Overnight 1:8:8 Sourdough Starter Feeding Ratio to Build 400g (12 - 16 hrs Peak Window)
High-dilution overnight levain math to build 400g of sweet, de-acidified starter (100% Liquid) with zero morning collapse.
To make 400g of active culture at a 1:8:8 ratio (1:8:8), weigh 24g of ripe seed, 188g of flour and 188g of water. That 100% Liquid culture will be domed and sweet in 12 - 16 hrs at 75°F, which is exactly the timing you want for Extended 14-hour high-dilution de-acidifying feed. Feed 420g — 25g / 198g / 197g — if you want to stop discarding permanently.
- Exact 400g Build
- 24g : 188g : 188gStarter : Flour : Water (1:8:8)
- 400g + 20g Jar Reserve
- 25g : 198g : 197gBuilds 420g 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
Scaling 1:8:8 Feeds Across 380g to 420g
Zero-waste gram breakdown for 1:8:8 (100% Liquid) centred on the 400g target, with the 420g jar reserve alongside.
| Target Levain Yield | Seed Starter (1 Part) | Fresh Flour (8 Parts) | Water (8 Parts) | Peak Ripening Time @ 75°F |
|---|---|---|---|---|
| 420g 1:8:8 ([Target]) | seed 25g | fresh flour 198g | room-temp water 197g | peak 12 - 16 hrs at 75°F |
| 400g 1:8:8 (One Step Down) | seed 24g | fresh flour 188g | room-temp water 188g | peak 12 - 16 hrs at 75°F |
| 380g 1:8:8 (One Step Up) | seed 22g | fresh flour 179g | room-temp water 179g | peak 12 - 16 hrs at 75°F |
| 410g 1:8:8 (Two Steps Down) | seed 24g | fresh flour 193g | room-temp water 193g | peak 12 - 16 hrs at 75°F |
| 390g 1:8:8 (Two Steps Up) | seed 23g | fresh flour 184g | room-temp water 183g | peak 12 - 16 hrs at 75°F |
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 (400g Build)
Zero-waste refreshing only works when the arithmetic is exact. The 400g build needs 188g of flour and 188g of water against 24g of seed; the 420g jar build needs 198g and 197g against 25g. Round to whole grams and the 20g reserve survives every cycle.
Timing your bake around the refresh is what makes a 1:8:8 build useful: count backwards from your target oven time by 12 - 16 hrs plus your bulk duration, and you arrive at the moment you should stir 188g of flour into 188g of water for extended 14-hour high-dilution de-acidifying refresh.
Zero-Discard Scraping Method for 400g Levain (1:8:8)
- Zero the Scale and Pre-weigh (25g / 198g / 197g): Set out three vessels and weigh each ingredient before you open the culture jar.
- Bloom the Seed (25g): Add the 25g of ripe seed to 197g of water and stir until the mixture becomes a uniform cloudy suspension.
- Add Flour in Two Pours (198g): 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 400g at peak and return 20g to the fridge.
Frequently Asked Questions for This Starter Feeding Ratio × Target Weight Spec
Can I scale this 400g build up to 800g?
Double every number: 48g culture, 376g flour, 376g water. The ratio, and therefore the 12 - 16 hrs peak, is unchanged.
How long does a 1:8:8 feeding take to peak?
At 75°F (24°C) the culture domes in 12 - 16 hrs; a cooler room adds roughly 3.8% for every degree below that.
What is the real difference between 1:8:8 and a 1:1:1 feed?
A 1:1:1 feed keeps one third of the batch as seed and peaks fastest; 1:8:8 keeps one 17th, so it ripens more slowly but with far less inherited acidity.