Converting High-Yeast 10g (1½ Packets) Instant Dry Yeast to Sourdough Levain in 1000g Flour
High-inoculation conversion math comparing 142.9g 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 10 grams (1½ Packets) instant dry yeast: 142.9g of ripe 100% hydration starter, deducted from the main mix as 71.4g flour and 71.4g water, giving 928.6g and 628.6g. Standard 20% baker's math on the same 1000g base wants 200g of starter and 900g / 600g.
- Direct Yeast Equivalent
- 142.9g StarterDeduct 71.4g flour & 71.4g 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 â 5.5 hoursAt 76°F (24°C) vs. 1â1.5 hrs for commercial yeast
Hidden Flour & Water Inside the Levain (10g Instant Dry Yeast â 1000g dough)
Rows recompute the full conversion independently, so the flour, liquid and starter columns always reconcile.
| Hydration of Levain | Yeast-Equivalent Starter | Remaining Main Formula | Baker's-Math Starter | Remaining Main Formula |
|---|---|---|---|---|
| 400g flour @ 100% [Your Formula] | 142.9g starter (71.4g F / 71.4g W) | 328.6g F / 208.6g W | 80g starter (40g F / 40g W) | 360g F / 240g W |
| 1000g flour @ 50% Leaner Dough | 142.9g starter (95.2g F / 47.6g W) | 904.8g F / 652.4g W | 200g starter (133.3g F / 66.7g W) | 866.7g F / 633.3g W |
| 500g flour @ 75% Wetter Dough | 142.9g starter (81.6g F / 61.2g W) | 418.4g F / 288.8g W | 100g starter (57.1g F / 42.9g W) | 442.9g F / 307.1g W |
| 1000g flour @ 125% Tighter Dough | 142.9g starter (63.5g F / 79.4g W) | 936.5g F / 620.6g W | 200g starter (88.9g F / 111.1g W) | 911.1g F / 588.9g W |
| 1000g flour @ 100% Looser Dough | 142.9g starter (71.4g F / 71.4g W) | 928.6g F / 628.6g W | 200g starter (100g F / 100g W) | 900g F / 600g W |
Interactive Yeast â Sourdough Conversion Calculator
Compare your exact mixing bowl dimensions, flour protein percentage, or discard weight in real time.
Balancing Osmotic Stress & Hydration When Replacing 10g Instant Dry Yeast in 1000g Flour
Commercial instant dry yeast (10 g) 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.
Rye and whole wheat behave differently under conversion. Their weaker gluten absorbs the 71.4g of hidden starter water more readily, so a 1000g rye formula converts with less structural penalty than a refined wheat one at the same 70% hydration.
3-Step Conversion Checklist (10g Instant Dry Yeast â Sourdough in 1000g Flour)
- Weigh Active Levain (200g or 142.9g): Measure 200g peaked 100% starter for 20% inoculation, or 142.9g for direct 10 g Instant Dry Yeast equivalency.
- Deduct Main Flour & Liquid (1000g Base): Scale main flour to 900g (-100g) and liquid to 600g (-100g).
- Ferment for 4.0 â 5.5 hours at 76°F (24°C): Hold the 1000g dough at 75°Fâ78°F until +50% volumetric expansion before shaping and cold proofing.
- Retard and Bake: Cold-proof the shaped dough for 12â16 hours at 38°F, then bake covered and uncover to a deep mahogany crust.
Frequently Asked Questions for This Yeast â Sourdough Conversion Spec
How much flour and water do I subtract when adding 200g culture to 1000g flour?
At 100% culture hydration, subtract 100g flour and 100g water/milk from your 1000g flour recipe (leaving 900g flour and 600g liquid).
How much sourdough starter replaces 10 g of Instant Dry Yeast in 1000g flour?
By direct yeast weight equivalency, 10 g of Instant Dry Yeast equals 142.9g 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 24â48 hours.