Overnight 1:8:8 Sourdough Starter Feeding Ratio to Build 40g (12 - 16 hrs Peak Window)
High-dilution overnight levain math to build 40g of sweet, de-acidified starter (100% Liquid) with zero morning collapse.
Want 40 grams of active levain and zero waste? Mix 2g of your existing culture with 19g flour and 19g water — a 1:8:8 ratio at 100% Liquid. Fed at 75°F the starter peaks in 12 - 16 hrs and smells sweet rather than sour. Scale up to 60g (4g seed, 28g flour, 28g water) and the extra 20g stays in the jar as tomorrow's seed. Ideal for Extended 14-hour high-dilution de-acidifying feed.
- Exact 40g Build
- 2g : 19g : 19gStarter : Flour : Water (1:8:8)
- 40g + 20g Jar Reserve
- 4g : 28g : 28gBuilds 60g total (0g discard waste)
- Estimated Peak Window
- 12 - 16 hrsAt 74°F–76°F (23.5°C–24.5°C)
- Levain Hydration
- 100%Extended 14-hour high-dilution de-acidifying feed
Reference Table: 1:8:8 Ratios at 40g and Its Neighbours
Weights derived from the 17-part 1:8:8 division, where one part equals 2.4g.
| How Much to Make | Starter (1 Part) | Flour (8 Parts) | Water (8 Parts) | Peak Hours (75°F) |
|---|---|---|---|---|
| Levain build 40g ([Target]) | 2g cultured seed | 19g sifted flour + 19g liquid | zero-waste reserve 20g | 12 - 16 hrs dome window |
| Levain build 50g (One Step Down) | 3g cultured seed | 24g sifted flour + 23g liquid | zero-waste reserve 20g | 12 - 16 hrs dome window |
| Levain build 30g (One Step Up) | 2g cultured seed | 14g sifted flour + 14g liquid | zero-waste reserve 20g | 12 - 16 hrs dome window |
| Levain build 60g (Two Steps Down) | 4g cultured seed | 28g sifted flour + 28g liquid | zero-waste reserve 20g | 12 - 16 hrs dome window |
| Levain build 20g (Two Steps Up) | 1g cultured seed | 9g sifted flour + 10g liquid | zero-waste reserve 20g | 12 - 16 hrs dome window |
Interactive Starter Feeding Ratio × Target Weight Calculator
Compare your exact mixing bowl dimensions, flour protein percentage, or discard weight in real time.
De-Acidifying Your Culture: Why High-Ratio 1:8:8 Feeds Maximize Oven Spring (40g Build)
The acid dilution is asymmetric: dropping from a 1:1:1 feed to a 1:8:8 feed multiplies the flour and water by 8 and 8 while the seed stays fixed, so at 40 g the 2g of inoculum is spread across a far larger medium. That is precisely why 100% Liquid starters are prized for extended 14-hour high-dilution de-acidifying feed work.
Hydration discipline at 100% Liquid means the 19g of water should be room temperature, not hot. Water above 95°F can shock the lactobacilli and stall the 12 - 16 hrs peak, while water below 60°F pushes fermentation into a slow acidifying phase that flattens the eventual rise.
Zero-Discard Scraping Method for 40g Levain (1:8:8)
- Feed at the Right Moment: For extended 14-hour high-dilution de-acidifying refresh, begin the 1:8:8 refresh 12 - 16 hrs before you plan to mix dough.
- Mix 4g Seed, 28g Flour, 28g Water: Combine everything in the jar and swirl until the flour is fully hydrated.
- Cover and Rest (12 - 16 hrs): Keep the jar at 75°F, ideally inside a proofing box, until the culture peaks.
- Use 40g and Keep 20g: The levain goes into your dough at full stretch; the reserve becomes the next cycle's 1:8:8 seed.
Frequently Asked Questions for This Starter Feeding Ratio × Target Weight Spec
Can I make 40 g of levain with a stiff 50% starter?
A 1:8:8 feed already produces 100% liquid levain. For a 50% final hydration you would instead use 19g flour and 19g water.
What flour should I use for a 40 grams 1:8:8 levain?
A 12%+ protein bread flour for the 19g of flour gives a strong levain; adding whole wheat or rye at 20% of that weight speeds it up and adds pleasant acidity.
How many grams of starter, flour and water make 40g at a 1:8:8 ratio?
2g starter + 19g flour + 19g water = 40g, split across 17 parts of 2.4g each.