Fermentation Time
Adjust dough fermentation time for a different ambient temperature.
About Fermentation Time
Microbial activity roughly doubles for about every ten degree rise, so cooler rooms stretch ferment time and warmer ones shrink it. Ambient temperature swings of even a few degrees shift ferment timing noticeably, which is why bakers track it.
Formula
Fermentation Time
Adjusted = base time x 2^((base temp - actual temp) / 10)
- factor
- For roughly a doubling of rate per 10 C rise
Worked example
With the default values below, Fermentation Time returns Adjusted Time of 31.67. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Base timeminimum 0.1 h
- 24 h
- Base temperatureminimum -10 C
- 25 C
- Actual temperatureminimum -10 C
- 21 C
Results
- Adjusted Time
- 31.67 h
- Adjusted Time
- 1,900 min
- Temperature Difference
- 4.0 C
Step by step
- 1Values used
- 2Fermentation Time
- 3Adjusted Time= 31.67 h
- 4Adjusted Time= 1,900 min
- 5Temperature Difference= 4.0 C
Assumptions and limits
- The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
- Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
Frequently Asked Questions
How is Fermentation Time calculated?
Adjusted = base time x 2^((base temp - actual temp) / 10) Microbial activity roughly doubles for about every ten degree rise, so cooler rooms stretch ferment time and warmer ones shrink it.
Why does Fermentation Time matter?
Ambient temperature swings of even a few degrees shift ferment timing noticeably, which is why bakers track it.
What values do I need to enter?
This calculator takes 3 inputs: Base time, Base temperature, Actual temperature. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.