How to Feed a 1:1:1 Sourdough Starter Ratio to Make 150g (Same-Day 4 - 5 hrs Peak)
Fast same-day levain build math to make 150g of active starter (100% Liquid) using a 1:1:1 feeding ratio.
The arithmetic of a 1:1:1 refreshing is simple: 150g of starter divided by 3 parts gives 50.0g per part, so the seed is 50g, the fresh flour is 50g and the water is 50g. At 100% Liquid this fast 4–5 hour same-day bake build build ripens in 4 - 5 hrs. If you keep a 20g jar remainder, refresh 170g instead: 57g seed, 57g flour, 56g water — zero discard, permanently.
- Exact 150g Build
- 50g : 50g : 50gStarter : Flour : Water (1:1:1)
- 150g + 20g Jar Reserve
- 57g : 57g : 56gBuilds 170g 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
Zero-Discard 1:1:1 Starter Math at 150g (50g : 50g : 50g)
Weights derived from the 3-part 1:1:1 division, where one part equals 50.0g.
| How Much to Make | Starter (1 Part) | Flour (1 Parts) | Water (1 Parts) | Peak Hours (75°F) |
|---|---|---|---|---|
| Levain build 130g ([Target]) | 43g cultured seed | 43g sifted flour + 44g liquid | zero-waste reserve 20g | 4 - 5 hrs dome window |
| Levain build 150g (One Step Down) | 50g cultured seed | 50g sifted flour + 50g liquid | zero-waste reserve 20g | 4 - 5 hrs dome window |
| Levain build 170g (One Step Up) | 57g cultured seed | 57g sifted flour + 56g liquid | zero-waste reserve 20g | 4 - 5 hrs dome window |
| Levain build 140g (Two Steps Down) | 47g cultured seed | 47g sifted flour + 46g liquid | zero-waste reserve 20g | 4 - 5 hrs dome window |
| Levain build 160g (Two Steps Up) | 53g cultured seed | 53g sifted flour + 54g liquid | zero-waste reserve 20g | 4 - 5 hrs dome window |
On-Bench Hydration & Fermentation Adjuster
Modify base flour mass, levain inoculation, or ambient kitchen temperature below to recalculate from this 50g : 50g : 50g baseline.
Fast Same-Day Kinetics: Why a 1:1:1 Ratio Peaks in 4 - 5 hrs (150g Build)
A 1:1:1 feed at 150 grams is really a statement about how much acid you want to inherit. At 1:1:1, the 50.0g-per-part arithmetic places 50g of already-acidified culture into 50g of virgin flour plus 50g of water, and that dilution ratio governs the final pH of your levain.
Retard the leftover, not the sourdough culture. The 4 - 5 hrs peak at 100% Liquid is a room-temperature event; once you have used your 150g, park the remaining 20g of the 170g build in the refrigerator at 38°F, where the culture rests without consuming its own starch supply.
Zero-Discard Scraping Method for 150g Levain (1:1:1)
- Zero the Scale and Pre-weigh (57g / 57g / 56g): Set out three vessels and weigh each ingredient before you open the starter jar.
- Bloom the Seed (57g): Add the 57g of ripe seed to 56g of water and stir until the mixture becomes a uniform cloudy suspension.
- Add Flour in Two Pours (57g): Incorporate half the flour, wait 20 minutes for hydration, then work in the remainder so no dry pockets survive.
- Ferment to a Dome (4 - 5 hrs): At 75°F the 1:1:1 culture should double and dome in 4 - 5 hrs; pull 150g at peak and return 20g to the fridge.
Common Scaling & Troubleshooting Questions (50g : 50g : 50g)
What happens if I use 1:1:1 culture 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 50g of bread flour does.
Is a 1:1:1 ratio too acidic for a 150g levain?
No. At 1:1:1 the acid from the previous batch is diluted across 1 parts of flour and 1 parts of water, giving a 100% liquid levain that tastes clean and mild.
Why is my 1:1:1 starter not doubling?
Usually the seed was neglected in the refrigerator. Two warm 1:2:2 refreshes at 76–78°F, each with 50g of fresh flour, will strip the acid and restart the yeast.