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.
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.