Online Tool Store
Fermentation Timer
Estimate fermentation time for dough, kraut, or kombucha at your ambient temperature, and track elapsed time against the expected window.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
Date & Time
Fermentation Timer
Frontend preview — no upload or external service.
Estimated window
A 4-hour bulk ferment at 24 °C becomes roughly 5 hours 20 minutes at 22 °C, and about 3 hours at 27 °C — check the dough, not the clock.
How the Fermentation Timer works
- Choose the type of ferment and enter your actual ambient temperature, measured near the vessel rather than across the room.
- Enter a reference time from your recipe with the temperature it assumed.
- Use the adjusted window as a guide and judge readiness by the physical signs the recipe describes.
The method
Fermentation rate roughly doubles for every eight to ten degrees Celsius, so a recipe's timing is only valid at the temperature it was written for.
adjusted time ≈ reference time x 2^((reference temp - actual temp) / 9)
A 4-hour ferment at 24 °C stretches to about 5 hours 20 at 22 °C, and shortens to roughly 3 hours at 27 °C.
FAQ
Why does my dough never match the recipe timing?
Because most recipes assume a kitchen around 22 to 24 °C and do not say so. A cold kitchen can double the time, and a warm one halves it.
Should I go by time or by look?
By look, always. Time is a planning estimate; the dough's rise, the smell of a kraut, or the taste of a kombucha are the actual signals.
Does a longer, cooler ferment taste different?
Yes. Slower fermentation develops more acid and flavour complexity relative to gas production, which is the whole reason for retarding dough in the fridge.
How we compare
| Feature | Online Tool Store | A calendar app | Mental arithmetic |
|---|---|---|---|
| Temperature-adjusted timing | ✓ | ✗ | Sometimes |
| Covers several ferment types | ✓ | ✓ | ✓ |
| No account | ✓ | ✓ | ✗ |
| Replaces judging by eye | ✗ | ✗ | ✗ |
Fermentation Timer adjusts recipe timings for your actual kitchen temperature, and still tells you to judge the ferment rather than the clock.