Fresh Milled Flour Hydration Calculator
Grain-specific water figures for the bake you are actually making — plus the levain arithmetic most recipes leave out.
Calculate your hydration
Result
379 g
Water to add · Hard red wheat · Sourdough boule · 78–83%
Hold back up to 28 g to add after the rest.
Rest 20–30 minutes after mixing before adding more water, then add in 10–20 g increments.
Range 379–407 g
Levain maths
Total dough hydration counts the levain’s flour and water, so the water you pour in is less than the headline percentage suggests.
Result
348 g
Water · All-purpose flour → Hard red wheat, at 7–10% more water
Hold back up to 10 g to add after the rest.
Rest 20–30 minutes after mixing before adding more water, then add in 10–20 g increments.
Range 348–358 g
Figures come from this site’s published conversion guide for that exact pair. This is a starting point — check the dough again after the rest period below before deciding it is too dry.
Rest 20–30 minutes after mixing before adding more water, then add in 10–20 g increments.
Fresh milled ferments 10–25% faster than refined. Check the dough sooner; never extend bulk to compensate.
Hydration by grain and bake type
Baker’s percentages for a 100% single-grain dough. Water carried in a starter or levain is counted separately. Blank cells are genuine gaps, not omissions — where we have not tested and published guidance, we say so.
| Grain | Sandwich loaf | Yeasted boule | Sourdough boule | Pizza | Focaccia |
|---|---|---|---|---|---|
| Hard white wheat | 70–72% | 72–75% | 75–80% | 63–68% | 80–85% |
| Hard red wheat | 73–75% | 75–78% | 78–83% | 66–71% | 83–88% |
| Spelt | 65% | 66–68% | 70% | 65–68% | No guidance yet |
| Einkorn | 55–60% | No guidance yet | 60–65% | No guidance yet | No guidance yet |
| Rye | 75–80% | No guidance yet | 80–90% | No guidance yet | No guidance yet |
Why fresh milled needs more water than refined
A bag of all-purpose flour is endosperm with the bran and germ milled away. Fresh milled flour is the whole kernel, and bran is thirsty — it holds several times its own weight in water, and it takes its time doing it. Match a refined recipe gram for gram and the dough will be tight, the crumb dense and the crust pale.
Add 5–15% more water than a refined-flour recipe calls for. Start at +8%. Coarser mills and fresher, harder berries sit at the top of that band. Rest 20–30 minutes after mixing before adding more water, then add in 10–20 g increments.
The levain maths
A levain is flour and water, so it changes both sides of the percentage. Split it first: at a given levain hydration, the flour it contributes is its weight divided by one plus that hydration, and the water is whatever is left over. Add the levain flour to your dough flour to get total flour, multiply by your target hydration to get total water, then subtract the water already in the levain. What remains is what you pour into the bowl.
Skip that subtraction and you overshoot by the levain’s own water every single time, which is why so many first sourdough boules turn into puddles. The calculator shows each step rather than just the answer.
Frequently Asked Questions
What hydration should I use for fresh milled flour?
It depends on the grain and the bake. A hard red wheat sandwich loaf runs 73–75%; the same grain as a sourdough boule runs 78–83%; hard white wheat sits a few points lower at 70–72% for a sandwich loaf. Einkorn is the outlier at 55–60%. Use the calculator above to get the figure and the grams for your flour weight.
How much more water does fresh milled flour need than store-bought flour?
Add 5–15% more water than a refined-flour recipe calls for. Start at +8%. The bran and germ absorb water that refined endosperm never held, so a recipe written for supermarket flour is always short. Convert the recipe rather than guessing, and check the dough again after the rest period.
Why does my fresh milled dough feel dry at the mixer and wet later?
Bran hydrates slowly, so the dough keeps drinking after you stop mixing. Rest 20–30 minutes after mixing before adding more water, then add in 10–20 g increments. Judging hydration in the first few minutes is the single most common way bakers end up with a slack, unmanageable dough.
Does fresh milled flour ferment faster or slower?
Faster. Fresh milled ferments 10–25% faster than refined. Check the dough sooner; never extend bulk to compensate. The bran and germ carry the enzymes, nutrients and microbial load the endosperm does not, so bulk finishes early. Watch the dough, not the clock in the recipe.
How do I hydrate an enriched dough made with fresh milled flour?
Start from the lean figure for that grain and bake type, then adjust down. Subtract 8–12% from the lean equivalent. Fat and sugar compete for water. Butter, eggs and sugar all compete with the flour for water, so a brioche or cinnamon-roll dough at the lean sandwich figure will be far too slack. The calculator applies this for you when you switch the enriched toggle on.
Related
Where a grain and bake type have no published figure the calculator says “No guidance yet for this combination.” rather than borrowing a neighboring number. Einkorn pizza is one of those gaps.