How to Feed a 1:1:1 Sourdough Starter Ratio to Make 50g (Same-Day 4 - 5 hrs Peak)
Fast same-day levain build math to make 50g of active starter (100% Liquid) using a 1:1:1 feeding ratio.
Want 50g of active levain and zero waste? Mix 17g of your existing culture with 17g flour and 16g water — a 1:1:1 ratio at 100% Liquid. Fed at 75°F the culture peaks in 4 - 5 hrs and smells sweet rather than sour. Scale up to 70g (23g seed, 23g flour, 24g water) and the extra 20g stays in the jar as tomorrow's seed. Ideal for Fast 4–5 hour same-day bake build.
- Exact 50g Build
- 17g : 17g : 16gStarter : Flour : Water (1:1:1)
- 50g + 20g Jar Reserve
- 23g : 23g : 24gBuilds 70g total (0g discard waste)
- Estimated Peak Window
- 4 - 5 hrsAt 74°F–76°F (23.5°C–24.5°C)
- Levain Hydration
- 100%Fast 4–5 hour same-day bake build
Scaling 1:1:1 Feeds Across 30g to 70g
Zero-waste gram breakdown for 1:1:1 (100% Liquid) centred on the 50g target, with the 70g jar reserve alongside.
| Target Levain Yield | Seed Starter (1 Part) | Fresh Flour (1 Parts) | Water (1 Parts) | Peak Ripening Time @ 75°F |
|---|---|---|---|---|
| 50g target ([Exact Build]) | seed 17g | flour 17g | water 16g | ripe in 4 - 5 hrs |
| 60g target (Slightly Leaner) | seed 20g | flour 20g | water 20g | ripe in 4 - 5 hrs |
| 40g target (Slightly Fuller) | seed 13g | flour 13g | water 14g | ripe in 4 - 5 hrs |
| 70g target (Much Leaner) | seed 23g | flour 23g | water 24g | ripe in 4 - 5 hrs |
| 30g target (Much Fuller) | seed 10g | flour 10g | water 10g | ripe in 4 - 5 hrs |
Real-Time Dough & Starter Scaling Sandbox
Scale this 1:1:1 (1 1 1) Sourdough Starter Rati specification up or down on your digital scale with zero hydration drift.
Fast Same-Day Kinetics: Why a 1:1:1 Ratio Peaks in 4 - 5 hrs (50g Build)
Monod growth kinetics explain the 4 - 5 hrs window: the 1:1:1 feed drops the seed fraction to 16.7g per 3 parts, so fermentable sugar concentration sits just above the half-saturation constant for 17g of inoculum. Yeast divides fastest while sugar is plentiful, then slows as the 17g of new flour is exhausted and lactic acid accumulates.
Readiness, not the clock, should end the feed. The 1:1:1 culture at 50 g should dome into a taut convex pillow and release gas in visible streaks when the jar is tilted; a levain that merely doubled and stayed flat has not finished fermenting and will underproof the dough.
Zero-Discard Scraping Method for 50g Levain (1:1:1)
- Check Room Temperature: Confirm your kitchen is close to 75°F (24°C). At 68°F a 1:1:1 feed stretches toward 4 - 5 hrs of extra ripening, and at 82°F it contracts noticeably.
- Build the 70g Base (23g Seed): Feed your seed starter with 23g of flour and 24g of water at 100% Liquid.
- Watch for the Convex Dome (4 - 5 hrs): The surface should bulge into a smooth pillow and jiggle when gently shaken, not collapse flat.
- Split the Peak (50g Out, 20g Back): Use 50g of the 70g build in your dough and restart the cycle with the 20g that is left.
Diagnostic Answers: 1:1:1 (1 1 1) Sourdough Starter Ratio for 50
Should the water be warm or cold for a 1:1:1 feed?
Room temperature, roughly 70°F (21°C). Hotter water risks shocking the culture, while colder water stretches the 4 - 5 hrs peak considerably.
What happens if I use 1:1:1 starter in a very wet dough?
The 100% Liquid levain carries less acid, so a wet dough keeps more of its elasticity. Hold back a little extra water if your flour absorbs like 17g of bread flour does.
Can I still make 50 grams if I only have 25g of starter?
Feed 25g of seed with 17g flour and 16g water, then treat the resulting 58g of levain as your starter instead.