Converting High-Yeast 14g (2 Packets) Fresh Cake Yeast to Sourdough Levain in 1000g Flour
High-inoculation conversion math comparing 66.7g direct yeast equivalency vs. 200g (20% baker's math) for 1000g flour recipes.
Swapping 14 grams (2 Packets) Fresh Cake Yeast into sourdough on a 1000g flour + 700g liquid formula yields 200g active levain at 20% baker's math (subtracting 100g flour and 100g water for 900g F / 600g W), or 66.7g by direct packet scaling (-33.3g F / -33.3g W).
- Direct Yeast Equivalent
- 66.7g StarterDeduct 33.3g flour & 33.3g 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
Replacing 14g Fresh Cake Yeast in 1000g Flour Across 50% to 125% Starter Hydrations
Exact starter weights and main dough flour/water deductions for 14g Fresh Cake Yeast in 1000g flour so True Total Hydration never drifts.
| Levain Hydration % | Packet Mode Starter & Deductions | Packet Mode Main Mix | 20% Mode Starter & Deductions | 20% Mode Main Mix |
|---|---|---|---|---|
| [Baseline]: 1000g / 100% | hidden 33.3g F + 33.3g W | → 966.7g / 666.7g | hidden 100g F + 100g W | → 900g / 600g |
| Stiffer Starter: 400g / 125% | hidden 29.6g F + 37g W | → 370.4g / 243g | hidden 35.6g F + 44.4g W | → 364.4g / 235.6g |
| Wetter Starter: 500g / 50% | hidden 44.4g F + 22.2g W | → 455.6g / 327.8g | hidden 66.7g F + 33.3g W | → 433.3g / 316.7g |
| Lighter Starter: 1000g / 100% | hidden 33.3g F + 33.3g W | → 966.7g / 666.7g | hidden 100g F + 100g W | → 900g / 600g |
| Heavier Starter: 1000g / 75% | hidden 38.1g F + 28.6g W | → 961.9g / 671.4g | hidden 114.3g F + 85.7g W | → 885.7g / 614.3g |
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 Fresh Cake Yeast in 1000g Flour
Flour mass moves too, and bakers tend to forget it. The 33.3g of pre-fermented flour inside 66.7g of sourdough culture means the true total flour of your dough is not 1000g but 1033.3g once the starter is added, which is what makes 70% the correct target rather than the naive 70%.
Temperature expectations change too. Because a 1000g levain dough ferments more slowly, the bulk window shifts, and bakers who keep the old 76°F target often find their 200g starter version over-proofing in a warm kitchen where the commercial version never had time to over-proof.
3-Step Conversion Checklist (14g Fresh Cake Yeast → Sourdough in 1000g Flour)
- Scale the Recipe Sheet: Rewrite the original 1000g, 700g, 14g fresh cake commercial 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.
Frequently Asked Questions for This Yeast ↔ Sourdough Conversion Spec
How much longer does sourdough take to rise than 14 g of Fresh Cake Yeast?
Expect bulk fermentation on a 1000g flour batch to take 4.0 – 5.5 hours at 76°F (24°C), roughly 3 to 4 times longer than commercial fresh cake yeast.
Why does my converted 1000g dough feel stickier than the original?
Almost always the 33.3g of hidden starter water was not deducted. Correct the liquid to 666.7g and the dough will tighten immediately.
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).