How to Feed a 1:2:2 Sourdough Starter Ratio to Make 200g (Same-Day 6 - 8 hrs Peak)
Fast same-day levain build math to make 200g of active starter (100% Liquid) using a 1:2:2 feeding ratio.
A 1:2:2 feed for 200 g splits the jar into 5 equal units of 40.0g — 40g ripe seed, 80g fresh flour, 80g water. Those three weights total exactly 200 g, and the culture reaches a full dome in 6 - 8 hrs at 75°F. Building 220g instead (44g / 88g / 88g) leaves the 20g jar reserve so nothing is ever thrown away. Best for: Balanced 6–8 hour morning levain build.
- Exact 200g Build
- 40g : 80g : 80gStarter : Flour : Water (1:2:2)
- 200g + 20g Jar Reserve
- 44g : 88g : 88gBuilds 220g 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
Zero-Discard 1:2:2 Starter Math at 200g (40g : 80g : 80g)
Comparison of 1:2:2 builds either side of 200g, with ripening windows quoted at 75°F (24°C).
| Target Build Weight | Ripe Seed (1) | New Flour (2) | Liquid (2) | Time to Full Dome |
|---|---|---|---|---|
| 200g target ([Target]) | seed 40g | flour 80g | water 80g | ripe in 6 - 8 hrs |
| 190g target (One Step Down) | seed 38g | flour 76g | water 76g | ripe in 6 - 8 hrs |
| 210g target (One Step Up) | seed 42g | flour 84g | water 84g | ripe in 6 - 8 hrs |
| 180g target (Two Steps Down) | seed 36g | flour 72g | water 72g | ripe in 6 - 8 hrs |
| 220g target (Two Steps Up) | seed 44g | flour 88g | water 88g | ripe in 6 - 8 hrs |
Dynamic Stoichiometric Workbench (40g : 80g : 80g)
Test custom loaf weights or alternative fermentation schedules directly against the 44g : 88g : 88g benchmark above.
Fast Same-Day Kinetics: Why a 1:2:2 Ratio Peaks in 6 - 8 hrs (200g Build)
Zero-waste refreshing only works when the arithmetic is exact. The 200g build needs 80g of flour and 80g of water against 40g of seed; the 220g jar build needs 88g and 88g against 44g. Round to whole grams and the 20g reserve survives every cycle.
Timing your bake around the refresh is what makes a 1:2:2 build useful: count backwards from your target oven time by 6 - 8 hrs plus your bulk duration, and you arrive at the moment you should stir 80g of flour into 80g of water for balanced 6–8 hour morning levain build.
Zero-Discard Scraping Method for 200g Levain (1:2:2)
- Check Room Temperature: Confirm your kitchen is close to 75°F (24°C). At 68°F a 1:2:2 feed stretches toward 6 - 8 hrs of extra ripening, and at 82°F it contracts noticeably.
- Build the 220g Base (44g Seed): Feed your seed starter with 88g of flour and 88g of water at 100% Liquid.
- Watch for the Convex Dome (6 - 8 hrs): The surface should bulge into a smooth pillow and jiggle when gently shaken, not collapse flat.
- Split the Peak (200g Out, 20g Back): Use 200g of the 220g build in your dough and restart the cycle with the 20g that is left.
Key Baker's Math Questions (Exact 200g Build: 40g : 80g : 80g)
Should the water be warm or cold for a 1:2:2 feed?
Room temperature, roughly 70°F (21°C). Hotter water risks shocking the culture, while colder water stretches the 6 - 8 hrs peak considerably.
Can I still make 200 grams if I only have 100g of starter?
Feed 100g of seed with 80g flour and 80g water, then treat the resulting 260g of levain as your starter instead.
What flour should I use for a 200g 1:2:2 levain?
A 12%+ protein bread flour for the 80g of flour gives a strong levain; adding whole wheat or rye at 20% of that weight speeds it up and adds pleasant acidity.