Dough Hydration Ratio

Dough hydration ratio is the amount of water in a dough expressed as a percentage of the flour weight. It is calculated using baker’s percentage: the flour is treated as 100%, and the water weight is compared with it. Hydration influences dough consistency, handling, fermentation and the structure of the finished bread.

Dough hydration formula

Hydration (%) = (water weight ÷ flour weight) × 100

For example, a dough made with 500 g flour and 350 g water has 70% hydration: (350 ÷ 500) × 100 = 70%.

How hydration affects dough

• Lower hydration: generally produces a firmer, less sticky dough that is easier to shape into tight forms, such as many bagels.
• Moderate hydration: common in many sandwich breads, baguettes and lean doughs; the dough can be handled and shaped while retaining useful extensibility.
• Higher hydration: produces a softer, wetter dough that may support an open crumb but usually requires careful mixing, folding and shaping.

Hydration ranges vary widely with flour type, protein quality, milling, recipe and technique. A strong bread flour may absorb more water than a weaker flour, and whole-grain flours often require additional water because of their bran and fibre content.

Hydration in baker’s percentage

Flour is the reference ingredient at 100%. Water is expressed as a percentage of that flour weight. Other ingredients—such as salt, yeast, sugar, fat and inclusions—are also commonly expressed as percentages of flour weight. In enriched doughs, some bakers calculate total hydration using the water contained in milk or eggs, while others report added water separately; state the method when comparing formulas.

Common hydration mistakes

Comparing hydration percentages without considering flour strength can be misleading. A dough that feels too wet may need more development or a rest rather than extra flour. Adding flour during shaping changes the formula and can make the finished bread denser.

Chef’s tip: Weigh ingredients rather than measuring water by volume. Record the flour brand, flour type and mixing method with the hydration percentage so the formula can be reproduced accurately.

Key distinction: Hydration ratio is the percentage of water relative to flour weight; it is not the percentage of water in the finished dough by total weight.