FlourScaleWhy dough temperature matters
Yeast and sourdough cultures are very sensitive to temperature. A dough that comes off the mixer at 72°F (22°C) can take noticeably longer to rise than the same dough at 78°F (26°C). Professional bakers control fermentation by targeting a desired dough temperature (DDT) — commonly in the range of 75–78°F (24–26°C) for many yeasted and sourdough breads — so that a recipe's timings are repeatable from summer to winter.
Of all the things that affect dough temperature, water is the easiest to change. You cannot quickly change the temperature of your kitchen or your flour, but you can run the tap warmer or colder, or add ice. The DDT formula tells you exactly how warm the water should be.
The DDT formula
Multiply your desired dough temperature by the number of temperature factors, then subtract the factors you already know:
- Straight dough (3 factors): water = DDT × 3 − (room + flour + friction)
- With a preferment or levain (4 factors): water = DDT × 4 − (room + flour + preferment + friction)
The friction factor is the heat added by mixing. It depends on your mixer, speed and mixing time, so the best value is one you measure. Make a batch, record the room, flour and water temperatures, measure the dough right after mixing, and calculate: friction = (dough temp × 3) − (room + flour + water). As a rough starting point, hand-mixed doughs pick up only a few degrees, while stand mixers kneading for several minutes often add around 20–30°F. In Celsius the friction number is smaller (multiply the Fahrenheit figure by 5/9), so measure it in the unit you use.
Worked example
Target 76°F. Room 72°F, flour 70°F, stand-mixer friction factor 24°F, no preferment.
- Total factor: 76 × 3 = 228
- Known: 72 + 70 + 24 = 166
- Water = 228 − 166 = 62°F
The same dough in Celsius: target 24°C, room 22°C, flour 21°C, friction 13°C → water = 72 − 56 = 16°C.
Practical tips
- Use an instant-read probe thermometer and measure flour from its storage container, not the bag's label.
- If the result is below about 33°F (1°C), use ice-cold water, chill the flour, or shorten the mixing time — water cannot usefully be colder than ice.
- If the result is very hot, warm the flour or the room instead; water above about 110°F (43°C) can stress yeast.
- Keep a log of DDT, actual dough temperature and fermentation time. After a few bakes your friction factor and timings become very predictable.