Question 1

What does the Leavening Calculator calculate?

Accepted Answer

In Commercial yeast mode it estimates baker’s-% Instant Dry, Active Dry, or Fresh yeast from your fermentation schedule. In Sourdough starter mode it estimates the ripe starter/levain as a baker’s percentage of total formula flour.

Question 2

Is starter percentage the same as seed starter in a levain build?

Accepted Answer

No. The sourdough result is whole ripe starter or levain mass relative to total formula flour in the final dough. It is not the separate “% starter in levain” seed/feed ratio used when refreshing a preferment.

Question 3

How do multi-stage schedules affect starter percentage?

Accepted Answer

Each stage contributes population doublings based on its temperature and duration. Total doublings sum across stages, then invert to starter percentage. Stage order does not change the numeric result; use intermediate stages if you need to model gradual temperature changes.

Question 4

What are the limitations of the sourdough model?

Accepted Answer

The TXCraig1 starter model was fitted primarily around 75°F data with checks near 65–70°F. Starter strength, culture composition, flour, hydration, salt, dough mass, and actual dough temperature all require empirical adjustment. Results above ~40% or below ~1% starter deserve extra caution.

Question 5

When should I use the Leavening Calculator vs Yeast Conversion?

Accepted Answer

Use the Leavening Calculator to size commercial yeast or sourdough starter from fermentation time and temperature. Use the Yeast Conversion Calculator when you already have a commercial yeast amount and need to swap Instant Dry, Active Dry, or Fresh (or convert grams ↔ teaspoons). Conversion is a separate substitution tool and does not size leavening from a schedule.