Poolish Calculator

Poolish is a liquid pre-ferment made from equal parts flour and water by weight (100% hydration), with a very small amount of yeast. Originating in Poland and later perfected by French bakers, poolish is the secret behind many classic European breads, including baguettes, pain de mie, and ciabatta. By allowing a portion of the total recipe flour to undergo a long, slow fermentation before mixing the final dough, poolish develops complex flavors, improves crumb structure, and extends the shelf life of the finished bread.

The high hydration of poolish creates a thin, batter-like consistency that allows yeast and wild bacteria to move freely, producing a wide array of organic acids and aromatic compounds. These flavor molecules give bread a deeper, more nuanced taste compared to a straight-dough method. Poolish also helps the dough retain moisture, resulting in a softer crumb with irregular holes — the hallmark of artisan bread.

Unlike its stiff counterpart, biga, poolish is typically fermented for 8-16 hours at room temperature. The fermentation time and the amount of yeast used are inversely related: a longer fermentation requires less yeast, which in turn produces more flavor. This calculator helps you determine the exact quantities of flour, water, and yeast needed for your poolish based on your recipe size, desired fermentation window, and room temperature.

The poolish calculator uses the following relationships to determine ingredient amounts. The total flour in the poolish is a percentage of the recipe's total flour, and because poolish is always 100% hydration, the water weight equals the flour weight. Yeast amount is determined by fermentation time and adjusted for room temperature.

Use this calculator to precisely measure your poolish ingredients:

1. Enter Total Recipe Flour: Input the total flour weight in grams for your complete bread recipe. For a standard loaf, this is typically 400-500g.
2. Set Flour in Poolish: Use the slider to choose how much of the total flour goes into the poolish. A typical range is 30-50%, with 40% being a good starting point for most recipes.
3. Adjust Fermentation Time: Set how long you want the poolish to ferment. Shorter times (3-6 hours) need more yeast; longer times (12-24 hours) need almost none, producing deeper flavor.
4. Set Room Temperature: Enter your kitchen temperature in Fahrenheit. Warmer rooms accelerate fermentation, so the calculator reduces yeast accordingly.
5. View Results: The calculator displays the exact grams of flour, water, and yeast for your poolish, plus the remaining flour needed for the main dough.

The calculator outputs several key values that guide your bread-making process. The Total Poolish weight is the combined mass of flour and water in the preferment. The Poolish Recipe section breaks down exact grams for flour, water, and instant yeast. The Remaining Flour tells you how much flour to add during the final dough mix.

The Readiness Sign gives you a visual cue for when your poolish is ready to use. After 3-6 hours, it will be bubbly but not domed. Between 6-10 hours, it will dome and begin to recede — this is the ideal stage for most recipes. Beyond 10 hours, the poolish flattens and shows many surface bubbles, indicating peak fermentation has passed.

Poolish is just one type of pre-ferment, and understanding how it compares to others helps you choose the right technique for your bread. The three most common pre-ferments are poolish, biga, and pâte fermentée, each with distinct characteristics.

Poolish is a liquid pre-ferment at 100% hydration. It produces bread with an open, irregular crumb and a mildly tangy flavor. It is the preferred pre-ferment for French breads like baguettes and pain de mie. Biga is a stiff pre-ferment at 45-60% hydration, producing a denser dough that develops slowly, yielding complex, nutty flavors ideal for Italian breads like ciabatta and focaccia. Pâte fermentée is essentially a piece of yesterday's dough reserved and fermented overnight, adding both flavor and structure to the new batch.

The key advantage of poolish is its ease of mixing — since it is a batter, it requires no kneading and incorporates effortlessly into the final dough. Its high hydration also contributes to a more extensible dough, which is beneficial for achieving the elongated shape and open crumb of traditional French breads.

Poolish is indispensable in professional boulangeries around the world. In a French bakery, a poolish mixed in the evening ferments overnight and is ready for use by morning, allowing bakers to produce consistent, flavorful bread with minimal active labor. The long fermentation also staggers the production schedule, enabling bakeries to manage oven time efficiently throughout the day.

Home bakers benefit equally from poolish. By mixing a poolish before bed and baking in the morning, you can enjoy freshly baked artisan bread with minimal effort. The pre-ferment develops flavor during hours when you are asleep, and the improved dough handling properties make shaping easier. Poolish is also forgiving — if it over-ferments slightly, the bread may be a touch more sour but will still bake up beautifully.

Beyond bread, poolish can be used in pizza dough, flatbreads, and even enriched doughs like brioche. Any recipe that calls for flour and yeast can benefit from converting a portion of the flour into a poolish, provided you account for the added water in the preferment when calculating the final dough hydration.