How to Build 120g of 1:2:1 Stiff (50%) Sourdough Starter (30g Seed, 60g Flour, 30g Water)
Low-hydration stiff levain math (50% Stiff Lievito Madre) to build 120g of sweet, low-acidity starter for artisan bread or enriched dough.
The arithmetic of a 1:2:1 Stiff (50%) feeding is simple: 120g of starter divided by 4 parts gives 30.0g per part, so the seed is 30g, the fresh flour is 60g and the water is 30g. At 50% Stiff Lievito Madre this italian lievito madre / panettone low-acid stiff build build ripens in 6 - 8 hrs. If you keep a 20g jar remainder, feed 140g instead: 35g seed, 70g flour, 35g water — zero discard, permanently.
- Exact 120g Build
- 30g : 60g : 30gStarter : Flour : Water (1:2:1 Stiff (50%))
- 120g + 20g Jar Reserve
- 35g : 70g : 35gBuilds 140g total (0g discard waste)
- Estimated Peak Window
- 6 - 8 hrsAt 74°F–76°F (23.5°C–24.5°C)
- Levain Hydration
- 50%Italian Lievito Madre / Panettone low-acid stiff build
120g 1:2:1 Stiff (50%) Feeding Neighbourhood: Seed, Flour, Water & Peak Window
Neighbourhood of 1:2:1 Stiff (50%) builds used to sanity-check a scaled recipe before committing flour to the mixer.
| Levain Yield | Culture (1) | Feed Flour (2) | Feed Water (1) | Estimated Peak Window |
|---|---|---|---|---|
| 120g 1:2:1 Stiff (50%) ([Baseline]) | seed 30g | fresh flour 60g | room-temp water 30g | peak 6 - 8 hrs at 75°F |
| 110g 1:2:1 Stiff (50%) (Trimmed Read) | seed 28g | fresh flour 55g | room-temp water 27g | peak 6 - 8 hrs at 75°F |
| 130g 1:2:1 Stiff (50%) (Extended Read) | seed 33g | fresh flour 65g | room-temp water 32g | peak 6 - 8 hrs at 75°F |
| 100g 1:2:1 Stiff (50%) (Compact Read) | seed 25g | fresh flour 50g | room-temp water 25g | peak 6 - 8 hrs at 75°F |
| 140g 1:2:1 Stiff (50%) (Generous Read) | seed 35g | fresh flour 70g | room-temp water 35g | peak 6 - 8 hrs at 75°F |
Real-Time Dough & Starter Scaling Sandbox
Scale this 1:2:1 Stiff (50%) (1 2 1 stiff) Sour specification up or down on your digital scale with zero hydration drift.
How 1:2:1 Stiff (50%) Hydration Shifts Lactic-to-Acetic Fermentation in a 120g Build
Monod growth kinetics explain the 6 - 8 hrs window: the 1:2:1 Stiff (50%) feed drops the seed fraction to 30.0g per 4 parts, so fermentable sugar concentration sits just above the half-saturation constant for 30g of inoculum. Yeast divides fastest while sugar is plentiful, then slows as the 60g of new flour is exhausted and lactic acid accumulates.
Watch the jar wall. A 120g build in a straight-sided container rises almost exactly in proportion to its weight because 50% Stiff Lievito Madre levain traps little gas structure; mark the starting line with a rubber band and you can read the 6 - 8 hrs window without guessing.
Zero-Discard Scraping Method for 120g Levain (1:2:1 Stiff (50%))
- Divide 120g by 4 Parts (30.0g Each): A 1:2:1 Stiff (50%) ratio has 4 parts, so each part of your 120g target weighs 30.0g.
- Measure the 1 Seed Part (30g): That is your existing culture, weighed cold and fresh from the refrigerator.
- Measure the 2 Flour Part (60g) and 1 Water Part (30g): Add both, mix to a stiff paste, and cover the jar.
- Peak and Reserve (6 - 8 hrs): After 6 - 8 hrs at 75°F, portion out 120g and keep the balance as tomorrow's seed.
Diagnostic Answers: 1:2:1 Stiff (50%) (1 2 1 stiff) Sourdough Le
Is a 1:2:1 Stiff (50%) ratio too acidic for a 120g levain?
No. At 1:2:1 Stiff (50%) the acid from the previous batch is diluted across 2 parts of flour and 1 parts of water, giving a 50% stiff lievito madre levain that tastes clean and mild.
What is the real difference between 1:2:1 Stiff (50%) and a 1:1:1 feed?
A 1:1:1 feed keeps one third of the batch as seed and peaks fastest; 1:2:1 Stiff (50%) keeps one 4th, so it ripens more slowly but with far less inherited acidity.
How many grams of starter, flour and water make 120 g at a 1:2:1 Stiff (50%) ratio?
30g starter + 60g flour + 30g water = 120 g, split across 4 parts of 30.0g each.