How to Replace 3g (1 tsp) Active Dry Yeast with Sourdough Starter in a 1000g Flour Recipe
Zero-drift flour and water deduction guide for converting low-yeast (3g active dry yeast) artisan or poolish doughs into 200g sourdough levain.
Converting 1000g flour and 700g water from 3g Active Dry Yeast to 100% hydration levain requires deducting starter mass so 70% True Total Hydration holds steady: weigh 200g starter with 900g main flour and 600g liquid (20% mode) or 34.3g starter with 982.9g flour and 682.9g liquid (packet mode).
- Direct Yeast Equivalent
- 34.3g StarterDeduct 17.1g flour & 17.1g 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
Gram Weights for 1000g Flour Sourdough Built from 3g Active Dry Yeast
Every figure is derived from the 1000g flour / 700g liquid base formula and the 3g active dry yeast dose.
| Starter Water Ratio | Starter Weight & Hidden Flour/Water | Corrected Flour / Corrected Liquid | 20% Inoculation Weight | Corrected Flour / Corrected Liquid |
|---|---|---|---|---|
| 1000g flour @ 50% [Primary] | 34.3g starter (22.9g F / 11.4g W) | 977.1g F / 688.6g W | 200g starter (133.3g F / 66.7g W) | 866.7g F / 633.3g W |
| 400g flour @ 100% Low Hydration | 34.3g starter (17.1g F / 17.1g W) | 382.9g F / 262.9g W | 80g starter (40g F / 40g W) | 360g F / 240g W |
| 1000g flour @ 125% Mid Hydration | 34.3g starter (15.2g F / 19g W) | 984.8g F / 681g W | 200g starter (88.9g F / 111.1g W) | 911.1g F / 588.9g W |
| 500g flour @ 75% High Hydration | 34.3g starter (19.6g F / 14.7g W) | 480.4g F / 335.3g W | 100g starter (57.1g F / 42.9g W) | 442.9g F / 307.1g W |
| 1000g flour @ 100% Standard 100% | 34.3g starter (17.1g F / 17.1g W) | 982.9g F / 682.9g W | 200g starter (100g F / 100g W) | 900g F / 600g W |
Custom Batch Recalculation Engine
Fine-tune starter hydration between 50% stiff and 125% liquid while keeping your yeast ↔ sourdough conversion ratios locked.
Replacing Low-Inoculation 3g Active Dry Yeast in 1000g Flour Without Shifting Hydration
Salt interacts with the swap in a way that surprises people. Commercial yeast contributes no salt, while your levain was itself salted when it was last fed, so converting 3g of Active Dry Yeast on a 1000g base usually lets you shave a fraction of a gram off the salt line without the dough losing structure.
The dough weight of the converted batch is lower than the original. Removing 3 grams of active dry yeast and adding 34.3 grams of levain changes the total mass of a 1000g flour dough, which is why the finished loaf bakes slightly differently even though the flour and water balance is identical.
3-Step Conversion Checklist (3g Active Dry Yeast → Sourdough in 1000g Flour)
- Check the Starter Is Ripe: 200g of levain must be domed, bubbly and at full stretch; a flat starter slows the 4.0 – 5.5 hours at 76°F (24°C) window significantly.
- Combine 1000g of Flour with the Adjusted Liquid: Pour 600g, saving 10% to dissolve the salt later.
- Fold in 200g Starter and 2% Salt: Add the levain, pinch through the dough, and work in the salt water.
- Ferment to +50%: Judge by volume in a straight-sided jar, then shape, retard overnight and bake on a preheated stone or in a Dutch oven.
Technical Q&A: How to Replace 3g (1 tsp) Active Dry Yeast with
How much sourdough culture replaces 3g of Active Dry Yeast in 1000g flour?
By direct yeast weight equivalency, 3g of Active Dry Yeast equals 34.3g of 100% hydration sourdough culture. For a 1000g flour batch, the 20% baker's inoculation is 200g culture.
How do I convert a sweet or enriched recipe with 3 grams 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.
How much sourdough culture replaces 3g of Active Dry Yeast in 1000g flour?
By direct yeast weight equivalency, 3g of Active Dry Yeast equals 34.3g of 100% hydration sourdough culture. For a 1000g flour batch, the 20% baker's inoculation is 200g culture.