Sourdough Hydration Calculator

How to use this sourdough hydration calculator

This sourdough hydration calculator turns two practical choices into a usable bread formula: how much dough you want to make, and how wet you want that dough to be. Type in the total dough weight in grams, move the hydration slider between 50% and 100%, and the calculator shows the flour weight and water weight needed to reach that hydration.

The result treats the dough as flour plus water, which is the cleanest way to understand hydration before salt, sourdough starter, oil, seeds, grains, or other ingredients enter the picture. Once you know the base flour and water split, you can build a full dough formula around it.

What sourdough hydration means

Hydration is a baker's percentage. Instead of describing water as a percentage of the whole dough, bread bakers describe water as a percentage of flour weight. Flour is always 100%. If a dough has 500 grams of flour and 350 grams of water, the hydration is 70%, because 350 is 70% of 500.

This system is useful because flour is the anchor of a bread formula. Salt might be 2%, starter might be 15-25%, and water might be 65-85%, but all of those numbers refer back to flour. Once you learn to read baker's percentages, recipes become much easier to scale.

The formula behind the calculator

The calculator uses a direct flour-plus-water formula. Hydration is water divided by flour, multiplied by 100. When you already know the total dough weight, the flour is the total weight divided by one plus the hydration expressed as a decimal. Water is the remaining weight.

The ratio bar on the calculator makes that relationship visible: at lower hydration, flour takes up more of the total bar; at higher hydration, the water section grows.

Choosing the right hydration level

There is no single best hydration for every sourdough loaf. The right number depends on your flour, temperature, shaping confidence, fermentation schedule, and the style of bread you want. Lower hydration doughs are stronger, easier to handle, and more predictable.

For a first sourdough loaf, 65-70% hydration is a friendly range. Around 72-78% is a common artisan sourdough zone, especially with bread flour. Above 80%, you are in high hydration territory: great for open crumb, focaccia, and ciabatta, but much less forgiving during shaping.

How flour changes hydration

Flour absorption matters as much as the percentage itself. Strong bread flour can usually take more water than soft all-purpose flour. Whole wheat, spelt, and rye bring bran, germ, and different starch behavior into the dough, so they often need either more water or a longer rest.

Hold back 20-30 grams of water if you are unsure. Mix the dough, judge the feel after a short rest, and add the reserved water only if the flour can take it.

What hydration does to dough handling

Hydration changes the feel of dough from the first mix to the final score. At lower hydration, dough resists stretching and can be kneaded or shaped with dry hands. At moderate hydration, the dough becomes extensible and benefits from stretch and folds or coil folds.

If a dough feels unworkable, the answer is not always less water. Sometimes it needs more gluten development, more rest, or less fermentation. Use the hydration calculator to choose the formula, then use dough feel, rise, bubbles, and timing to guide the fermentation.

Common hydration ranges

These ranges are guides, not rules. A pan loaf can be high hydration because the pan supports it. A free standing boule needs enough strength to hold itself upright. Your best hydration is the one that gives the texture you want and a dough you can handle calmly.