Enter flour weight and hydration to get gram-precise water, starter and salt — plus the true total hydration most calculators miss.
Open calculatorTemperature-aware timing: estimate your bulk fermentation time and target rise from dough temperature and starter amount.
Open calculatorFind the water for any hydration %, or work the hydration % back from your flour and water — with true total hydration.
Open calculatorLearn the baking behind the numbers
Guides on baker's percentage, hydration and fermentation — the why behind every calculator.
Bake with the full toolkit
The Sourdough Companion app does the baker's math for you, tracks fermentation live, and saves every formula so you can scale, tweak and bake it again.
Try the app — free