Converting High-Yeast 14g (2 Packets) Active Dry Yeast to Sourdough Levain in 400g Flour
High-inoculation conversion math comparing 160g direct yeast equivalency vs. 80g (20% baker's math) for 400g flour recipes.
If your goal is simply a sourdough version of a 400g recipe that used 14 grams of Active Dry Yeast, the simplest path is 20% inoculation: 80g of ripe levain, with 40g flour and 40g water removed from the main mix, leaving 360g and 240g. Expect 4.0 – 5.5 hours at 76°F (24°C) instead of a two-hour rise.
- Direct Yeast Equivalent
- 160g StarterDeduct 80g flour & 80g water
- 20% Artisan Inoculation
- 80g StarterDeduct 40g flour & 40g water
- Adjusted Main Flour/Water
- 360g / 240gPreserves 400g 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
Hidden Flour & Water Inside the Levain (14g Active Dry Yeast → 400g 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 |
|---|---|---|---|---|
| [Anchor]: 1000g / 50% | hidden 106.7g F + 53.3g W | → 893.3g / 646.7g | hidden 133.3g F + 66.7g W | → 866.7g / 633.3g |
| One Step Down: 400g / 100% | hidden 80g F + 80g W | → 320g / 200g | hidden 40g F + 40g W | → 360g / 240g |
| One Step Up: 400g / 125% | hidden 71.1g F + 88.9g W | → 328.9g / 191.1g | hidden 35.6g F + 44.4g W | → 364.4g / 235.6g |
| Two Steps Down: 500g / 75% | hidden 91.4g F + 68.6g W | → 408.6g / 281.4g | hidden 57.1g F + 42.9g W | → 442.9g / 307.1g |
| Two Steps Up: 400g / 100% | hidden 80g F + 80g W | → 320g / 200g | hidden 40g F + 40g W | → 360g / 240g |
Interactive Yeast ↔ Sourdough Conversion Calculator
Compare your exact mixing bowl dimensions, flour protein percentage, or discard weight in real time.
Balancing Osmotic Stress & Hydration When Replacing 14g Active Dry Yeast in 400g Flour
The conversion factor between active dry commercial yeast and levain is fixed by the packet anchor rather than by the flour. 14g of dry commercial yeast normalises to 160g of starter, and the 80g of flour and 80g of water inside it must be taken back out of the 400g base before the true hydration holds.
Direct packet scaling of 14g (2 Packets) Active Dry Yeast maps to 160g starter (-80g flour / -80g water), while artisan baker's math standardises inoculation at 20% of 400g (80g starter, leaving 360g main flour and 240g liquid).
3-Step Conversion Checklist (14g Active Dry Yeast → Sourdough in 400g Flour)
- Prepare the Levain Ahead: Build 80g of ripe 100% hydration starter and feed it early enough that it domes before you mix the 400g dough.
- Mix Flour and Liquid (360g + 240g): Combine the adjusted flour and liquid, reserving 10% of the water for the salt.
- Add Starter and Salt: Work in 80g of levain plus 2% salt, then perform 4 sets of stretch and coil folds at 30-minute intervals.
- Bulk to +50% and Shape: Let the 400g batch rise to the target aliquot volume, preshape, bench rest 20 minutes, and shape before a long cold retard.
Frequently Asked Questions for This Yeast ↔ Sourdough Conversion Spec
Does converting to sourdough change the dough weight?
Yes, slightly. The 400g grain and 280g liquid original carried 14g of dry yeast; the levain version carries 160g of starter instead, so expect a small shift in finished loaf weight.
How much flour and water do I subtract when adding 80g starter to 400g flour?
At 100% starter hydration, subtract 40g flour and 40g water/milk from your 400g flour recipe (leaving 360g flour and 240g liquid).
What happens to my hydration when I swap 14g active dry yeast for levain?
Nothing, if you deduct correctly. 160g of levain carries 80g flour and 80g water, so removing both keeps the 400g dough at 70% true hydration.