Sourdough starter calculators
A starter is only flour and water in a known ratio. Once you split it into those two parts you can change its hydration, bake with discard, or swap it for yeast without changing the dough.
Calculators in this section
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Sourdough starter hydration converter
Enter your starter's weight, its current hydration and the hydration you want. You see how much flour or water to add, step by step.
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Sourdough discard recipe converter
Enter the flour and liquid of any recipe and the discard you want to use. You see how much flour and liquid to leave out so the dough stays the same.
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Yeast to sourdough converter
Enter your yeast recipe and your starter. You see how much starter to use under several published rules of thumb, and how much flour and liquid to take out so the dough keeps its hydration.
Which calculator do I need?
Is your starter wetter or stiffer than the recipe asks for? Use the starter hydration converter.
Do you want to use up discard in a recipe that was written without it? Use the discard recipe converter.
Is the recipe written for dry or fresh yeast and you want to raise it with starter? Use the yeast to sourdough converter.