Exact 70% Sourdough Ratio for 750g Flour: 503g Water vs 525g Apparent (2-Loaf Batch)
Baker's math for 750g flour at 70% (1420g dough, 2-loaf batch): 503g corrected water vs 72.7% drift.
Scaling a 750g sourdough build to 70% with 150g 1:1:1 levain means an unadjusted 525g water pour drifts to 72.7% (+2.7% excess) from 75g hidden liquid and 75g fermented flour. Weighing 503g main water (-22g offset) plus 16.5g sea salt locks True Total Hydration at 70.06% (target 70%) across a 1420g loaf.
- Strict True Hydration Water
- 503gLocks True Total Hydration at 70.06% (target 70%, -22g)
- Unadjusted Apparent Water
- 525gPushes True Hydration to 72.7% (+2.7% surge)
- 20% Active Starter & Salt
- 150g / 16.5g75g hidden flour + 75g hidden water
- Stickiness & Rheology
- 2 / 5 StarsBeginner Friendly (Balanced extensibility)
750g Flour at 70% Hydration: 2D Scale & Starter Sensitivity Matrix
Neighborhood sensitivity across 750g ± 50g flour and 70% ± 2% hydration (150g starter, 16.5g salt, 1420g dough).
| Batch & Seed Spec | Flour Breakdown | Levain Split | Corrected Water (70% Ref) | Salt & Dough Mass | Apparent vs Locked |
|---|---|---|---|---|---|
| 700g @ 68% (15% Seed) Compact Mix (-50g) | 700g + 53g = 753g (70%/750g ref) | 105g (53gF/52gW @ 100%) | 460g W (vs 476g app @ R1) | 15.1g salt (1265g dough) | 70.1% drift → 67.99% (68% goal) |
| 750g @ 68% (18% Seed) Conservative Pour | 750g + 75g = 825g (70%/750g ref) | 135g (75gF/60gW @ 80%) | 501g W (vs 510g app @ R2) | 16.5g salt (1386g dough) | 69.1% drift → 68.0% (68% goal) |
| 750g @ 70% (20% Seed) [Locked Benchmark] | 750g + 75g = 825g (70%/750g ref) | 150g (75gF/75gW @ 100%) | 503g W (vs 525g app @ R3) | 16.5g salt (1403g dough) | 72.7% drift → 70.06% (70% goal) |
| 750g @ 72% (22% Seed) Open-Crumb Push | 750g + 83g = 833g (70%/750g ref) | 165g (83gF/82gW @ 100%) | 518g W (vs 540g app @ R4) | 16.7g salt (1433g dough) | 74.7% drift → 72.03% (72% goal) |
| 800g @ 72% (25% Seed) Expanded Loaf (+50g) | 800g + 89g = 889g (70%/750g ref) | 200g (89gF/111gW @ 125%) | 529g W (vs 576g app @ R5) | 17.8g salt (1529g dough) | 77.3% drift → 71.99% (72% goal) |
Dynamic Stoichiometric Workbench (503g)
Test custom loaf weights or alternative fermentation schedules directly against the 525g benchmark above.
True 70.06% vs 72.7% Apparent Hydration on 750g Flour (150g Starter)
Flour-water coupling on 750g base grain changes once 150g liquid levain (75g F / 75g W) enters the mixer: 525g main water creates 600g total water (72.7%, +2.7% overshoot). Scaling back 22g to 503g water over 825g total flour locks True Total Hydration at 70.06% (target 70%).
Capillary water binding across 825g total flour (750g + 75g) at 70.06% (70% target) leaves a 2/5 stickiness profile with balanced extensibility. Subtracting 22g water (503g vs 525g) and dosing 16.5g salt locks vertical oven spring in the 1420g loaf.
Double-Hydration (453g + 50g) Mixing Steps on 750g Flour
- Enzymatic Rest (750g Flour + 453g Water): Blend 453g water into 750g flour (holding back 50g of 503g) for 45 min.
- True-70% Calibration (-22g Deduction): Incorporate 150g starter, 16.5g sea salt, and 50g water to yield 1420g dough at 70.06% (vs 72.7%).
- Tension Alignment (825g System Flour): Perform 4 damp-hand coil folds every 30 min tailored to 2/5 stickiness and balanced elasticity.
- Overnight Retard & Cast-Iron Bake (2-Loaf Batch): Terminate bulk at +50% rise, cold-proof at 38°F, score deeply, and bake at 450°F.
Key Baker's Math Questions (Strict True Hydration Water: 503g)
How does 453g autolyse water improve a 750g loaf at 70%?
Soaking 750g flour in 453g water for 45 minutes before adding 150g acidic starter, 16.5g salt, and 50g water (503g total) builds balanced elasticity across the 1420g dough.
Is 70% hydration too wet for 750g of bread flour?
At 70% (503g water on 750g flour, 1420g dough), the 70.06% formula sits comfortably inside standard 11.7%–12.7% protein flour limits (2/5 tack).
Why does 525g water make my 750g flour dough feel like 72.7%?
Your 150g of 100% starter adds 75g water and 75g flour, turning 525g water into 600g water over 825g flour (72.7%). Dropping 22g to 503g locks True Total Hydration at 70.06% (target 70%).