Sourdough Levain & Preferment Calculator

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All the flour in the loaf g

Overall hydration %

Salt %

Preferment, as % of the flour weight %

Preferment's hydration %

Extra to keep back g

Feed ratio 1 : n : n — n is

Enter the overall formula and the preferment, then press Calculate.

From the book — Chapter 5. Flour in a preferment = its weight ÷ (1 + its hydration). The rest is water. A feed of 1 : 2 : 2 is starter : flour : water.

For a poolish or biga, use the same boxes: its share of the flour, and its hydration. Everything stays in your browser — no sign-up, nothing stored.