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Sourdough Calculator

Sourdough starter ratios and fermentation times

🍞Sourdough Recipe Calculator

e.g. 75 for 75%

e.g. 20

e.g. 2

Sourdough baking uses baker's percentages where all ingredient quantities are expressed as a percentage of total flour weight. This allows recipes to scale easily to any batch size. The starter (levain) contributes its own flour and water to the dough.

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Tip: Warmer ambient temperatures (24–28°C) ferment faster. Cool your dough in the fridge overnight for better flavour development — this is cold retarding.

  1. 1Set total flour as 100% — all other ingredients are percentages of this
  2. 2Hydration % = Water weight ÷ Flour weight × 100
  3. 3Starter % = Starter weight ÷ Flour weight × 100
  4. 4A 100% hydration starter contains equal weights of flour and water
  5. 5Adjust the main water to account for water already in the starter
500g flour, 75% hydration, 20% starter=375g water total, 100g starterMain water = 375 − 50 = 325g (50g from starter)
1000g flour, 80% hydration, 15% starter=800g water, 150g starterStarter provides 75g flour + 75g water
StyleHydrationStarter %Salt %
Country loaf72–75%15–20%2%
High hydration80–85%20%2%
Sandwich loaf65–70%20%2%
Baguette70–75%25%2%
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