Convert 7g (1 Packet / 2¼ tsp) Active Dry Yeast to Sourdough Starter (1000g Flour Recipe)
Zero-drift flour and liquid deduction math for converting 7g of active dry yeast into 50%–125% hydration sourdough levain on a 1000g base.
To replace 7g of Active Dry Yeast in a 1000g flour recipe (at 70% hydration / 700g liquid), use either: (1) Direct yeast equivalency (80g of 100% culture, deducting 40g flour and 40g liquid to leave 960g flour and 660g water); or (2) Standard 20% artisan inoculation (200g culture, leaving 900g flour and 600g water at 70% True Hydration).
- Direct Yeast Equivalent
- 80g StarterDeduct 40g flour & 40g 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 7g Active Dry Yeast
Exact starter weights and main dough flour/water deductions for 7g Active Dry Yeast in 1000g flour so True Total Hydration never drifts.
| Starter Water Ratio | Starter Weight & Hidden Flour/Water | Corrected Flour / Corrected Liquid | 20% Inoculation Weight | Corrected Flour / Corrected Liquid |
|---|---|---|---|---|
| Case 500g @ 75% [Baseline] | 80g levain | subtract 45.7g flour, 34.3g water | 100g levain | subtract 57.1g flour, 42.9g water |
| Case 1000g @ 100% Stiffer Starter | 80g levain | subtract 40g flour, 40g water | 200g levain | subtract 100g flour, 100g water |
| Case 400g @ 125% Wetter Starter | 80g levain | subtract 35.6g flour, 44.4g water | 80g levain | subtract 35.6g flour, 44.4g water |
| Case 1000g @ 50% Lighter Starter | 80g levain | subtract 53.3g flour, 26.7g water | 200g levain | subtract 133.3g flour, 66.7g water |
| Case 1000g @ 100% Heavier Starter | 80g levain | subtract 40g flour, 40g water | 200g levain | subtract 100g flour, 100g water |
Real-Time Dough & Starter Scaling Sandbox
Scale this Convert 7g (1 Packet / 2¼ tsp) Activ specification up or down on your digital scale with zero hydration drift.
Why 7g Active Dry Yeast Cannot Be Swapped in 1000g Flour Without Deducting Starter Water
Scaling the conversion is linear in the flour but not in the yeast. Doubling a 1000g base to 2000g while keeping 7g of Active Dry Yeast halves the effective inoculation, so 80g of sourdough culture is a far gentler ferment than 160g would be.
Judge the conversion on the dough, not on the scale. The dough should feel the same slackness it had with the original 7g of active dry yeast, dome predictably, and hold its shape at shaping. If it is spreading, the 40g of hidden starter water was not deducted.
3-Step Conversion Checklist (7g 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.
Diagnostic Answers: Convert 7g (1 Packet / 2¼ tsp) Active Dry Ye
Why does my converted 1000g dough feel stickier than the original?
Almost always the 40g of hidden starter water was not deducted. Correct the liquid to 660g and the dough will tighten immediately.
Does converting to sourdough change the dough weight?
Yes, slightly. The 1000g flour and 700g liquid original carried 7g of dry commercial yeast; the levain version carries 80g of starter instead, so expect a small shift in finished loaf weight.
Should I use 80g or 200g of starter?
Use 80g if you want to preserve the exact leavening power of 7g active dry yeast. Use 200g if you want standard 20% artisan inoculation regardless of the original yeast weight.