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Fermentation Time Calculator

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Pro Tip

Use the float test for sourdough readiness: a teaspoon of starter floats in water when it is ripe with gas and ready to bake with.

Difficulty:Beginner

Did you know?

The oldest confirmed sourdough starter still in use dates to 1847 - maintained by the same family in Montana, USA, with documented lineage across 5 generations.

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Reviewed May 2026
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