Exact 68% Sourdough Ratio for 450g Flour: 292g Water vs 306g Apparent (1 Standard Loaf)
Baker's math for 450g flour at 68% (842g dough, 1 standard loaf): 292g corrected water vs 70.9% drift.
For 450g main flour at 68% hydration with 90g active 100% starter, pouring 306g water inflates moisture to 70.9% (+2.9% surge) via 45g starter flour and 45g starter water. Deducting 14g down to 292g main water with 9.9g salt (842g batch) locks True Total Hydration at 68.08% (target 68%) over 495g system flour.
- Strict True Hydration Water
- 292gLocks True Total Hydration at 68.08% (target 68%, -14g)
- Unadjusted Apparent Water
- 306gPushes True Hydration to 70.9% (+2.9% surge)
- 20% Active Starter & Salt
- 90g / 9.9g45g hidden flour + 45g hidden water
- Stickiness & Rheology
- 2 / 5 StarsBeginner Friendly (Balanced extensibility)
5-Point Stoichiometry & Levain Split Chart Centered on 450g / 68%
Pre-computed gram weights around 450g main flour where 292g water locks True Total Hydration at 68.08% (target 68%).
| Batch & Seed Spec | Flour Breakdown | Levain Split | Corrected Water (68% Ref) | Salt & Dough Mass | Apparent vs Locked |
|---|---|---|---|---|---|
| 400g @ 66% (15% Seed) Compact Mix (-50g) | 400g + 30g = 430g (68%/450g ref) | 60g (30gF/30gW @ 100%) | 254g W (vs 264g app @ R1) | 8.6g salt (714g dough) | 68.4% drift → 66.05% (66% goal) |
| 450g @ 66% (18% Seed) Conservative Pour | 450g + 45g = 495g (68%/450g ref) | 81g (45gF/36gW @ 80%) | 291g W (vs 297g app @ R2) | 9.9g salt (822g dough) | 67.3% drift → 66.06% (66% goal) |
| 450g @ 68% (20% Seed) [Locked Benchmark] | 450g + 45g = 495g (68%/450g ref) | 90g (45gF/45gW @ 100%) | 292g W (vs 306g app @ R3) | 9.9g salt (832g dough) | 70.9% drift → 68.08% (68% goal) |
| 450g @ 70% (22% Seed) Open-Crumb Push | 450g + 50g = 500g (68%/450g ref) | 99g (50gF/49gW @ 100%) | 301g W (vs 315g app @ R4) | 10.0g salt (850g dough) | 72.8% drift → 70.0% (70% goal) |
| 500g @ 70% (25% Seed) Expanded Loaf (+50g) | 500g + 56g = 556g (68%/450g ref) | 125g (56gF/69gW @ 125%) | 320g W (vs 350g app @ R5) | 11.1g salt (945g dough) | 75.4% drift → 69.96% (70% goal) |
Interactive Hydration × Flour Weight Formula Calculator
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True 68.08% vs 70.9% Apparent Hydration on 450g Flour (90g Starter)
Multiplying 450g flour by 68% gives 306g apparent water, but adding 90g starter (45g flour + 45g water) shifts system totals to 351g water over 495g flour (70.9%, +2.9% drift). Deducting 14g down to 292g main water (337g total water) locks True Total Hydration at 68.08% (target 68%).
Glutenin macropolymer alignment for 450g flour at 68% hydration improves when 263g water (90% of 292g) swells endosperm proteins for 45 minutes prior to adding 90g acidic levain, 9.9g salt, and 29g reserved water—preventing the 70.9% slump of 306g water.
Bench & Dutch Oven Protocol for 1 Standard Loaf (450g Flour @ 68% Hydration)
- Autolyse Soak (263g W + 450g F): Hydrate 450g flour with 263g water (90% of 292g) for 45 min before adding 90g starter.
- Levain & Bassinage (90g starter + 9.9g salt + 29g W): Dimple 90g ripe levain (45gF/45gW) and 9.9g salt with 29g water to hit 68.08% (68%).
- Coil Fold Cadence (2/5 Tack, 842g Dough): Space 4 wet-hand folds 30 min apart to align the 495g flour network (balanced stretch).
- Bulk Cutoff & 450°F Bake (1 Standard Loaf): Ferment at 75°F to +50% aliquot rise, cold-retard 14 hrs at 38°F, and bake covered 20 min + uncovered 22 min.
Frequently Asked Questions for This Hydration × Flour Weight Formula Spec
How much water do I need for 450g of flour at 68% hydration?
Multiplying 450g by 68% gives 306g apparent water, which drifts to 70.9% (+2.9%) with 90g starter. Weighing 292g main water (-14g cut) locks True Total Hydration at 68.08% (target 68%).
How much water should I hold back for bassinage in a 450g flour / 68% dough?
Out of 292g corrected main water for 450g flour at 68%, mix 263g (90%) during the 45-minute autolyse and trickle in 29g (10%) with 90g starter and 9.9g salt.
How much water do I deduct for 90g starter in a 450g / 68% recipe?
Deduct 14g of water from the 306g apparent weight (pouring 292g main water instead) to offset the +2.9% surge (70.9%) from 90g starter (45gW/45gF).