Overnight 1:8:8 Sourdough Starter Feeding Ratio to Build 75g (12 - 16 hrs Peak Window)
High-dilution overnight levain math to build 75g of sweet, de-acidified starter (100% Liquid) with zero morning collapse.
Two numbers decide your 1:8:8 refresh: how much you want (75g) and how much the jar will cling to (20g). The first splits into 4g seed, 35g flour and 36g water. The second pushes it to 6g, 45g and 44g. At 75°F the 100% Liquid culture is ready in 12 - 16 hrs — a clean fit for Extended 14-hour high-dilution de-acidifying refresh.
- Exact 75g Build
- 4g : 35g : 36gStarter : Flour : Water (1:8:8)
- 75g + 20g Jar Reserve
- 6g : 45g : 44gBuilds 95g 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
75g 1:8:8 Feeding Neighbourhood: Seed, Flour, Water & Peak Window
Zero-waste gram breakdown for 1:8:8 (100% Liquid) centred on the 75g target, with the 95g jar reserve alongside.
| Target Levain Yield | Seed Starter (1 Part) | Fresh Flour (8 Parts) | Water (8 Parts) | Peak Ripening Time @ 75°F |
|---|---|---|---|---|
| 55g target ([Your Target]) | seed 3g | flour 26g | water 26g | ripe in 12 - 16 hrs |
| 75g target (Leaner Read) | seed 4g | flour 35g | water 36g | ripe in 12 - 16 hrs |
| 95g target (Fuller Read) | seed 6g | flour 45g | water 44g | ripe in 12 - 16 hrs |
| 65g target (Micro Scale) | seed 4g | flour 31g | water 30g | ripe in 12 - 16 hrs |
| 85g target (Large Scale) | seed 5g | flour 40g | water 40g | ripe in 12 - 16 hrs |
Dynamic Stoichiometric Workbench (4g : 35g : 36g)
Test custom loaf weights or alternative fermentation schedules directly against the 6g : 45g : 44g benchmark above.
De-Acidifying Your Culture: Why High-Ratio 1:8:8 Feeds Maximize Oven Spring (75g Build)
Monod growth kinetics explain the 12 - 16 hrs window: the 1:8:8 refresh drops the seed fraction to 4.4g per 17 parts, so fermentable sugar concentration sits just above the half-saturation constant for 4g of inoculum. Yeast divides fastest while sugar is plentiful, then slows as the 35g of new flour is exhausted and lactic acid accumulates.
Flour choice shifts the timeline more than most bakers expect. At 1:8:8 with 35g of flour, a malted bread flour peaks faster and sweeter than an unmalted one, because the added amylase liberates more maltose per minute and the culture simply runs out of substrate sooner.
Zero-Discard Scraping Method for 75g Levain (1:8:8)
- Check Room Temperature: Confirm your kitchen is close to 75°F (24°C). At 68°F a 1:8:8 feed stretches toward 12 - 16 hrs of extra ripening, and at 82°F it contracts noticeably.
- Build the 95g Base (6g Seed): Feed your seed starter with 45g of flour and 44g of water at 100% Liquid.
- Watch for the Convex Dome (12 - 16 hrs): The surface should bulge into a smooth pillow and jiggle when gently shaken, not collapse flat.
- Split the Peak (75 grams Out, 20g Back): Use 75 grams of the 95g build in your dough and restart the cycle with the 20g that is left.
Key Baker's Math Questions (Exact 75g Build: 4g : 35g : 36g)
Can I still make 75g if I only have 38g of starter?
Feed 38g of seed with 35g flour and 36g water, then treat the resulting 109g of sourdough culture as your starter instead.
How many grams of starter, flour and water make 75g at a 1:8:8 ratio?
4g starter + 35g flour + 36g water = 75g, split across 17 parts of 4.4g each.
Is a 1:8:8 ratio too acidic for a 75 g levain?
No. At 1:8:8 the acid from the previous batch is diluted across 8 parts of flour and 8 parts of water, giving a 100% liquid levain that tastes clean and mild.