Sourdough Levain Calculator
Calculate the flour, water, and seed starter needed to build a levain for your sourdough recipe. Specify prefermented flour percentage and starter hydration.
Inputs
Results
Total levain needed
400 g
How to Use This Calculator
- Enter the total recipe flour weight in grams.
- Set the prefermented flour percentage (15–30% is typical).
- Enter levain hydration and the seed starter percentage used to build it.
- The calculator shows total levain needed, flour and water in the levain, seed starter amount, and estimated build time at 75 °F.
- Mix the levain build and use it when it has peaked (domed top, doubled in size) at the indicated time.
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