Sourdough Proofing Time Calculator – Fermentation Time by Temperature

Calculate adjusted bulk and final proof times based on dough temperature and reference schedules. Use temperature scaling to plan proofing.

What is this?

Proofing time (Gärzeit) is the duration a dough spends fermenting (bulk or final proof) where temperature controls the biochemical rate of fermentation. Higher temperatures accelerate yeast and bacterial activity, lower temperatures slow it. Planning proofing by temperature helps hit the desired dough maturity predictably [1][2].

Why important: Correct proofing time affects dough strength, oven spring, crumb structure, acidity development and flavor balance. Mistimed proofs cause underproofed tight crumb or overproofed weak structure and loss of oven spring [1][2].

Calculator

Adjusted fermentation time (hours) --

Uses Q10 temperature coefficient. For Q10=2 each 10°C change halves/doubles rate [1][2].

Practical note --

These are practical guidance rules-of-thumb based on fermentation kinetics [1][2].

Recommendations by Flour Type

Flour Min % Standard % Max %
% % %
% % %
% % %

Hydration Ranges

Cool (10–15°C) easy to medium

Slow fermentation, extended proofing (many hours to days), more lactic acidity and complex flavor

Moderate (16–22°C) easy

Balanced speed and flavor development, good for predictable schedules

Warm (23–30°C) medium

Fast fermentation, less acid development, higher risk of overproofing

Tips

💡 Measure dough temperature, not room air

Dough temperature is what drives fermentation. Measure with an instant-read thermometer inserted into the dough mass for accurate adjustment calculations [1].

💡 Include starter water in calculations

Water already present in your preferment/starter contributes to dough temperature and total water—account for it when planning fermentation and using the calculator [1][2].

💡 Use predictable equipment

A consistent container and method (e.g., large mixing bowl shape and covering) reduces variables so the calculator's estimate matches reality [1].

💡 Adjust using dough behavior

The calculator gives a timetable; always confirm with dough cues (volume, gluten development, feel). Time is a guide, not a substitute for observation [1][2].

💡 When in doubt, cool it

If your adjusted time is much shorter than planned, place dough in the fridge to slow fermentation and retain structure—this aids schedule control and flavor [2].

Sources

  1. [1]
    The Perfect LoafThe Perfect LoafLink
  2. [2]
    PlötzblogPlötzblogLink