MTMasterTool

Sourdough Starter Calculator

Calculate sourdough starter for your recipe.

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What this tool does

Calculate sourdough starter for your recipe. Feeding ratio by mass; starter hydration and fermentation readiness depend on the existing starter and conditions.

How to use the Sourdough Starter Calculator

  1. Enter or select seed starter mass (grams).
  2. Enter or select feeding flour parts per starter part.
  3. Enter or select feeding water parts per starter part.
  4. Read the calculated result; change any measurement to compare alternatives.

Formula

added flour=seed×flour ratio; added water=seed×water ratio; total=seed+added flour+added water
seed
Seed starter mass (grams)
flourRatio
Feeding flour parts per starter part
waterRatio
Feeding water parts per starter part

Feeding ratio by mass; starter hydration and fermentation readiness depend on the existing starter and conditions.

Worked example

For sourdough starter calculator, the following measurements illustrate the exact method: Seed starter mass (grams): 20; Feeding flour parts per starter part: 2; Feeding water parts per starter part: 2.

Inputs

  • Seed starter mass (grams)20
  • Feeding flour parts per starter part2
  • Feeding water parts per starter part2

Result

  • Total fed starter (grams)100
  • Add flour (grams)40
  • Add water (grams)40

Results explained

Total fed starter (grams)
Total fed starter (grams) from the formula above. Feeding ratio by mass; starter hydration and fermentation readiness depend on the existing starter and conditions.
Add flour (grams)
Add flour (grams) from the formula above. Feeding ratio by mass; starter hydration and fermentation readiness depend on the existing starter and conditions.
Add water (grams)
Add water (grams) from the formula above. Feeding ratio by mass; starter hydration and fermentation readiness depend on the existing starter and conditions.

Frequently asked questions

added flour=seed×flour ratio; added water=seed×water ratio; total=seed+added flour+added water

Feeding ratio by mass; starter hydration and fermentation readiness depend on the existing starter and conditions.

No. Cooking time is a planning estimate only. Verify internal temperature with a thermometer and follow official food-safety instructions.

Weigh ingredients when possible, use the correct measuring-cup standard, and check recipe and equipment specifications.

No. Every input and calculation stays in your browser.