Sourdough Water Temperature Calculator – Target Dough Temperature (TDT)

Calculate the required water temperature to reach your target dough temperature (TDT). Adjust for flour, room, and preferment temperatures.

What is this?

Target Dough Temperature (TDT) is the final temperature you want your mixed dough to be immediately after mixing. Controlling TDT helps predictable fermentation speed and consistency [1].

Why important: Temperature controls yeast and bacterial activity: a 3°C–5°C shift can meaningfully speed or slow fermentation. Consistent TDT gives repeatable proofing times and flavor outcomes [1][2].

Calculator

Required water temperature (°C) --

Formula: Water = (Target × 4) − Room − Flour − Preferment − Friction. Verify with an instant-read thermometer [1][2].

Practical note --

Recommendations by Flour Type

Flour Min % Standard % Max %
Typical target 22% 24% 26%
Warmer ferment for sour 26% 27% 28%

Hydration Ranges

under 21°C easy

Slow fermentation — more acidity, denser crumb

21–26°C standard

Balanced fermentation, good flavor and structure

over 26°C advanced

Faster fermentation — less acidity, risk of overproof

Tips

💡 Measure temperatures accurately

Weigh ingredients on a Digital Kitchen Scale and measure temperatures with an instant-read thermometer. Accuracy ±0.5°C improves repeatability.[1][2]

💡 Include preferment water and starter

Remember that water in your starter/pre-ferment contributes to the final dough temperature and total water — include it in calculations [2].

💡 Adjust room or flour rather than extreme water

If calculator gives very hot or cold water, warm the flour in a large mixing bowl in warm room or chill your preferment slightly — extreme water temps can harm yeast.[1]

💡 Use consistent mixing friction estimate

Mechanical mixing adds heat. For hand mixing assume +1–2°C; for intensive mixer +3–5°C — measure your actual mix to refine the estimate [1].

💡 Keep a log

Record TDT, actual measured dough temp after mixing, and fermentation times. This builds reliable adjustments for your environment [2].

💡 Tools to have

Helpful tools: Digital Kitchen Scale, Instant-Read Thermometer, Glass Jar for Starter, Dough Whisk for even mixing.

Sources

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