Convert 6g (2 tsp) Fresh Cake Yeast to Sourdough Starter (1000g Flour Recipe)
Zero-drift flour and liquid deduction math for converting 6g of fresh cake yeast into 50%–125% hydration sourdough levain on a 1000g base.
None of the arithmetic changes with the yeast brand, but the type does: fresh cake yeast carries its own potency per gram, so 6 grams of it converts to 28.6 grams of starter rather than the 200g that 20% baker's math prescribes. Either way, deduct the hidden flour and water — 14.3g and 14.3g in packet mode — or the 1000g dough will not hold 70% hydration.
- Direct Yeast Equivalent
- 28.6g StarterDeduct 14.3g flour & 14.3g 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 6g Fresh Cake Yeast in 1000g Flour Across 50% to 125% Starter Hydrations
Every figure is derived from the 1000g flour / 700g liquid base formula and the 6g fresh cake yeast dose.
| Levain Hydration % | Packet Mode Starter & Deductions | Packet Mode Main Mix | 20% Mode Starter & Deductions | 20% Mode Main Mix |
|---|---|---|---|---|
| 100% starter on 1000g [Baseline] | packet mode 28.6g | main 985.7g / 685.7g | 20% mode 200g | main 900g / 600g |
| 125% starter on 400g Stiffer Starter | packet mode 28.6g | main 387.3g / 264.1g | 20% mode 80g | main 364.4g / 235.6g |
| 50% starter on 1000g Wetter Starter | packet mode 28.6g | main 981g / 690.5g | 20% mode 200g | main 866.7g / 633.3g |
| 100% starter on 500g Lighter Starter | packet mode 28.6g | main 485.7g / 335.7g | 20% mode 100g | main 450g / 300g |
| 75% starter on 1000g Heavier Starter | packet mode 28.6g | main 983.7g / 687.8g | 20% mode 200g | main 885.7g / 614.3g |
Real-Time Dough & Starter Scaling Sandbox
Scale this Convert 6g (2 tsp) Fresh Cake Yeast specification up or down on your digital scale with zero hydration drift.
Why 6g Fresh Cake Yeast Cannot Be Swapped in 1000g Flour Without Deducting Starter Water
The conversion factor between fresh cake yeast and sourdough culture is fixed by the packet anchor rather than by the flour. 6g of dry yeast normalises to 28.6g of starter, and the 14.3g of flour and 14.3g of water inside it must be taken back out of the 1000g base before the true hydration holds.
Keep a log. The most useful column is not the starter weight but the total elapsed time from mixing to shaping, because on the second and third bake the 1000g formula with 28.6g of sourdough culture is a different dough to the one you remember.
3-Step Conversion Checklist (6g Fresh Cake Yeast → Sourdough in 1000g Flour)
- Scale the Recipe Sheet: Rewrite the original 1000g, 700g, 6g fresh cake 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.
Diagnostic Answers: Convert 6g (2 tsp) Fresh Cake Yeast to Sourd
What happens to my hydration when I swap 6g fresh cake yeast for levain?
Nothing, if you deduct correctly. 28.6g of levain carries 14.3g grain and 14.3g water, so removing both keeps the 1000g dough at 70% true hydration.
Does converting to sourdough change the dough weight?
Yes, slightly. The 1000g flour and 700g liquid original carried 6g of dry commercial yeast; the levain version carries 28.6g of starter instead, so expect a small shift in finished loaf weight.
What salt level should I use on the converted 1000g dough?
Keep 2% of the total system flour, which on a 1000g base with 100g of starter flour is about 22g of salt.