiply by 100.
Hydration has a major influence on the texture and handling characteristics of dough:
- 50–57% Hydration: Produces a firm, relatively dry dough that creates a tight, dense crumb. This range is common for foods such as bagels and pretzels.
- 58–65% Hydration: Results in a dough that is soft and slightly tacky while remaining easy to handle. Many sandwich breads, dinner rolls, and traditional pizza doughs fall within this range.
- 65–80%+ Hydration: Creates a wetter, stickier dough that can develop a light, open crumb with large air pockets. Ciabatta, focaccia, and some artisan-style pizzas are typical examples.
As hydration increases, dough generally becomes more extensible, elastic, and difficult to shape. Higher water content also promotes fermentation activity, often leading to better oven spring and a softer, more open texture. The ideal hydration level depends on several factors, including the type of flour used, environmental humidity, and even altitude, all of which affect how much water the flour can absorb.
What Is Baker’s Math?
Baker’s math is a simple system that professional and home bakers use to express recipes as percentages. Instead of listing ingredients only by weight, each ingredient is calculated as a percentage of the total flour weight, which is always considered 100%.
This approach makes it easy to resize recipes, compare different dough formulas, and understand how ingredient ratios affect the final bread. For example, if a recipe contains 500 grams of flour and 350 grams of water, the water percentage is 70%, meaning the dough has 70% hydration.
Because every ingredient is measured against the flour weight, the total of all percentages in a recipe will usually be greater than 100%.
Why Scale a Recipe?
Recipe scaling allows bakers to increase or decrease batch sizes while maintaining the original ingredient ratios. Whether you’re baking for a crowd or making a smaller test batch, proper scaling helps ensure consistent results.
Scaling Up Recipes
When increasing a recipe, ingredient amounts can usually be multiplied by the desired factor. However, larger batches often require larger pans or multiple baking vessels to maintain the same batter or dough depth. If the depth changes significantly, baking times and temperatures may need adjustment.
For example, a deeper batter may require a slightly lower oven temperature and a longer bake time so the center cooks completely before the edges become overdone. Ingredients such as spices and leavening agents may also need careful adjustment, as they do not always scale perfectly in large batches.
Scaling Down Recipes
Reducing a recipe can be useful when baking smaller loaves, testing new formulas, or using mini loaf pans. Accurate scaling is best done by weight rather than volume, since measuring by weight provides greater precision for ingredients such as flour, yeast, salt, and baking powder.
Yeast-based doughs can sometimes behave differently in very small batches because fermentation and temperature changes have a greater impact. For the most consistent results, avoid reducing recipes to extremely small quantities unless the formula was specifically designed for that size.
The Importance of Pan Size
Pan dimensions affect baking performance just as much as ingredient quantities. A larger pan spreads the dough or batter over a greater area, creating a shallower layer that typically bakes faster. A smaller pan creates a deeper layer, which often requires additional baking time.
When substituting pan sizes, consider both the volume and surface area of the new pan. Significant changes in depth may require adjustments to baking time and, in some cases, a slight reduction in oven temperature to promote even baking and proper texture.
Common Types of Preferments
Preferments are mixtures of flour, water, and yeast that are fermented before being incorporated into the final dough. They help improve flavor, aroma, texture, and dough handling characteristics. Three of the most common preferments are poolish, biga, and sponge.
Poolish
Poolish is a wet preferment made with equal weights of flour and water, giving it 100% hydration. Originally associated with Polish baking methods, poolish is popular in artisan breads because it develops a mild, complex flavor while improving dough extensibility. Its loose consistency encourages active fermentation, making it a good choice for overnight or same-day bread recipes. See our Poolish Calculator!
Biga
Biga is a traditional Italian preferment made with much less water than a poolish, typically around 50–60% hydration. The firmer consistency helps strengthen gluten development and contributes a deeper, slightly tangy flavor. Biga is commonly used in rustic Italian breads and other artisan loaves where a strong dough structure and chewy texture are desired.
Sponge
A sponge is a flexible preferment that can range from moderately stiff to fairly wet, usually between 50% and 80% hydration. It often contains most or all of the yeast called for in the recipe and is fermented for a relatively short period before the remaining ingredients are added. Sponges are frequently used in enriched breads, sandwich loaves, and sweet doughs because they enhance flavor and dough strength without producing excessive acidity.
Choosing the Right Preferment
Each preferment offers different benefits. Poolish is often selected for open crumb structures and mild flavor, biga for strength and complexity, and sponge for speed and versatility. The best choice depends on the style of bread being made and the characteristics the baker wants to achieve.
For more discussion on preferments see: https://www.bonappetit.com/story/what-is-a-preferment
FAQ’s
What is bread hydration?
Bread hydration is the percentage of water compared to flour weight. A dough made with 500 grams of flour and 350 grams of water has a hydration of 70%.
What are baker’s percentages?
Baker’s percentages express every ingredient as a percentage of the flour weight, which is always considered 100%.
How do I scale a bread recipe?
Multiply all ingredients by the same scaling factor. The Recipe Scaling Calculator above performs this automatically.
What percentage of flour should be prefermented?
Most bread formulas use between 20% and 40% prefermented flour depending on fermentation time and flavor goals.