Overnight 1:8:8 Sourdough Starter Feeding Ratio to Build 250g (12 - 16 hrs Peak Window)
High-dilution overnight levain math to build 250g of sweet, de-acidified starter (100% Liquid) with zero morning collapse.
The arithmetic of a 1:8:8 feeding is simple: 250g of culture divided by 17 parts gives 14.7g per part, so the seed is 15g, the fresh flour is 118g and the water is 117g. At 100% Liquid this extended 14-hour high-dilution de-acidifying feed build ripens in 12 - 16 hrs. If you keep a 20g jar remainder, feed 270g instead: 16g seed, 127g flour, 127g water — zero discard, permanently.
- Exact 250g Build
- 15g : 118g : 117gStarter : Flour : Water (1:8:8)
- 250g + 20g Jar Reserve
- 16g : 127g : 127gBuilds 270g 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 250g Build
Zero-waste gram breakdown for 1:8:8 (100% Liquid) centred on the 250g target, with the 270g jar reserve alongside.
| Target Levain Yield | Seed Starter (1 Part) | Fresh Flour (8 Parts) | Water (8 Parts) | Peak Ripening Time @ 75°F |
|---|---|---|---|---|
| 240g 1:8:8 levain [Anchor] | 14g seed culture | 113g flour | 113g water | peak 12 - 16 hrs |
| 270g 1:8:8 levain Down 10g | 16g seed culture | 127g flour | 127g water | peak 12 - 16 hrs |
| 250g 1:8:8 levain Up 10g | 15g seed culture | 118g flour | 117g water | peak 12 - 16 hrs |
| 230g 1:8:8 levain Down 20g | 14g seed culture | 108g flour | 108g water | peak 12 - 16 hrs |
| 260g 1:8:8 levain Up 20g | 15g seed culture | 122g flour | 123g water | peak 12 - 16 hrs |
Live Parameter Solver for Overnight 1:8:8 Sourdough Starter Feeding
Dial in custom baker's percentages and export your adjusted 15g : 118g : 117g formula for bake day.
De-Acidifying Your Culture: Why High-Ratio 1:8:8 Feeds Maximize Oven Spring (250g Build)
The 1:8:8 ratio dilutes organic acid carried over from the previous batch by roughly 17:1 at 250 g. Because 15g of that inoculum is only 14.7g per part, the residual lactic and acetic acid entering the new batch is proportionally smaller — which is why 100% Liquid cultures taste cleaner and rise faster.
Watch the jar wall. A 250g build in a straight-sided container rises almost exactly in proportion to its weight because 100% Liquid sourdough culture traps little gas structure; mark the starting line with a rubber band and you can read the 12 - 16 hrs window without guessing.
Zero-Discard Scraping Method for 250g Levain (1:8:8)
- Zero the Scale and Pre-weigh (16g / 127g / 127g): Set out three vessels and weigh each ingredient before you open the starter jar.
- Bloom the Seed (16g): Add the 16g of ripe seed to 127g of water and stir until the mixture becomes a uniform cloudy suspension.
- Add Flour in Two Pours (127g): 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 250 g at peak and return 20g to the fridge.
Cereal Chemistry & Bench Execution FAQs
Can I still make 250g if I only have 125g of starter?
Feed 125g of seed with 118g flour and 117g water, then treat the resulting 360g of levain as your starter instead.
How long can I keep the leftover starter in the fridge?
At 38°F (3°C) the 20g reserve rests indefinitely. Cold slows the culture without stopping it, and the 12 - 16 hrs peak simply arrives sooner once you refresh it.
Why does my 1:8:8 levain smell sour instead of sweet?
Sourness means the seed was over-acidic going in. Feed 118g of fresh flour against 15g of the old culture twice in a row at 78°F and the taint disappears.