How to Replace 2g (⅔ tsp) Active Dry Yeast with Sourdough Starter in a 1000g Flour Recipe
Zero-drift flour and water deduction guide for converting low-yeast (2g active dry yeast) artisan or poolish doughs into 200g sourdough levain.
To replace 2g of Active Dry Yeast in a 1000g flour recipe (at 70% hydration / 700g liquid), use either: (1) Direct commercial yeast equivalency (22.9g of 100% starter, deducting 11.4g flour and 11.4g liquid to leave 988.6g flour and 688.6g water); or (2) Standard 20% artisan inoculation (200g starter, leaving 900g flour and 600g water at 70% True Hydration).
- Direct Yeast Equivalent
- 22.9g StarterDeduct 11.4g flour & 11.4g water
- 20% Artisan Inoculation
- 200g StarterDeduct 100g flour & 100g water
- Adjusted Main Flour/Water
- 900g / 600gPreserves 1000g total system flour at 20% levain
- Sourdough Bulk Window
- 4.0 – 5.5 hoursAt 76°F (24°C) vs. 1–1.5 hrs for commercial yeast
Yeast-to-Sourdough Conversion Table: 2g Active Dry Yeast on a 1000g Base
Use the 100% hydration row as your working formula unless your levain is deliberately stiff or liquid.
| Starter Hydration | Packet-Equivalent Starter (Deductions) | Adjusted Main Dough (Packet Mode) | 20% Artisan Starter (Deductions) | Adjusted Main Dough (20% Mode) |
|---|---|---|---|---|
| Case 400g @ 125% [Baseline] | 22.9g levain | subtract 10.2g flour, 12.7g water | 80g levain | subtract 35.6g flour, 44.4g water |
| Case 1000g @ 75% Stiffer Starter | 22.9g levain | subtract 13.1g flour, 9.8g water | 200g levain | subtract 114.3g flour, 85.7g water |
| Case 500g @ 100% Wetter Starter | 22.9g levain | subtract 11.4g flour, 11.4g water | 100g levain | subtract 50g flour, 50g water |
| Case 1000g @ 100% Lighter Starter | 22.9g levain | subtract 11.4g flour, 11.4g water | 200g levain | subtract 100g flour, 100g water |
| Case 1000g @ 50% Heavier Starter | 22.9g levain | subtract 15.2g flour, 7.6g water | 200g levain | subtract 133.3g flour, 66.7g water |
On-Bench Hydration & Fermentation Adjuster
Modify base flour mass, levain inoculation, or ambient kitchen temperature below to recalculate from this 22.9g Starter baseline.
Replacing Low-Inoculation 2g Active Dry Yeast in 1000g Flour Without Shifting Hydration
The conversion factor between active dry yeast and levain is fixed by the packet anchor rather than by the grain. 2g of dry yeast normalises to 22.9g of starter, and the 11.4g of grain and 11.4g of water inside it must be taken back out of the 1000g base before the true hydration holds.
If your original recipe used 2g of active dry commercial yeast for a sweet or enriched dough, the 22.9g levain version usually needs its sugar reduced slightly, because the longer fermentation converts more of it and the finished crumb sweetens on its own.
3-Step Conversion Checklist (2g Active Dry Yeast → Sourdough in 1000g Flour)
- Scale the Recipe Sheet: Rewrite the original 1000g, 700g, 2 g active dry yeast formula as 900g flour, 600g liquid, 200g levain and 2% salt.
- Hydrate the Flour: Mix the adjusted flour and 90% of the liquid and rest 45 minutes to fully hydrate the starch.
- Add Levain, Salt and the Last 10%: Work in 200g of starter, 2% salt and the reserved water, then complete the gluten with 3 coil folds.
- Ferment, Shape, Retard: Let the 1000g dough reach +50% volume, shape tightly, cold-proof 12–16 hours and bake at 450°F for a blistered crust.
Common Scaling & Troubleshooting Questions (22.9g Starter)
What salt level should I use on the converted 1000g dough?
Keep 2% of the total system grain, which on a 1000g base with 100g of starter grain is about 22g of salt.
How much sourdough starter replaces 2g of Active Dry Yeast in 1000g flour?
By direct commercial yeast weight equivalency, 2g of Active Dry Yeast equals 22.9g of 100% hydration sourdough starter. For a 1000g flour batch, the 20% baker's inoculation is 200g starter.
Is a 1000g sourdough conversion suitable for a pizza or focaccia base?
Yes, and long cold retarding is often an advantage for pizza. Mix 200g of levain into 900g flour and 600g water and refrigerate 24–48 hours.