Guide
Desired Dough Temperature Calculator: What Water Temperature for Sourdough
Room temperature is not dough temperature. Cold flour, a warm starter, and the heat of mixing all land in the bowl. Desired dough temperature is the number you meant. Water is how you get it.
Miss the target and the bulk clock you planned is fiction. Warm dough races. Cold dough stalls. The formula is short. The calculator runs it so you are not doing arithmetic at the tap.
The number the table runs on
Desired dough temperature is the temperature of the dough right after the mix. Not the kitchen. Not the bag of flour. The dough.
A probe in the center of the mass, after the salt is in. That reading is what fermentation actually sees.
The site's bulk window is built on dough temperature, not air. A 24°C dough is the reference row. A dough that mixed at 21°C is a different row, even if the room reads 24°C. Ambient air does not get a vote.
The formula
Four temperatures. One friction term.
The water-temp formula
Water = (4 × DDT) − flour − room − starter − friction
Flour, room, starter, and the dough itself are the four. Water is the unknown. Friction is the heat the mix adds. You subtract it so the dough does not overshoot the target.
The published walk-through uses a 24°C target. Flour at 21°C. Room at 22°C. Starter at 23°C. Friction at 1°C for a light hand mix. Water lands at 29°C. That is 4 × 24, minus 21, minus 22, minus 23, minus 1.
Move one input and the water moves the other way by the same amount. Flour two degrees colder. Water two degrees warmer. A starter straight from the fridge is not the same input as a jar that peaked on the counter. Measure it.
Friction is a measured number
Hand mix, light, is the 1°C case — the calculator's default. A stand mixer adds more. Mixer friction often sits in the 4–8°C band. Set the factor for the mix you actually do.
Guessing zero on a machine is how a “24°C dough” finishes warmer than the row you picked. If you do not know your mixer, mix once and measure. Dough temperature minus the no-friction prediction is your friction. Write it down. Reuse it.
Slap-and-fold adds less heat than ten minutes on speed 2. The factor follows the method. It is not a personality trait of the recipe.
When the tap cannot do it
Water below fridge temperature means the target is out of reach from this kitchen. Ice is the fix. Or a lower DDT. The formula is reporting the room. It is not being difficult.
Water past about 38°C will shock the culture — the calculator's own range tops out there. Lower the target. Or mix gentler so friction drops and the water can come down with it. Do not “correct” a hot result by using hot water anyway.
Stone counters steal heat after the mix. The formula predicts the dough at the end of mixing. The probe confirms it. If they disagree, fix the friction factor. Do not edit the formula.
What the calculator is doing
You set the dough temperature you want. You enter flour temp, room temp, starter temp, and friction. The engine returns the water temperature that satisfies the formula.
It does not average the kitchen. It solves for the tap.
True hydration is a separate output. Water temperature does not change the percentage. It changes whether that percentage ferments on the clock you chose. A 72% dough at 20°C and the same dough at 26°C are different bakes.
Weigh the water after you know the temperature, not before. A kettle that overshoots is easier to cool than a dough that already has the salt in.
Then check the dough with a probe. If the probe misses, your friction factor is wrong. The formula already did its job.
Warm kitchen, fast bulk. Cold dough in that kitchen is still a cold dough. Water temperature is how you stop the room from choosing for you.