Free calculators
The sourdough toolkit.
Five focused tools for building sourdough formulas, checking hydration, feeding starter, planning bulk fermentation, and working backwards from bake time.
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Sourdough Hydration
Calculate true hydration including starter.
g
Sourdough Formula
Build a complete sourdough formula from baker’s percentages.
1:2
Starter Calculator
Build exactly the starter amount you need.
°
Bulk Fermentation
Choose a recipe and room temperature; we fill in the technical settings.
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Bake Planner
Choose a recipe, bake time and sleep window for a realistic schedule.
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How the Numbers Work
Learn sourdough hydration, percentages, fermentation and starter fundamentals.