Overnight 1:8:8 Sourdough Starter Feeding Ratio to Build 90g (12 - 16 hrs Peak Window)
High-dilution overnight levain math to build 90g of sweet, de-acidified starter (100% Liquid) with zero morning collapse.
Want 90g of active levain and zero waste? Mix 5g of your existing culture with 42g flour and 43g 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 110g (6g seed, 52g flour, 52g water) and the extra 20g stays in the jar as tomorrow's seed. Ideal for Extended 14-hour high-dilution de-acidifying feed.
- Exact 90g Build
- 5g : 42g : 43gStarter : Flour : Water (1:8:8)
- 90g + 20g Jar Reserve
- 6g : 52g : 52gBuilds 110g 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
1:8:8 Sourdough Starter Feeding Chart Around a 90g Build
Zero-waste gram breakdown for 1:8:8 (100% Liquid) centred on the 90g target, with the 110g jar reserve alongside.
| Target Levain Yield | Seed Starter (1 Part) | Fresh Flour (8 Parts) | Water (8 Parts) | Peak Ripening Time @ 75°F |
|---|---|---|---|---|
| 80g 1:8:8 ([Exact Build]) | seed 5g | fresh flour 38g | room-temp water 37g | peak 12 - 16 hrs at 75°F |
| 110g 1:8:8 (Slightly Leaner) | seed 6g | fresh flour 52g | room-temp water 52g | peak 12 - 16 hrs at 75°F |
| 90g 1:8:8 (Slightly Fuller) | seed 5g | fresh flour 42g | room-temp water 43g | peak 12 - 16 hrs at 75°F |
| 70g 1:8:8 (Much Leaner) | seed 4g | fresh flour 33g | room-temp water 33g | peak 12 - 16 hrs at 75°F |
| 100g 1:8:8 (Much Fuller) | seed 6g | fresh flour 47g | room-temp water 47g | peak 12 - 16 hrs at 75°F |
Real-Time Dough & Starter Scaling Sandbox
Scale this Overnight 1:8:8 (1 8 8) Sourdough St specification up or down on your digital scale with zero hydration drift.
De-Acidifying Your Culture: Why High-Ratio 1:8:8 Feeds Maximize Oven Spring (90g Build)
Scaling to 90 grams means every gram is shared across 17 parts (5.3g each). The 5g seed portion carries the entire wild yeast and lactobacilli population, the 42g flour portion supplies the substrate, and the 43g water portion sets the mobile phase for both.
Shaping behaviour downstream is decided here: a levain built at 1:8:8 from 5g of seed and 42g 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 90g Levain (1:8:8)
- Zero the Scale and Pre-weigh (6g / 52g / 52g): Set out three vessels and weigh each ingredient before you open the starter jar.
- Bloom the Seed (6g): Add the 6g of ripe seed to 52g of water and stir until the mixture becomes a uniform cloudy suspension.
- Add Flour in Two Pours (52g): Incorporate half the flour, wait 20 minutes for hydration, then work in the remainder so no dry pockets survive.
- Ferment to a Dome (12 - 16 hrs): At 75°F the 1:8:8 culture should double and dome in 12 - 16 hrs; pull 90g at peak and return 20g to the fridge.
Diagnostic Answers: Overnight 1:8:8 (1 8 8) Sourdough Starter Ra
Why is my 1:8:8 starter not doubling?
Usually the seed was neglected in the refrigerator. Two warm 1:2:2 refreshes at 76–78°F, each with 42g of fresh flour, will strip the acid and restart the yeast.
Can I still make 90g if I only have 45g of starter?
Feed 45g of seed with 42g flour and 43g water, then treat the resulting 130g of sourdough culture as your starter instead.
Can I make 90 grams 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 42g flour and 42g water.