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Sourdough Starter Feed Ratio Calculator

Starter : flour : water at 1:N:N for a feed.

Compute the grams of flour and water to add to a sourdough starter at a chosen feed ratio (e.g. 1:5:5), which dictates how active the starter will be — higher ratios slow it down, lower ratios make it quicker but more sour.

Marcus Laurent By Marcus Laurent
Published Last reviewed 1 min read

Inputs

g

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

Flour = starter · ratio_n. Water = starter · ratio_n. Total mass = starter · (1 + 2·ratio_n).

In depth

Compute the grams of flour and water to add to a sourdough starter at a chosen feed ratio (e.g. 1:5:5), which dictates how active the starter will be — higher ratios slow it down, lower ratios make it quicker but more sour.