How to Feed a Sourdough Starter

Demystifying Sourdough Feeding Ratios: The 1:1:1 vs. 1:10:10 Method

If you’ve been on your sourdough journey for a few miles, you know that keeping your starter happy isn’t just about feeding it—it’s about how and when you feed it. Your starter is a living, breathing ecosystem of wild yeast and lactic acid bacteria. To get that perfect, lofty rise and a beautifully balanced flavor profile, you have to manage its fuel supply.

Two of the most powerful tools in your baking toolkit are the 1:1:1 and 1:10:10 feeding ratios. Here is how to use them to control your baking schedule and avoid or fix a sluggish, overly acidic starter.

The Ratios Broken Down

Before we dive in, let’s talk anatomy of a ratio. The numbers always represent:

[Weight of Starter] : [Weight of Flour] : [Weight of Water]

Although you'll see people on socials feeding their starters willy-nilly without weighing, using a digital scale is non-negotiable for me. I always use equal parts flour and water by weight (which maintains a 100% hydration level) to keep things consistent, but I also sell sourdough from my cottage bakery and that consistency is important for me.

1. The 1:1:1 Ratio — Built for Speed (Same-Day Dough Making)

• The Formula: 50g starter + 50g flour + 50g water (this is for one standard loaf; adjust for your recipe)

• The Timeline: Peaks in roughly 4 to 6 hours (depending on ambient room temperature - cooler temperatures = slower peak; warmer temps = faster peak).

When you feed your starter equal parts food and starter, it doesn’t take long for that concentrated population of yeast to consume the fresh flour. This ratio is your best friend when you want to make dough today.

If you feed your starter a 1:1:1 ratio first thing in the morning, it will happily double or triple by midday, perfectly hitting its peak just in time for you to mix your autolyse and start your bulk fermentation.

2. The 1:10:10 Ratio — The Slow Burn (Overnight Maintenance)

• The Formula: 10g starter + 100g flour + 100g water (again, adjust quantity to your specific recipe/needs)

• The Timeline: Peaks in roughly 10 to 12 hours.
  

What if you want to mix your dough first thing in the morning, or what if your kitchen is incredibly warm and a standard feeding collapses too quickly? Enter the 1:10:10.

By giving a tiny amount of starter a massive feast, you are drastically slowing down the fermentation process. It takes the yeast and bacteria much longer to migrate through, consume, and populate that mountain of fresh flour and water. This is the ultimate overnight ratio; feed it before bed, and wake up to a vibrant, bubbly, peak-readiness starter exactly when you pour your morning coffee.

The Danger of the "Acid Trap"

To understand why a massive feeding like 1:10:10 is so magical, we have to talk about what happens when a starter gets neglected or consistently underfed: hyper-acidity.

What It's Like

An overly acidic starter has a few distinct red flags. Visually, it might look thin, runny, and watery rather than thick and mousse-like. It will develop a layer of liquid on top (hooch) and smell aggressively like vinegar, acetone, or nail polish remover instead of a pleasant, fruity, yogurt-like tang. It hasn't gone bad, but it's not the strong workhorse it could be!

Why It’s Bad for Your Bread

When a starter becomes too acidic, it's bad news for your dough structure. Lactic acid bacteria produce acids that, in high concentrations, begin to degrade the gluten matrix.

• It weakens the yeast, leading to a sluggish rise.

• It breaks down the gluten strength in your final dough, leaving you with a sticky, unmanageable mess that tears easily, shapes poorly, and turns into a flat pancake in the oven.
  

How the 1:10:10 Ratio Resets Your Starter

If your starter has fallen into the acid trap, simply feeding it a standard 1:1:1 ratio often won't fix it. Because you are carrying over so much old, highly acidic starter into the new mix, the pH drops too low right from the start, keeping the environment hostile for the yeast.

The 1:10:10 ratio acts as a dilution.

By taking just a tiny fraction of your acidic starter and diluting it with a massive amount of fresh, alkaline flour and water, you effectively flush out the accumulated acetic and lactic acids. It resets the pH of the jar, gives the yeast a clean slate, and allows them to robustly multiply without being choked out by their own acidic byproducts.

If your starter is smelling a bit sharp or your loaf volume has been disappointing, give it a 1:10:10 "cleansing" feeding. You’ll be amazed at how sweet, yeasty, and vigorously active it becomes by the next morning.

Quick Reference Guide

Ratio	Best For	Peak Time	Why Use It
1:1:1	Same-day dough making	4–6 hours	Fast turnaround when you want to mix dough later that afternoon.
1:10:10	Overnight prep & Acid reset	10–12 hours	Slows fermentation for morning baking and dilutes harsh acids.

Happy baking, and may your crumb be wonderfully open!

Love,

sandi