How to Feed a 1:1:1 Sourdough Starter Ratio to Make 30g (Same-Day 4 - 5 hrs Peak)
Fast same-day levain build math to make 30g of active starter (100% Liquid) using a 1:1:1 feeding ratio.
Want 30g of active levain and zero waste? Mix 10g of your existing culture with 10g flour and 10g water ā a 1:1:1 ratio at 100% Liquid. Fed at 75Ā°F the starter peaks in 4 - 5 hrs and smells sweet rather than sour. Scale up to 50g (17g seed, 17g flour, 16g water) and the extra 20g stays in the jar as tomorrow's seed. Ideal for Fast 4ā5 hour same-day bake build.
- Exact 30g Build
- 10g : 10g : 10gStarter : Flour : Water (1:1:1)
- 30g + 20g Jar Reserve
- 17g : 17g : 16gBuilds 50g total (0g discard waste)
- Estimated Peak Window
- 4 - 5 hrsAt 74Ā°Fā76Ā°F (23.5Ā°Cā24.5Ā°C)
- Levain Hydration
- 100%Fast 4ā5 hour same-day bake build
1:1:1 Sourdough Starter Feeding Chart Around a 30g Build
Zero-waste gram breakdown for 1:1:1 (100% Liquid) centred on the 30g target, with the 50g jar reserve alongside.
| Target Levain Yield | Seed Starter (1 Part) | Fresh Flour (1 Parts) | Water (1 Parts) | Peak Ripening Time @ 75Ā°F |
|---|---|---|---|---|
| 50g target ([Anchor]) | seed 17g | flour 17g | water 16g | ripe in 4 - 5 hrs |
| 30g target (Down 10g) | seed 10g | flour 10g | water 10g | ripe in 4 - 5 hrs |
| 20g target (Up 10g) | seed 7g | flour 7g | water 6g | ripe in 4 - 5 hrs |
| 40g target (Down 20g) | seed 13g | flour 13g | water 14g | ripe in 4 - 5 hrs |
| 20g target (Up 20g) | seed 7g | flour 7g | water 6g | ripe in 4 - 5 hrs |
Custom Batch Recalculation Engine
Fine-tune starter hydration between 50% stiff and 125% liquid while keeping your starter feeding ratio Ć target weight ratios locked.
Fast Same-Day Kinetics: Why a 1:1:1 Ratio Peaks in 4 - 5 hrs (30g Build)
Monod growth kinetics explain the 4 - 5 hrs window: the 1:1:1 refresh drops the seed fraction to 10.0g per 3 parts, so fermentable sugar concentration sits just above the half-saturation constant for 10g of inoculum. Yeast divides fastest while sugar is plentiful, then slows as the 10g of new flour is exhausted and lactic acid accumulates.
Scaling the refresh scales the acid dilution too. A 30g 1:1:1 build and a 50g build do not carry the same proportion of the previous batch's acid, because the extra 17g of flour and 16g of water dilute the 17g seed further ā which is why the buffered version always tastes marginally milder.
Zero-Discard Scraping Method for 30g Levain (1:1:1)
- Zero the Scale and Pre-weigh (17g / 17g / 16g): Set out three vessels and weigh each ingredient before you open the starter jar.
- Bloom the Seed (17g): Add the 17g of ripe seed to 16g of water and stir until the mixture becomes a uniform cloudy suspension.
- Add Flour in Two Pours (17g): 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 75Ā°F the 1:1:1 culture should double and dome in 4 - 5 hrs; pull 30g at peak and return 20g to the fridge.
Technical Q&A: How to Feed a 1:1:1 Sourdough Starter Ratio to M
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 10g of bread flour does.
How much extra should I build so I never run out of starter?
Build 50g in total ā 17g starter, 17g flour, 16g water ā and the leftover 20g becomes the seed for the next feed.
What flour should I use for a 30g 1:1:1 levain?
A 12%+ protein bread flour for the 10g of flour gives a strong levain; adding whole wheat or rye at 20% of that weight speeds it up and adds pleasant acidity.