Dough Proofing Calculator - Rising Time for Yeast & Sourdough

Your dough doubled in 40 minutes last time - today it has been 90 and nothing happened

Proofing time is not a fixed number. It depends on three variables: how much yeast or starter you used, the ambient temperature, and whether you are doing a first proof (bulk fermentation) or a second proof (after shaping). Change any one of them and the rising time shifts by hours. This calculator accounts for all three and gives you a range - not a single number - because dough is biology, not clockwork.

THE PROBLEM

Recipes say "let the dough rise until doubled, about 1 hour." But your kitchen is 18C today, not 26C like the recipe author's. That one difference nearly doubles the proofing time. Cold retard in the fridge? Now you are looking at 8-16 hours instead of 1. Without a temperature correction, you either underproof (dense crumb, no oven spring) or overproof (collapsed loaf, sour taste).

THE SOLUTION

This calculator uses a simplified Q10 rule: every 8C change doubles or halves fermentation speed. It covers four dough types (fresh yeast, instant yeast, sourdough, mixed), adjusts for baker's percentage of yeast/starter, corrects for temperature (4-40C range) and differentiates between first and second proof. The output is a time range (+/- 20%) with practical warnings for overproofing and cold retard.

How to use this calculator - step by step

Dough type - choose between fresh yeast, instant yeast, sourdough or a sourdough+yeast mix. Each has a different base fermentation speed.
Yeast/starter amount - enter baker's percentage (grams per 100 g flour). Fresh yeast: typically 1-3%. Instant: 0.3-1%. Sourdough starter: 15-40%.
Temperature - the ambient temperature where the dough will proof. 4C = fridge, 24-28C = standard, 30C+ = accelerated.
Proof stage - first proof (bulk fermentation, dough should double) or second proof (after shaping, about 55% of the first).
Read the results - estimated time range, temperature correction factor, interpretation, practical tips and overproofing warnings.

Temperature vs rising time - reference table

Based on 2% fresh yeast, first proof. The Q10 rule: every 8C shift doubles or halves the time.

Temperature	First proof	Second proof	Use case
4C (fridge)	10-16 h	8-10 h	Overnight cold retard
16C	2.5-3.5 h	1.5-2 h	Cool kitchen in winter
24C	1.5-2 h	45-60 min	Standard room temperature
28C	1-1.5 h	30-50 min	Warm summer kitchen
35C	35-55 min	20-30 min	Proofing box / oven with light on

Yeast type comparison

Type	Typical %	Conversion ratio	Notes
Fresh yeast	1-3%	1x (baseline)	Sold in blocks, refrigerated. Most common in European baking.
Instant yeast	0.3-1%	1g instant = 2.85g fresh	Dry, shelf-stable. Add directly to flour.
Sourdough starter	15-40%	-	Wild yeast + bacteria. 3-6x slower than commercial yeast.
Mixed	20-25% total	-	Sourdough flavor + yeast reliability. Faster than pure sourdough.

Practical examples

Pizza dough, 2% fresh yeast, 24C, first proof: Estimated 1 h 20 min - 2 h. Standard timing. Dough should double and show small bubbles on the surface.

Sourdough bread, 20% starter, 24C, first proof: Estimated 5 h 36 min - 8 h 24 min. Plan for a full day or start in the morning for an evening bake.

Overnight cold retard, 1% fresh yeast, 4C, first proof: Estimated 10-16 hours. Shape in the evening, fridge overnight, bake in the morning. The dough develops complex, slightly tangy flavor.

Brioche, 3% fresh yeast, 28C, second proof: Estimated 24-36 min. Rich dough with butter and eggs rises faster due to high yeast and warm temperature. Watch closely - the window between "ready" and "overproofed" is tight.

Mixed dough, 20% starter + 0.5% instant, 22C, first proof: Estimated 3 h - 4 h 30 min. The yeast gives a safety net while the starter adds flavor. Faster than pure sourdough, more complex than pure yeast.

FAQ

What is the difference between first proof and second proof?

First proof (bulk fermentation) is the main rise after mixing. The dough develops gluten structure and flavor. It should roughly double in volume. Second proof happens after shaping - it is shorter (about 55% of the first) and gives the shaped loaf its final volume before baking.

How do I know if my dough has overproofed?

Signs of overproofing: the dough collapses when touched, smells excessively sour, has a flat or concave top instead of domed, and the poke test indent does not spring back at all. In the oven, overproofed dough has poor oven spring and a dense, gummy crumb.

Can I use the fridge to slow down proofing?

Yes - cold retarding at 4-6C slows fermentation dramatically. A dough that takes 1.5 hours at 24C might take 10-16 hours in the fridge. The benefit: slower fermentation develops more complex flavors and acids, producing better-tasting bread with a more open crumb.

How do I convert fresh yeast to instant yeast?

Divide by 2.85. So 10 g fresh yeast = 3.5 g instant yeast. Instant yeast is more concentrated because it has less moisture. You can add instant yeast directly to the flour without dissolving it first.

Why does sourdough take so much longer?

Commercial yeast is a concentrated colony of Saccharomyces cerevisiae - billions of cells per gram, all producing CO2. Sourdough starter contains wild yeast plus lactobacillus bacteria, in much lower concentrations. The bacteria also compete with the yeast for sugars. Result: 3-6x slower rising, but with more complex flavor from the acids.

At what temperature does yeast die?

Yeast starts suffering above 38C and dies at 42-45C. That is why you never add hot water directly to yeast. For water temperature, use the DDT (Desired Dough Temperature) method - see the Dough Water Temperature Calculator linked below.

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