BakersMath · Sourdough
Sourdough Tools & Calculators
Everything you need to bake better sourdough. Sourdough bakers are precision-obsessed by nature. These tools meet that standard. No recipes, no life stories. Just the numbers.
Sourdough Hydration Calculator
Enter flour weight, target hydration, starter percentage, and salt. Get a precise gram-by-gram breakdown using real baker's math. Accounts for flour and water inside the starter.
Starter Feeding Scheduler
Tell us when you want your starter at peak and your kitchen temperature. The calculator works backwards and tells you exactly when to feed. Adjusts for ratio and temperature.
Yeast-to-Sourdough Converter
Have a yeast recipe you want to convert to sourdough? Enter the yeast amount and total flour. Get the starter quantity, adjusted flour and water, and fermentation timing guidance.
Starter From Scratch Calculator
Day-by-day feeding plan for building a new starter from nothing. Enter your start date and kitchen temperature. Get a personalised schedule with what to expect at each stage.
Why sourdough math is different
Sourdough introduces a variable that commercial-yeast baking doesn't have: your starter is itself a mixture of flour and water. A proper hydration calculation has to account for the flour and water inside the starter, not just what you weigh out separately. Most online tools get this wrong, which is why bakers who follow a 75% hydration recipe end up with dough that's a few percent off.
Fermentation timing adds another layer: the same 1:2:2 ratio starter peaks in 6 hours at 24°C and nearly 10 hours at 20°C. Temperature isn't a footnote. It's a core input. Every tool in this category treats it as one.
What calculator do you need next?
Drop your email and tell us what's missing. We build based on what bakers actually ask for.