Convert 6g (2 tsp) Instant Dry Yeast to Sourdough Starter (1000g Flour Recipe)
Zero-drift flour and liquid deduction math for converting 6g of instant dry yeast into 50%–125% hydration sourdough levain on a 1000g base.
If your goal is simply a sourdough version of a 1000g recipe that used 6g of Instant Dry Yeast, the simplest path is 20% inoculation: 200g of ripe levain, with 100g flour and 100g water removed from the main mix, leaving 900g and 600g. Expect 4.0 – 5.5 hours at 76°F (24°C) instead of a two-hour rise.
- Direct Yeast Equivalent
- 85.7g StarterDeduct 42.9g flour & 42.9g 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
Starter Deduction Grid for 6g (2 tsp) Instant Dry Yeast in 1000g Flour
Every figure is derived from the 1000g flour / 700g liquid base formula and the 6g instant dry yeast dose.
| Starter Hydration Level | Levain Required by Yeast Weight | Flour & Liquid Left in the Bowl | Levain Required at 20% Inoculation | Corrected Main Mix |
|---|---|---|---|---|
| [Baseline]: 400g / 50% | hidden 57.1g F + 28.6g W | → 342.9g / 251.4g | hidden 53.3g F + 26.7g W | → 346.7g / 253.3g |
| Stiffer Starter: 1000g / 100% | hidden 42.9g F + 42.9g W | → 957.1g / 657.1g | hidden 100g F + 100g W | → 900g / 600g |
| Wetter Starter: 500g / 125% | hidden 38.1g F + 47.6g W | → 461.9g / 302.4g | hidden 44.4g F + 55.6g W | → 455.6g / 294.4g |
| Lighter Starter: 1000g / 75% | hidden 49g F + 36.7g W | → 951g / 663.3g | hidden 114.3g F + 85.7g W | → 885.7g / 614.3g |
| Heavier Starter: 1000g / 100% | hidden 42.9g F + 42.9g W | → 957.1g / 657.1g | hidden 100g F + 100g W | → 900g / 600g |
Live Parameter Solver for Convert 6g (2 tsp) Instant Dry Yeast to So
Dial in custom baker's percentages and export your adjusted 85.7g Starter formula for bake day.
Why 6g Instant Dry Yeast Cannot Be Swapped in 1000g Flour Without Deducting Starter Water
Water is the silent variable in this swap. 6g of instant dry yeast brings essentially no water with it, but 85.7g of levain brings 42.9g. Add that to 700g without deducting it and the 1000g dough lands well above 70% hydration and spreads.
Rye and whole wheat behave differently under conversion. Their weaker gluten absorbs the 42.9g 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 (6g Instant Dry Yeast → Sourdough in 1000g Flour)
- Weigh Active Levain (200g or 85.7g): Measure 200g peaked 100% starter for 20% inoculation, or 85.7g for direct 6g 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 – 5.5 hours at 76°F (24°C): Hold the 1000g 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.
Cereal Chemistry & Bench Execution FAQs
Can I convert a 1000g dough that already contains a preferment or poolish?
Yes, but dissolve the preferment's commercial yeast into the main mix first so the full 6g of leavening power is counted. Then deduct 42.9g flour and 42.9g water for the levain you are adding.
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).
Does converting to sourdough change the dough weight?
Yes, slightly. The 1000g flour and 700g liquid original carried 6 g of dry yeast; the levain version carries 85.7g of starter instead, so expect a small shift in finished loaf weight.