Exact 68% Sourdough Ratio for 500g Flour: 324g Water vs 340g Apparent (1 Standard Loaf)
Baker's math for 500g flour at 68% (935g dough, 1 standard loaf): 324g corrected water vs 70.9% drift.
Because 100g of 100% levain supplies 50g water and 50g flour to 500g main flour (550g system flour), adding 340g water spikes dough hydration to 70.9% (+2.9%). Using 324g water (292g + 32g) and 11g salt (935g yield) locks True Total Hydration at 68.0% (target 68%).
- Strict True Hydration Water
- 324gLocks True Total Hydration at 68.0% (target 68%, -16g)
- Unadjusted Apparent Water
- 340gPushes True Hydration to 70.9% (+2.9% surge)
- 20% Active Starter & Salt
- 100g / 11g50g hidden flour + 50g hidden water
- Stickiness & Rheology
- 2 / 5 StarsBeginner Friendly (Balanced extensibility)
Batch Mass & Bassinage Sensitivity Grid (500g Flour / 324g Water)
Neighborhood sensitivity across 500g ± 50g flour and 68% ± 2% hydration (100g starter, 11g salt, 935g dough).
| Batch & Seed Spec | Flour Breakdown | Levain Split | Corrected Water (68% Ref) | Salt & Dough Mass | Apparent vs Locked |
|---|---|---|---|---|---|
| 450g @ 66% (15% Seed) Reduced Flour (-50g) | 450g + 34g = 484g (68%/500g ref) | 68g (34gF/34gW @ 100%) | 285g W (vs 297g app @ R1) | 9.7g salt (803g dough) | 68.4% drift → 65.91% (66% goal) |
| 500g @ 66% (18% Seed) Stiffer Step (-2%) | 500g + 50g = 550g (68%/500g ref) | 90g (50gF/40gW @ 80%) | 323g W (vs 330g app @ R2) | 11.0g salt (913g dough) | 67.3% drift → 66.0% (66% goal) |
| 500g @ 68% (20% Seed) [Primary Formula] | 500g + 50g = 550g (68%/500g ref) | 100g (50gF/50gW @ 100%) | 324g W (vs 340g app @ R3) | 11.0g salt (924g dough) | 70.9% drift → 68.0% (68% goal) |
| 500g @ 70% (22% Seed) Wetter Step (+2%) | 500g + 55g = 555g (68%/500g ref) | 110g (55gF/55gW @ 100%) | 334g W (vs 350g app @ R4) | 11.1g salt (944g dough) | 73.0% drift → 70.09% (70% goal) |
| 550g @ 70% (25% Seed) Up-Scaled (+50g) | 550g + 61g = 611g (68%/500g ref) | 138g (61gF/77gW @ 125%) | 351g W (vs 385g app @ R5) | 12.2g salt (1039g dough) | 75.6% drift → 70.05% (70% goal) |
Dynamic Stoichiometric Workbench (324g)
Test custom loaf weights or alternative fermentation schedules directly against the 340g benchmark above.
True 68.0% vs 70.9% Apparent Hydration on 500g Flour (100g Starter)
Gravimetric auditing of 500g flour plus 100g starter shows 550g total dry base and 374g target water for 68% hydration. Because the levain already supplies 50g water, cutting 340g by 16g down to 324g (with 11g salt in a 935g batch) locks True Total Hydration at 68.0% (target 68%).
When 500g flour is mixed to 68% (68.0%) using 324g water, 100g levain, and 11g salt (935g total), reserving 32g water from the 292g autolyse keeps dough stickiness at 2/5 instead of drifting to 70.9%.
Rheological Handling Guide (2/5 Tack) for 500g Flour at 68%
- Initial Water Binding (292g W on 500g F): Hydrate 500g flour using 292g water (leaving 32g for stage 2 of 324g) for 45 min.
- Levain & Salinity Lock (100g Starter + 11g Salt): Fold in 100g 100% starter and 11g salt with 32g water, avoiding 340g (70.9%) drift.
- Fold Cadence for 68% (2/5 Stickiness): Space 4 wet-hand tuck-and-folds across 2 hours to reinforce the 935g (550g flour) network.
- Final Proof & Oven Spring (1 Standard Loaf): Cut bulk at +50% aliquot rise, cold-retard at 38°F overnight, and steam-bake in heavy cast iron at 450°F.
Key Baker's Math Questions (Strict True Hydration Water: 324g)
Why is salt 11g instead of 10g for 500g flour at 68%?
True 2.0% salinity counts the 50g flour inside your 100g starter (500g + 50g = 550g total flour × 2% = 11g salt), stabilizing the 935g loaf at 68.0% (68%).
Why does unadjusted 340g water cause a +2.9% surge on 500g flour at 68%?
Because 68% is below 100% starter hydration, 100g starter (50gW / 50gF) raises 340g water to 390g over 550g flour (70.9%). Cutting 16g to 324g locks 68.0%.
How does changing starter from 20% (100g) to 15% (75g) affect 500g flour at 68%?
Dropping starter from 100g to 75g on 500g flour reduces hidden starter water from 50g to 38g, raising required main water from 324g to 328g for 68%.