How to Feed a 1:2:2 Sourdough Starter Ratio to Make 300g (Same-Day 6 - 8 hrs Peak)
Fast same-day levain build math to make 300g of active starter (100% Liquid) using a 1:2:2 feeding ratio.
To make 300 grams of active starter at a 1:2:2 ratio (1:2:2), weigh 60g of ripe seed, 120g of flour and 120g of water. That 100% Liquid culture will be domed and sweet in 6 - 8 hrs at 75°F, which is exactly the timing you want for Balanced 6–8 hour morning levain build. Feed 320g — 64g / 128g / 128g — if you want to stop discarding permanently.
- Exact 300g Build
- 60g : 120g : 120gStarter : Flour : Water (1:2:2)
- 300g + 20g Jar Reserve
- 64g : 128g : 128gBuilds 320g total (0g discard waste)
- Estimated Peak Window
- 6 - 8 hrsAt 74°F–76°F (23.5°C–24.5°C)
- Levain Hydration
- 100%Balanced 6–8 hour morning levain build
Gram-by-Gram 1:2:2 Levain Breakdown for 300g (100% Liquid)
Comparison of 1:2:2 builds either side of 300g, with ripening windows quoted at 75°F (24°C).
| Target Build Weight | Ripe Seed (1) | New Flour (2) | Liquid (2) | Time to Full Dome |
|---|---|---|---|---|
| Levain build 290g ([Your Target]) | 58g cultured seed | 116g sifted flour + 116g liquid | zero-waste reserve 20g | 6 - 8 hrs dome window |
| Levain build 320g (Leaner Read) | 64g cultured seed | 128g sifted flour + 128g liquid | zero-waste reserve 20g | 6 - 8 hrs dome window |
| Levain build 300g (Fuller Read) | 60g cultured seed | 120g sifted flour + 120g liquid | zero-waste reserve 20g | 6 - 8 hrs dome window |
| Levain build 280g (Micro Scale) | 56g cultured seed | 112g sifted flour + 112g liquid | zero-waste reserve 20g | 6 - 8 hrs dome window |
| Levain build 310g (Large Scale) | 62g cultured seed | 124g sifted flour + 124g liquid | zero-waste reserve 20g | 6 - 8 hrs dome window |
Real-Time Dough & Starter Scaling Sandbox
Scale this 1:2:2 (1 2 2) Sourdough Starter Rati specification up or down on your digital scale with zero hydration drift.
Fast Same-Day Kinetics: Why a 1:2:2 Ratio Peaks in 6 - 8 hrs (300g Build)
Because the 300g build holds only 60g of live culture, the 120g of flour and 120g of water must supply everything the yeast needs to reach a 6 - 8 hrs peak. Underrefreshing therefore produces a sour levain, while a correctly fed 1:2:2 jar domes within hours.
Shaping behaviour downstream is decided here: a levain built at 1:2:2 from 60g of seed and 120g of flour carries less residual acid than a 1:1:1 feed, so the dough it is folded into keeps more elastic recoil through bulk and produces taller oven spring.
Zero-Discard Scraping Method for 300g Levain (1:2:2)
- Never Scrap the Jar Clean: Leave a deliberate 64g remnant of starter in the vessel — this is the seed for the next 1:2:2 feed, not waste.
- Top Up with 128g Flour and 128g Water: These two additions convert your remnant into exactly 320g of 100% Liquid sourdough culture.
- Wait for the 6 - 8 hrs Peak: Confirm the dome and the escaping gas streaks before you need the sourdough culture.
- Return the Surviving 20g: Whatever sourdough culture is left after your bake goes straight back into the jar and the refrigerator, and the cycle repeats without a single discarded gram.
Diagnostic Answers: 1:2:2 (1 2 2) Sourdough Starter Ratio for 30
Can I make 300 g of levain with a stiff 50% starter?
A 1:2:2 feed already produces 100% liquid levain. For a 50% final hydration you would instead use 120g flour and 120g water.
Can I scale this 300 grams build up to 600g?
Double every number: 120g starter, 240g flour, 240g water. The ratio, and therefore the 6 - 8 hrs peak, is unchanged.
What happens if I use 1:2:2 starter in a very wet dough?
The 100% Liquid levain carries less acid, so a wet dough keeps more of its elasticity. Hold back a little extra water if your flour absorbs like 120g of bread flour does.