How to Feed a 1:1:1 Sourdough Starter Ratio to Make 75g (Same-Day 4 - 5 hrs Peak)
Fast same-day levain build math to make 75g of active starter (100% Liquid) using a 1:1:1 feeding ratio.
Two numbers decide your 1:1:1 feed: how much you want (75 grams) and how much the jar will cling to (20g). The first splits into 25g seed, 25g flour and 25g water. The second pushes it to 32g, 32g and 31g. At 75°F the 100% Liquid culture is ready in 4 - 5 hrs — a clean fit for Fast 4–5 hour same-day bake build.
- Exact 75g Build
- 25g : 25g : 25gStarter : Flour : Water (1:1:1)
- 75g + 20g Jar Reserve
- 32g : 32g : 31gBuilds 95g 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
75g 1:1:1 Feeding Neighbourhood: Seed, Flour, Water & Peak Window
Zero-waste gram breakdown for 1:1:1 (100% Liquid) centred on the 75g target, with the 95g jar reserve alongside.
| Target Levain Yield | Seed Starter (1 Part) | Fresh Flour (1 Parts) | Water (1 Parts) | Peak Ripening Time @ 75°F |
|---|---|---|---|---|
| 55g target ([Your Target]) | seed 18g | flour 18g | water 19g | ripe in 4 - 5 hrs |
| 75g target (Leaner Read) | seed 25g | flour 25g | water 25g | ripe in 4 - 5 hrs |
| 95g target (Fuller Read) | seed 32g | flour 32g | water 31g | ripe in 4 - 5 hrs |
| 65g target (Micro Scale) | seed 22g | flour 22g | water 21g | ripe in 4 - 5 hrs |
| 85g target (Large Scale) | seed 28g | flour 28g | water 29g | ripe in 4 - 5 hrs |
Interactive Starter Feeding Ratio × Target Weight Calculator
Compare your exact mixing bowl dimensions, flour protein percentage, or discard weight in real time.
Fast Same-Day Kinetics: Why a 1:1:1 Ratio Peaks in 4 - 5 hrs (75g Build)
Because the 75g build holds only 25g of live culture, the 25g of flour and 25g of water must supply everything the yeast needs to reach a 4 - 5 hrs peak. Underfeeding therefore produces a sour levain, while a correctly fed 1:1:1 jar domes within hours.
Flour choice shifts the timeline more than most bakers expect. At 1:1:1 with 25g 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 (1:1:1)
- Reserve the 20g Jar Remainder (32g): Tip your starter jar and scrape every last gram into a clean vessel — roughly 32g — so nothing is discarded.
- Combine the 1:1:1 Feed (32g + 31g): Stir 32g of flour into 32g of seed, then add 31g of room-temperature water until no dry flour remains.
- Mark the 95g Target: Level the jar and tape a line at the starting height; the culture should dome well past it within 4 - 5 hrs at 75°F.
- Harvest 75 grams and Return 20g: Pour 75 grams of peaked levain into your dough, then scrape the surviving 20g back into the jar and refrigerate at 38°F.
Frequently Asked Questions for This Starter Feeding Ratio × Target Weight Spec
How long can I keep the leftover starter in the fridge?
At 38°F (3°C) the 20g reserve rests indefinitely. Cold slows the culture without stopping it, and the 4 - 5 hrs peak simply arrives sooner once you refresh it.
What is the real difference between 1:1:1 and a 1:1:1 refresh?
A 1:1:1 refresh keeps one third of the batch as seed and peaks fastest; 1:1:1 keeps one 3th, so it ripens more slowly but with far less inherited acidity.
Does the 75g figure include the jar remnants?
No. 75g is the usable levain you take out of the jar; the jar build is 95g so that 20g of culture always survives the transfer.