Find the water percentage of your bread dough, or solve for the water a target hydration needs.
Water, flour, and one percentage
Bread recipes often say a dough is 70 percent hydration, and beginners wonder what that means. It is not the share of water in the finished dough. It is the weight of water divided by the weight of flour, multiplied by 100. Flour is always the reference at 100 percent, and every other ingredient is measured against it. This system, called baker percentages, lets bakers scale recipes up or down without breaking the dough.
This calculator does two jobs. Enter your flour and water weights to find the hydration of a dough you already made, or enter your flour weight and a target hydration to find how much water that target needs. Both directions use the same simple division, and both are useful: the first explains a dough that behaved strangely, and the second designs a dough that behaves as you want.
Why hydration changes everything
Low hydration dough, around 55 to 65 percent, is firm, easy to knead, and easy to shape. It suits sandwich loaves, rolls, and enriched doughs that already contain butter, milk, or eggs. High hydration dough, above 75 percent, is soft, sticky, and hard to handle, but it can give an open crumb with large holes, which is what many artisan loaves aim for.
Between those extremes sits the most forgiving range, roughly 65 to 75 percent, where most home bread lives. The right hydration also depends on the flour: strong bread flour absorbs more water than plain flour, and wholemeal flour absorbs more than white flour. A recipe written for one flour may need adjusting for another, and the calculator shows you exactly how much to change.
A worked example
Take 500 grams of flour and 350 grams of water. Dividing 350 by 500 gives 0.7, and multiplying by 100 gives 70 percent hydration. That is a soft but manageable dough for most bread flours. If the same flour felt dry last time, try 375 grams of water, which gives 75 percent, and note how the dough feels during mixing.
Now work backwards. Suppose you want 500 grams of flour at 68 percent hydration. Multiply 500 by 0.68 to get 340 grams of water. That is the target solver in action: it turns a percentage you read in a book into grams you can weigh on a scale, which is far more reliable than measuring water in cups.
Weigh, do not scoop
The calculator uses grams because volume measures mislead. A cup of flour can weigh anywhere from 120 to 160 grams depending on how it was scooped and packed, which is a difference of up to 30 percent in hydration. Water is more consistent, since a millilitre of water weighs one gram, but flour is not. Weigh both ingredients, every time, and your results become repeatable.
Temperature matters too. Cold water slows fermentation, warm water speeds it, and the dough temperature after mixing shapes the whole rise. The calculator does not cover temperature, but a simple habit helps: use water near room temperature for a normal rise, and keep notes on what worked, so a good loaf can be repeated.
Fixing a dough that feels wrong
If a dough feels stiff and tears when stretched, it is probably under-hydrated for its flour. Add water a tablespoon at a time during mixing, letting each addition absorb before adding more, and weigh the total so you know the new hydration. If a dough sticks to everything and will not hold shape, it may be over-hydrated, or it may simply need more kneading and folding to build strength.
Do not confuse stickiness with failure. High hydration dough feels messy at first and firms up as gluten develops through kneading and folding. Give it time and a few folds before adding flour, because extra flour changes the hydration you aimed for. If the dough still will not hold shape after folding, a lower hydration next time is the honest fix.
Frequently asked questions
Does hydration include water from other ingredients? In strict baker percentages, only the water you add counts, but milk, eggs, and a wet starter also add liquid. If your recipe includes them, count their water roughly or expect the dough to feel wetter than the calculator suggests.
What hydration should a beginner start with? Start near 65 percent with strong bread flour. It is forgiving, easy to shape, and still gives a good loaf. Move up by 2 or 3 percent at a time as your handling improves.
Can I use this calculator for pizza dough? Yes. Most pizza doughs sit between 60 and 70 percent, with Neapolitan styles often near 65 percent. Use the same method: weigh flour and water, and adjust from there.