Hydration × flour
78% Hydration Light Rye Flour
Noticeably open, shiny crumb. Irregular medium-to-large holes. Glossy cell walls. Moist texture.
Within Light Rye Flour's workable range (68–80%)
Is 78% hydration right for Light Rye Flour?
Light Rye Flour's workable hydration range is 68–80%. Its absorption multiplier is 1.03× bread flour. At 78%, you are in the sweet spot — the dough will handle predictably and produce the crumb described above.
Absorption math for Light Rye Flour at 78%
A recipe written for bread flour at 78% hydration, when substituted with 100% Light Rye Flour, becomes 80% effective hydration (because Light Rye Flour absorbs 3% more water). Handles closer to wheat than medium or dark rye — light stretch-and-folds are fine at low percentages. Keep the bulk ferment a touch shorter than an all-wheat dough; rye enzymes speed fermentation. Above ~40% rye, switch to no-knead rye handling (mix, rest, wet hands, tight banneton).
Technique at 78% hydration
Upper range of 'standard' hearth hydration. Benefits from high-extraction flour which tolerates the hydration. Use coil folds instead of stretch-and-folds to build structure without deflating. Cold retard mandatory.
Worked water math for a 500 g batch
| Light Rye Flour | 500 g (100%) |
| Water | 390 g (78%) |
| Salt | 10 g (2%) |
Add your levain on top of these weights; the calculator below subtracts the flour and water it already contributes so the bench numbers land at 78% exactly.
What Light Rye Flour gives you at 78%
At 78% hydration you can expect a very open, glossy, holey crumb — the signature of a high-hydration hearth loaf. A slack, sticky dough: work with wet hands, use coil folds rather than aggressive stretches, give a full bench rest after pre-shaping, and shape decisively — hesitation lets it spread.
Light Rye Flour at 78% — FAQ
How much water do I use for Light Rye Flour at 78% hydration?
Multiply the flour weight by 0.78. For a 500 g batch of Light Rye Flour that's 390 g water, plus about 10 g salt (2%). Light Rye Flour absorbs 1.03× as much water as white bread flour, so it will feel a touch stiffer than the 78% number suggests.
Is 78% hydration right for Light Rye Flour?
Yes — Light Rye Flour's workable range is 68–80%, and 78% sits inside it, so the dough handles predictably and gives a very open, glossy, holey crumb — the signature of a high-hydration hearth loaf.
What crumb will Light Rye Flour at 78% give me?
Expect a very open, glossy, holey crumb — the signature of a high-hydration hearth loaf. Noticeably open, shiny crumb. Irregular medium-to-large holes. Glossy cell walls. Moist texture.
Is Light Rye Flour at 78% beginner-friendly?
This hydration is rated intermediate. A slack, sticky dough: work with wet hands, use coil folds rather than aggressive stretches, give a full bench rest after pre-shaping, and shape decisively — hesitation lets it spread.
Calculator pre-set to 78%
Weights below assume 100% Light Rye Flour. For blends, use the main calculator on a recipe page.
- Flour to add
- 450 g
- Water to add
- 340 g
- Salt
- 10 g
- Levain @ 100%
- 100 g
- Total dough
- 900 g
- Effective hydration
- 78%
How the math works
Total water = flour × hydration %. Your levain contributes 50 g flour + 50 g water — both count toward the totals. You add only the remainder as fresh flour and water.
Salt % is computed on total flour weight, not final-dough flour.
To bake this recipe you need
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The gear that makes the math work
A short, honest baking kit. The scale matters most — every weight on this page is in grams. The Dutch oven is what turns a good crumb into a great crust.
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Light Rye Flour at every hydration level
Light Rye Flour usually works between 68% and 80% hydration — drier gives a stiffer dough, wetter a slacker one. Tap a level for the technique, the absorption math and a calculator set to it.
| Hydration | Water per 500 g | For Light Rye Flour |
|---|---|---|
| 55% | 275 g | Drier than usual |
| 60% | 300 g | Drier than usual |
| 65% | 325 g | Drier than usual |
| 70% | 350 g | In its range |
| 72% | 360 g | In its range |
| 75% | 375 g | In its range |
| 78%this page | 390 g | In its range |
| 80% | 400 g | In its range |
| 82% | 410 g | Wetter than usual |
| 85% | 425 g | Wetter than usual |
| 90% | 450 g | Wetter than usual |
| 95% | 475 g | Wetter than usual |