Convert 6g (2 tsp) Active Dry Yeast to Sourdough Starter (500g Flour Recipe)
Zero-drift flour and liquid deduction math for converting 6g of active dry yeast into 50%–125% hydration sourdough levain on a 500g base.
There are two defensible answers to this conversion, and the difference matters. Packet-equivalency treats 6g of Active Dry Yeast as a fixed quantity of leavening power, so you need 68.6g of ripe starter and must remove 34.3g flour plus 34.3g water from the 500g base. Baker's math instead standardises on 20% inoculation, giving 100g of starter on the same 500g flour with 450g flour and 300g liquid left in the bowl.
- Direct Yeast Equivalent
- 68.6g StarterDeduct 34.3g flour & 34.3g water
- 20% Artisan Inoculation
- 100g StarterDeduct 50g flour & 50g water
- Adjusted Main Flour/Water
- 450g / 300gPreserves 500g 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 Active Dry Yeast in 500g Flour Across 50% to 125% Starter Hydrations
Exact starter weights and main dough flour/water deductions for 6g Active Dry Yeast in 500g 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 |
|---|---|---|---|---|
| 75% starter on 1000g [Anchor] | packet mode 68.6g | main 960.8g / 670.6g | 20% mode 200g | main 885.7g / 614.3g |
| 100% starter on 400g One Step Down | packet mode 68.6g | main 365.7g / 245.7g | 20% mode 80g | main 360g / 240g |
| 125% starter on 500g One Step Up | packet mode 68.6g | main 469.5g / 311.9g | 20% mode 100g | main 455.6g / 294.4g |
| 50% starter on 500g Two Steps Down | packet mode 68.6g | main 454.3g / 327.1g | 20% mode 100g | main 433.3g / 316.7g |
| 100% starter on 500g Two Steps Up | packet mode 68.6g | main 465.7g / 315.7g | 20% mode 100g | main 450g / 300g |
Dynamic Stoichiometric Workbench (68.6g Starter)
Test custom loaf weights or alternative fermentation schedules directly against the 100g Starter benchmark above.
Why 6g Active Dry Yeast Cannot Be Swapped in 500g Flour Without Deducting Starter Water
Because active dry yeast is a pure monoculture of Saccharomyces cerevisiae, transitioning your 500g batch to sourdough requires tracking volumetric aliquot rise (+50%) over 4.0 – 5.5 hours at 76°F (24°C) rather than watching a 60-minute clock.
Temperature expectations change too. Because a 500g levain dough ferments more slowly, the bulk window shifts, and bakers who keep the old 76°F target often find their 100g starter version over-proofing in a warm kitchen where the commercial version never had time to over-proof.
3-Step Conversion Checklist (6g Active Dry Yeast → Sourdough in 500g Flour)
- Weigh Active Levain (100g or 68.6g): Measure 100g peaked 100% starter for 20% inoculation, or 68.6g for direct 6g Active Dry Yeast equivalency.
- Deduct Main Flour & Liquid (500g Base): Scale main flour to 450g (-50g) and liquid to 300g (-50g).
- Ferment for 4.0 – 5.5 hours at 76°F (24°C): Hold the 500g dough at 75°F–78°F until +50% volumetric expansion before shaping and cold proofing.
- Retard and Bake: Cold-proof the shaped dough for 12–16 hours at 38°F, then bake covered and uncover to a deep mahogany crust.
Key Baker's Math Questions (Direct Yeast Equivalent: 68.6g Starter)
Should I use 68.6 grams or 100g of starter?
Use 68.6 grams if you want to preserve the exact leavening power of 6 grams active dry yeast. Use 100g if you want standard 20% artisan inoculation regardless of the original yeast weight.
Can I use a 50% hydration levain when converting 6g of Active Dry Yeast?
Yes, but the deduction changes: 68.6g at 50% hydration holds 46g flour and 23g water, so deduct those two figures instead.
How do I convert a sweet or enriched recipe with 6g of Active Dry Yeast?
The flour and water deduction is identical, but reduce the sugar by about 10%–15%, because the 4.0 – 5.5 hours at 76°F (24°C) sourdough ferment converts more of it than a two-hour commercial rise.