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From fermentation timing to lamination layers — every formula is grounded in real baking science.
Quick answer
Set your desired fermentation time and dough temperature, and this works backwards to the exact yeast amount needed to hit that window. Example: a 4-hour bulk at 24°C needs noticeably more yeast than an overnight rise in the fridge.
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Live Ferment Timer
Dough temp — how warm your mixed dough feels (use a probe thermometer for accuracy). Inoculation — starter weight divided by flour weight × 100 (e.g. 100g starter in 500g flour = 20%). The timer updates as you type and shows a ±25% window because every kitchen is different. Open Start time, starter, cold retard to: set when you begin bulk fermentation and get a "ready at" clock; adjust for whether your starter is freshly fed, at peak, or hungry; or model a cold retard in the fridge. DoughRise Coach subscribers can record actual bulk times — after 3 bakes the predictions are calibrated to your kitchen, starter, and flour.
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Start time, starter, cold retard
Start time
Hours since fed
After (h)
Retard temp (°C)
Duration (h)
h
Saves to your history · calibrates after 3 bakes
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Go Bakery →🧫 Yeast Amount by Time & Temperature
"I want the bulk done in X hours at Y°C — how much yeast?" The inverse of the Fermentation Planner.
Set how many hours you want bulk fermentation to take and at what dough temperature, and this works backwards to the precise yeast percentage needed — the reverse of the Fermentation Planner, which goes from yeast % to time.
Fermentation Science
Yeast Amount by Time
& Temperature
Quick answer
Enter your target bulk fermentation time and dough temperature, and the calculator works backward to tell you exactly how much yeast to use, in IDY, ADY or fresh.
The yeast by time and temperature calculator above takes the bulk fermentation time and dough temperature you're planning around, and works backward to tell you exactly how much yeast to use, in instant dried (IDY), active dry (ADY) or fresh.
It's the exact inverse of the Fermentation Planner, which takes a yeast percentage and tells you how long fermentation will take. This calculator starts from the time you want and solves for the yeast amount that gets you there, which is the more useful direction when you're planning around a schedule rather than a recipe.
The relationship between yeast, time and temperature follows a predictable curve: less yeast and more time, or more yeast and less time, and temperature shifts the whole curve depending on how warm or cool your kitchen (or fridge) is running.
How little yeast a long, cool fermentation actually needs.
0.2%
IDY for a 12h rise at 20°C
Halves
Yeast needed per 10°C rise
Free
No account needed
How It Works
The Q10 rule: why yeast amount halves every 10°C
Yeast activity roughly follows a Q10 relationship: for every 10°C rise in dough temperature, the fermentation rate roughly doubles, which means you need roughly half as much yeast to hit the same fermentation time. Drop the temperature by 10°C and you need roughly double the yeast instead. The calculator's baseline is 0.2% instant yeast for a 12-hour bulk ferment at 20°C, and it scales up or down from there using that doubling relationship.
It's a genuinely useful mental shortcut at room-to-warm kitchen temperatures, but it starts to break down in the fridge. Below about 10°C, yeast activity slows more sharply than a clean exponential curve predicts, since the yeast is approaching dormancy rather than just fermenting more slowly, so treat calculated figures for cold retard timings as a starting point to check against, not a fixed rule.
Worked example: a 4-hour same-day dough at 24°C
- IDY: about 0.455% of flour weight
- ADY: 0.455% × 1.5 ≈ 0.683%
- Fresh: 0.455% × 3 ≈ 1.365%
- For 500g flour: roughly 2.3g IDY, 3.4g ADY, or 6.8g fresh yeast
Compare that to the 12-hour, 20°C baseline above and you can see the doubling relationship at work: a warmer, faster dough needs noticeably more yeast to hit a much shorter time.
Common mistakes
Treating the Q10 rule as exact below 10°C
The doubling relationship is a solid approximation in the temperature range most kitchens sit in, but cold retard fermentation (fridge temperatures) slows down faster than the clean exponential curve suggests, since yeast is nearing dormancy rather than just fermenting more slowly. Treat cold figures as a starting estimate rather than gospel.
Forgetting the yeast form when copying a percentage
0.2% means something different depending on whether it’s IDY, ADY or fresh yeast. Copying a percentage from one form into a recipe that expects another without converting (roughly 1 : 1.5 : 3 for IDY : ADY : fresh) will leave the dough under- or over-yeasted.
Frequently Asked
Questions about
yeast amount by time and temperature
How much yeast do I need for an overnight rise?
For a 12-hour overnight bulk ferment at 20°C, use about 0.2% instant yeast (1g per 500g flour). Cooler kitchens or fridges need even less.
Is this the same maths as the Fermentation Planner?
Yes, this is the exact inverse. The Fermentation Planner takes a yeast amount and tells you how long it’ll take; this takes your desired time and tells you the yeast amount. Enter 0.2% yeast at 20°C into the Fermentation Planner and you’ll get exactly 12 hours back.
What if it says I need almost no yeast?
Below about 0.03%, commercial yeast becomes impossible to measure accurately by weight, so switch to a poolish, biga, or sourdough starter instead (see the Preferment or Total Formula calculators).
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