The desired dough temperature formula
Dough temperature controls how fast fermentation goes, so bakers aim for a specific final dough temperature (often around 75–78 °F / 24–26 °C). Every ingredient and the mixing contribute heat, so the water temperature is what you adjust:
water = DDT × 3 − (flour + room + friction)
With a preferment such as a levain or poolish, it becomes a four-part formula:
water = DDT × 4 − (flour + room + preferment + friction)
Use the same unit (°F or °C) for every value.
Measuring your friction factor
Friction factor is the heat your mixing adds. Hand mixing adds little; machine mixing adds much more, depending on the mixer, speed and time. To measure it, mix a batch, take the final dough temperature and calculate:
friction = final dough temp × 3 − (flour + room + water) (× 4 and include the preferment if you used one)
Then use that number for future batches made the same way.
Example
Target 76 °F, flour 70 °F, room 72 °F, hand mixed (friction 2 °F), no preferment: water = 76 × 3 − (70 + 72 + 2) = 84 °F.
Frequently asked questions
What is desired dough temperature?
The temperature you want the dough to be right after mixing. It makes fermentation times predictable; many breads aim for about 75–78 °F (24–26 °C).
Why multiply by 3 or 4?
Because you are averaging three (or four, with a preferment) heat sources: flour, room, water and preferment, with friction added on top.
What if the water temperature comes out below freezing?
Use ice-cold water, chill the flour, or mix in a cooler spot. You can also accept a slightly warmer dough and shorten the fermentation.