Replacing 60g High-Hydration (125%) Sourdough Starter with Instant or Active Dry Yeast
Liquid-heavy starter reverse conversion: adding back +33.3g water and +26.7g flour when swapping 60g (125%) starter for yeast.
A 125% hydration starter is roughly 44% flour and 56% water by weight, so 60g of it hides 26.7g of flour and 33.3g of water. Deleting it without restoring both shrinks the loaf and skews the ratio away from 73.1%. Restoring them and dosing 6.7g of yeast keeps the dough identical.
- Add Back Flour
- +26.7gReplaces flour inside 60g (125%) starter
- Add Back Water
- +33.3gReplaces water inside 60g (125%) starter
- Instant Yeast (2-Hr Rise)
- 6.7g (2.2 tsp)For 476.7g total flour batch
- Preserved Hydration
- 73.1%348.3g W / 476.7g F
Gram Weights for Replacing 60g of 125% Hydration Starter
The three yeast formats differ in potency per gram, which is why the Instant column is the baseline the other two are scaled from.
| Target Rise Schedule | IDY Dose | ADY Dose | Fresh Cake Dose | Restoration Required |
|---|---|---|---|---|
| 80g 125% starter — Standard Same-Day (1.5–2 hrs) [Baseline] | use 6.8g instant | use 8.5g active dry | use 20.4g fresh | add 35.6g flour + 44.4g water |
| 60g 125% starter — Slow Artisan Bulk (3.5–4.5 hrs) Smaller Batch | use 3.3g instant | use 4.2g active dry | use 10g fresh | add 26.7g flour + 33.3g water |
| 40g 125% starter — Overnight No-Knead / Cold Proof (12–18 hrs) Larger Batch | use 1.2g instant | use 1.5g active dry | use 3.5g fresh | add 17.8g flour + 22.2g water |
| 70g 125% starter — Standard Same-Day (1.5–2 hrs) Half Size | use 6.7g instant | use 8.4g active dry | use 20.2g fresh | add 31.1g flour + 38.9g water |
| 50g 125% starter — Slow Artisan Bulk (3.5–4.5 hrs) Double Size | use 3.3g instant | use 4.1g active dry | use 9.9g fresh | add 22.2g flour + 27.8g water |
Custom Batch Recalculation Engine
Fine-tune starter hydration between 50% stiff and 125% liquid while keeping your sourdough → yeast reverse conversion ratios locked.
Why 60g of 125% High-Hydration Starter Requires Asymmetric Water Restoration
A cold overnight ferment changes the yeast arithmetic entirely. The 6.7g that produces a 1.5 – 2.0 hours warm bulk rise would be a violent over-proof at 39°F (4°C), so the overnight schedule needs roughly a fifth of the instant-yeast dose for the same 476.7g of flour.
Scaling is straightforward but not uniform. Doubling the flour doubles the yeast linearly, while the 26.7g of restored flour and 33.3g of restored water simply stay in the main mix and are no longer a separate line item.
Step-by-Step Reverse Conversion Protocol (60g @ 125%)
- Restore Base Ingredients (+26.7g F / +33.3g W): Add 26.7g flour and 33.3g water to your main dough (476.7g F / 348.3g W).
- Select Yeast Inoculation by Schedule: Weigh 6.7g (2.2 tsp) Instant Yeast for a 90–120 min rise, or scale down for a 4-hour artisan bulk.
- Mix & Proof Directly: Combine all 476.7g flour, 348.3g water, yeast, and salt without a pre-ferment build.
- Bake on Schedule: Shape once, proof for the remaining time, and bake the moment the dough has doubled rather than waiting for the slow souring a levain would deliver.
Technical Q&A: Replacing 60g High-Hydration (125%) Sourdough St
Does the converted batch keep the same batch weight?
Almost — the 60g of starter is replaced by the 6.7g of yeast plus the 26.7g of flour and 33.3g of water you put back, which is a slightly different total.
How much flour and water are inside 60g of 125% hydration levain?
60g of 125% hydration sourdough levain contains 26.7g flour and 33.3g water.
Does converting to yeast change the fermentation time?
Dramatically. A levain dough on this 476.7g base would need many hours; the 6.7g of commercial yeast gives you a 1.5 – 2.0 hours warm bulk rise.