Converting High-Yeast 9g (1 tbsp / 3 tsp) Active Dry Yeast to Sourdough Levain in 1000g Flour
High-inoculation conversion math comparing 102.9g direct yeast equivalency vs. 200g (20% baker's math) for 1000g flour recipes.
Here is the conversion in one line for a 1000g flour and 700g liquid dough built with 9 g (1 tbsp / 3 tsp) active dry yeast: 102.9 g of ripe 100% hydration starter, deducted from the main mix as 51.4g flour and 51.4g water, giving 948.6g and 648.6g. Standard 20% baker's math on the same 1000g base wants 200g of starter and 900g / 600g.
- Direct Yeast Equivalent
- 102.9g StarterDeduct 51.4g flour & 51.4g 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: 9g 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) |
|---|---|---|---|---|
| [Your Formula]: 1000g / 125% | hidden 45.7g F + 57.1g W | → 954.3g / 642.9g | hidden 88.9g F + 111.1g W | → 911.1g / 588.9g |
| Leaner Dough: 400g / 75% | hidden 58.8g F + 44.1g W | → 341.2g / 235.9g | hidden 45.7g F + 34.3g W | → 354.3g / 245.7g |
| Wetter Dough: 500g / 100% | hidden 51.4g F + 51.4g W | → 448.6g / 298.6g | hidden 50g F + 50g W | → 450g / 300g |
| Tighter Dough: 1000g / 100% | hidden 51.4g F + 51.4g W | → 948.6g / 648.6g | hidden 100g F + 100g W | → 900g / 600g |
| Looser Dough: 1000g / 50% | hidden 68.6g F + 34.3g W | → 931.4g / 665.7g | hidden 133.3g F + 66.7g W | → 866.7g / 633.3g |
Real-Time Dough & Starter Scaling Sandbox
Scale this Replacing 9g (1 tbsp / 3 tsp) Active specification up or down on your digital scale with zero hydration drift.
Balancing Osmotic Stress & Hydration When Replacing 9g Active Dry Yeast in 1000g Flour
Commercial active dry yeast (9g) introduces negligible moisture to a 1000g flour mix, whereas 200g of 100% hydration levain carries 100g fermented flour and 100g water. Deducting those exact weights keeps the 1000g system at 70% hydration.
Direct packet scaling of 9g (1 tbsp / 3 tsp) Active Dry Yeast maps to 102.9g culture (-51.4g flour / -51.4g water), while artisan baker's math standardises inoculation at 20% of 1000g (200g culture, leaving 900g main flour and 600g liquid).
3-Step Conversion Checklist (9g Active Dry Yeast → Sourdough in 1000g Flour)
- Prepare the Levain Ahead: Build 200g of ripe 100% hydration starter and feed it early enough that it domes before you mix the 1000g dough.
- Mix Flour and Liquid (900g + 600g): Combine the adjusted flour and liquid, reserving 10% of the water for the salt.
- Add Starter and Salt: Work in 200g of sourdough culture plus 2% salt, then perform 4 sets of stretch and coil folds at 30-minute intervals.
- Bulk to +50% and Shape: Let the 1000g batch rise to the target aliquot volume, preshape, bench rest 20 minutes, and shape before a long cold retard.
Diagnostic Answers: Replacing 9g (1 tbsp / 3 tsp) Active Dry Yea
Can I convert a 1000g dough that already contains a preferment or poolish?
Yes, but dissolve the preferment's yeast into the main mix first so the full 9g of leavening power is counted. Then deduct 51.4g flour and 51.4g water for the levain you are adding.
Does the type of commercial yeast change the starter weight?
Yes. Active Dry Yeast has its own potency per gram, so 9 grams of it converts to 102.9 grams of levain rather than the 200g that the 20% rule would prescribe on a 1000g base.
How much flour and water do I subtract when adding 200g starter to 1000g flour?
At 100% starter hydration, subtract 100g flour and 100g water/milk from your 1000g flour recipe (leaving 900g flour and 600g liquid).