Exact 68% Sourdough Ratio for 1000g Flour: 648g Water vs 680g Apparent (2-Loaf Batch)
Baker's math for 1000g flour at 68% (1870g dough, 2-loaf batch): 648g corrected water vs 70.9% drift.
Mixing 1000g unbleached flour, 680g water, and 200g liquid starter pushes real hydration to 70.9% (+2.9% overshoot) across 1100g total grain. Measuring 648g corrected water (583g autolyse + 65g bassinage), 200g levain, and 22g salt removes 32g excess water and locks True Total Hydration at 68.0% (target 68%).
- Strict True Hydration Water
- 648gLocks True Total Hydration at 68.0% (target 68%, -32g)
- Unadjusted Apparent Water
- 680gPushes True Hydration to 70.9% (+2.9% surge)
- 20% Active Starter & Salt
- 200g / 22g100g hidden flour + 100g hidden water
- Stickiness & Rheology
- 2 / 5 StarsBeginner Friendly (Balanced extensibility)
5-Point Stoichiometry & Levain Split Chart Centered on 1000g / 68%
Pre-computed gram weights around 1000g main flour where 648g water locks True Total Hydration at 68.0% (target 68%).
| Batch & Seed Spec | Flour Breakdown | Levain Split | Corrected Water (68% Ref) | Salt & Dough Mass | Apparent vs Locked |
|---|---|---|---|---|---|
| 950g @ 66% (15% Seed) Reduced Flour (-50g) | 950g + 72g = 1022g (68%/1000g ref) | 143g (72gF/71gW @ 100%) | 604g W (vs 627g app @ R1) | 20.4g salt (1697g dough) | 68.3% drift → 66.05% (66% goal) |
| 1000g @ 66% (18% Seed) Stiffer Step (-2%) | 1000g + 100g = 1100g (68%/1000g ref) | 180g (100gF/80gW @ 80%) | 646g W (vs 660g app @ R2) | 22.0g salt (1826g dough) | 67.3% drift → 66.0% (66% goal) |
| 1000g @ 68% (20% Seed) [Primary Formula] | 1000g + 100g = 1100g (68%/1000g ref) | 200g (100gF/100gW @ 100%) | 648g W (vs 680g app @ R3) | 22.0g salt (1848g dough) | 70.9% drift → 68.0% (68% goal) |
| 1000g @ 70% (22% Seed) Wetter Step (+2%) | 1000g + 110g = 1110g (68%/1000g ref) | 220g (110gF/110gW @ 100%) | 667g W (vs 700g app @ R4) | 22.2g salt (1887g dough) | 73.0% drift → 70.0% (70% goal) |
| 1050g @ 70% (25% Seed) Up-Scaled (+50g) | 1050g + 117g = 1167g (68%/1000g ref) | 263g (117gF/146gW @ 125%) | 671g W (vs 735g app @ R5) | 23.3g salt (1984g dough) | 75.5% drift → 70.01% (70% goal) |
Interactive Hydration × Flour Weight Formula Calculator
Compare your exact mixing bowl dimensions, flour protein percentage, or discard weight in real time.
True 68.0% vs 70.9% Apparent Hydration on 1000g Flour (200g Starter)
Fermentation enzymatics inside 200g starter cleave proteins across 100g flour while releasing 100g unbound water into your 1000g dough. Avoiding the 70.9% (+2.9%) slump of an unadjusted 680g pour requires 648g water (583g + 65g) and 22g salt, which locks True Total Hydration at 68.0% (target 68%).
At 68% target hydration (68.0%), the 1870g dough (1000g flour + 648g water + 200g starter) displays balanced extensibility and balanced elasticity (2/5 stickiness). Holding 65g water back from the 583g autolyse protects disulfide cross-links with 22g salt.
Bench & Dutch Oven Protocol for 2-Loaf Batch (1000g Flour @ 68% Hydration)
- Endosperm Saturation (1000g Flour / 583g Water): Rub 583g water into 1000g flour (saving 65g of 648g) and rest 40 min.
- Ionic Salt & Culture Mix (200g Levain + 22g Sea Salt): Pinch 200g peaked starter and 22g salt dissolved in 65g water into the 1870g batch (-32g vs 680g).
- Rheological Laminations (68% / 68.0%): Perform 1 bench lamination plus 3 coil folds every 35 min for balanced tenacity across 1100g system flour.
- Cold Proof & Dutch Oven Spring (1870g): Preshape at +50% expansion, stitch into a banneton for 12–16 hrs at 38°F, score at 45°, and bake at 450°F.
Frequently Asked Questions for This Hydration × Flour Weight Formula Spec
How does changing starter from 20% (200g) to 15% (150g) affect 1000g flour at 68%?
Dropping starter from 200g to 150g on 1000g flour reduces hidden starter water from 100g to 75g, raising required main water from 648g to 656g for 68%.
What baking temperature works best for a 1870g loaf (1000g flour @ 68%)?
Bake your 1870g (2-Loaf Batch) dough made from 1000g flour, 648g water (68.0%), 200g starter, and 22g salt in a preheated 450°F (232°C) Dutch oven for 20 min covered + 22 min uncovered.
How much water do I need for 1000g of flour at 68% hydration?
Multiplying 1000g by 68% gives 680g apparent water, which drifts to 70.9% (+2.9%) with 200g starter. Weighing 648g main water (-32g cut) locks True Total Hydration at 68.0% (target 68%).