Bread Hydration Calculator

About This Tool

The Bread Hydration Calculator helps bakers determine the hydration percentage of their bread dough using baker's math. Hydration is the single most important variable in bread baking because it controls the dough's texture, workability, crumb structure, and crust character. Understanding and controlling hydration separates novice bakers from skilled ones, and this tool makes it simple to calculate and interpret your dough's hydration level.

What Is Baker's Percentage?

Baker's percentage (also called baker's math) is a system where every ingredient is expressed as a percentage of the total flour weight. Flour is always 100%. If a recipe calls for 500g of flour and 350g of water, the water is 70% (350 divided by 500, times 100). This system makes it easy to scale recipes and compare formulas regardless of batch size. Hydration percentage specifically refers to the ratio of total liquid to total flour weight.

How Hydration Affects Your Bread

Low hydration doughs (50-60%) produce dense, tight-crumbed breads with a chewy texture. Bagels at around 55% hydration are a classic example. The dough is stiff and easy to shape but requires significant kneading. Standard hydration (60-65%) is the sweet spot for sandwich loaves and dinner rolls. The dough is manageable, shapes well, and produces a soft, even crumb with thin crust. Moderate hydration (65-70%) works well for French bread and lean hearth loaves. The dough is slightly sticky but still shapeable. High hydration (70-75%) is the territory of artisan sourdough and country loaves. These doughs are wet and sticky, requiring stretch-and-fold techniques rather than traditional kneading. The reward is an open, irregular crumb with large holes and a crispy crust. Very high and extreme hydration (75-100%) produces ciabatta, focaccia, and pizza doughs with extremely open crumbs and a light, airy interior.

Multiple Flours and Liquids

Many bread recipes use more than one type of flour. A sourdough might combine bread flour, whole wheat, and rye. This calculator lets you add multiple flour entries and sums them for the total flour weight. Similarly, liquids are not always just water. Milk, olive oil, honey, and eggs all contribute moisture. Add each liquid ingredient separately to get an accurate total. Note that for baker's math purists, fats like oil and butter are sometimes calculated separately, but for hydration purposes, including all liquids gives you a practical working number.

Sourdough Starter Hydration

If you use a sourdough starter, its hydration affects the overall dough hydration. A 100% hydration starter (equal parts flour and water by weight) contributes both flour and liquid to your dough. For example, 200g of 100% hydration starter adds 100g flour and 100g water. To be precise, split your starter into its flour and liquid components when entering values. A 75% hydration starter with 200g total contains approximately 114g flour and 86g water.

Tips for Working with High Hydration Dough

Wet doughs can be intimidating for new bakers. Use a bench scraper instead of your hands for handling. Wet your hands with water rather than adding flour, which changes the hydration. Perform stretch-and-fold sets every 30 minutes during bulk fermentation instead of traditional kneading. Use a well-floured banneton or proofing basket for the final shape. Bake in a preheated Dutch oven to trap steam and develop a crackling crust. With practice, high hydration doughs become intuitive and rewarding.