About the Yeast Calculator

Use cases

This calculator is designed for bakers who:

• Want to fit baking into a busy schedule by calculating how much yeast fits a chosen timeframe.
• Need to adapt a recipe for a different kitchen temperature.
• Are converting between Instant, Active Dry, or Fresh (cake) yeast.
• Want to combine warm bulk fermentation with a long cold retard in separate stages.

How it works

This calculator uses the TXCraig1 fermentation model (calibrated to real-world dough data) to predict baker's-% yeast from your schedule. In plain terms: yeast works faster when it is warmer — in this app, rate about doubles for every 14°F change versus a reference temperature (a common rule-of-thumb band in baking forums is similar).

The biological idea

Yeast is a living organism, and its metabolic rate depends strongly on temperature. That relationship is often summarized with a rule of thumb related to the Arrhenius equation: within a practical kitchen range, doubling time shifts noticeably as the dough warms or cools.

What the formula is doing

We look up (or infer) the yeast percentage that matches your total "effective" fermentation time at a reference temperature, then scale for the yeast type you selected.

The implementation uses the project's table calibration and a ~14°F doubling step for rate multipliers; see the source for exact constants.

Multi-stage schedules on the calculator

On the tool, each stage is one temperature held for a number of hours, in chronological order. Example: row 1 = warm bulk on the counter, row 2 = overnight in the fridge. The app converts each segment into equivalent time at the reference temperature and adds them before looking up yeast. Use the example chips on the calculator to load common patterns, then edit the numbers to match your kitchen.

Yeast types

The calculator applies standard conversion factors relative to Instant Dry Yeast (IDY):