Sourdough Hydration Calculator
Work out your sourdough hydration from flour, water, and starter.
Quick answer: enter your details below and click Calculate Hydration — your result appears instantly, right here in your browser. Nothing you enter is uploaded or stored.
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Enter your details below.
How to use
- Enter flour and added water in grams.
- Enter starter weight and its hydration.
- Click Calculate Hydration for the whole-dough figure.
About this tool
Hydration is water as a percentage of flour, and it shapes how sticky a dough feels and how open the crumb bakes. This calculator includes the flour and water inside your starter, so the figure reflects the whole dough rather than only the added water. Higher hydration doughs are softer but harder to handle.
Frequently asked questions
Should beginners start high or low?
Low to mid, around 65 to 70 percent. The dough is easier to shape and less likely to spread.
Does starter hydration matter?
Yes. A 100 percent hydration starter is half flour and half water, and ignoring it understates the true hydration.