Does lower temperature make the time longer?
Yes. In this estimate, current temperature below the recipe temperature increases fermentation time.
Kitchen
Fermentation Time Temperature Adjuster
When room temperature differs from a recipe's proofing temperature, estimate timing with a rough speed-doubling-per-10°C guide.
Updated: May 15, 2026
Input
Adjust rough dough fermentation time from a recipe temperature to your current temperature.
Uses the rough guide that fermentation speed doubles per 10°C. Yeast amount, sugar, salt, dough temperature, and humidity also matter.
Result
1.5 hr
Adjusted time
+31 min
Time difference
1.52x
Time ratio
Judge fermentation by dough expansion, bubbles, and aroma rather than time alone. Cold long fermentation and sourdough are out of scope.
Use this as a guide and adjust for your real conditions.
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How to use
- Enter the recipe's base fermentation time in minutes.
- Enter recipe temperature and current temperature.
- Adjusted time, difference, and time ratio appear on the right.
Useful tips
- Useful when you want to estimate bread proofing time in winter; adjust inputs to compare outcomes.
- Useful when you want to adjust when room temperature differs from a recipe; adjust inputs to compare outcomes.
- Prefer product labels, recipe notes, and equipment markings when available.
- When unsure, start with a smaller or shorter estimate and adjust from the actual result.
Formula
Adjusted time = base time × speed factor ^ ((recipe temp - current temp) ÷ 10). The default speed factor is 2 per 10°C.
Notes
- Judge fermentation by dough expansion, bubbles, and aroma, not time alone.
- Yeast amount, sugar, salt, dough temperature, humidity, and flour type change results.
- Cold long fermentation, sourdough, and food-safety decisions are out of scope.
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FAQ
Will fermentation always finish at this time?
No. This is planning guidance only. Check the actual dough condition.
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