Pizza Dough Fermentation Calculator
Estimate how much yeast your pizza dough needs from its temperature, the hours you'll ferment, and the method. Warmer and longer means less yeast; colder means more. Treat the result as a well-reasoned starting point, not a guarantee.
Fridge ≈ 4 °C (39 °F), room ≈ 20–24 °C (68–75 °F).
Advanced: calibrate the baseline
Every value here is editable. If a batch you trust used a known yeast amount at a known temperature and time, set these to that batch and the estimates will track your kitchen.
Formula & how it works
Yeast % = base% × (base time ÷ time) × 2^((base temp − temp) ÷ doubling interval), then multiplied by the yeast-type factor (IDY 1, ADY ~1.33, fresh ~3).
The idea: fermentation rate roughly doubles per doubling-interval degrees of warmth, and more time means less yeast for the same rise. At the base temperature and time the result returns the base percentage exactly, which is why calibrating the baseline to a batch you trust makes it yours.
Worked example
From a baseline of 0.4% IDY at 20 °C over 8 hours: a same-day room proof at 22 °C for 6 hours lands near 0.46%, while a 2-day fridge cold ferment at 4 °C for 48 hours drops to about 0.20%. Switch to active dry yeast and multiply by roughly 1.33; fresh yeast by about 3.
Reading the estimate
Why temperature and time trade off
Yeast works faster when it's warm, so the same rise takes less yeast if the dough is warmer or given longer. That trade-off is the whole engine here: push the time out or the temperature up and the yeast figure falls; go cold or short and it climbs. The doubling-per-ten-degrees rule is a rough biological approximation that holds well enough across normal dough temperatures to be useful.
Where it stops being exact
No single formula captures a real dough. Salt slows yeast, sugar can speed it or stress it, stronger flour holds gas longer, and strains differ batch to batch. That's why the result is framed as an estimate — it gets you into the right neighborhood so you're not guessing wildly, but the last adjustments come from watching how your dough proofs.
Calibrate it to your kitchen
The most reliable way to use this is to anchor the baseline to a bake you already like. Open the advanced panel and set the base yeast, temperature, and time to that known-good batch; from then on the tool scales your result to new schedules rather than a generic one. A couple of iterations will get you a personal model that beats any default.