A Guide to Sourdough Starter Feeding Ratios

Maintaining a sourdough starter is a blend of art and science, with the feeding ratio playing a pivotal role. This ratio determines the balance of old starter to fresh flour and water, and it can influence both the starter’s health and the flavor of the final bread. Let’s delve into the various feeding ratios and how they can shape your sourdough journey.

Feeding ratios are typically expressed in terms of the amount of starter, fresh flour and fresh water. For example, a 1:1:1 ratio implies equal parts (by weight) of each component.

Regular bakers often prefer a 1:1:1 ratio, while occasional bakers might opt for 1:2:2 or 1:3:3 to extend feeding intervals. A 1:1:1 ratio imparts a pronounced sourness while a higher feeding ratio produces a milder tang. In warmer conditions where the starter matures quickly, a 1:3:3 ratio is more appropriate.

1. Common Feeding Ratios

a. 1:1:1 ratio

This ratio is the gold standard for those aiming to maintain a steady volume in their starter and stick to a regular feeding cycle. It ensures the microbial community remains vibrant and it is suitable for those baking on a regular basis.

The resulting starter boasts moderate acidity, producing bread with a balanced, pleasantly tangy flavor.

b. 1:2:2 ratio

By diluting the original starter more, this ratio offers the microbes more food to consume. It’s especially useful for individuals desiring longer intervals between feedings without risking underfeeding.

With this feeding ratio, the starter’s fermentation process slows, taking longer to reach its peak activity. This is particularly beneficial for those who does not bake often.

c. 1:3:3 or Higher ratio

This ratio is optimal for those moments when you intend to leave your starter unfed for a more extended period, such as during a vacation. Additionally, it’s a strategic choice for bakers aiming to lessen the sour tang in their baked goods.

The starter’s fermentation process at this ratio becomes significantly slower. While it allows for greater intervals between feedings, it’s important to note that the starter will need a longer duration to achieve its maximum activity. This can be a boon for those who want a more mellow sourness in their bread or those who appreciate the flexibility in their feeding schedule.

However, for the purpose of reducing the feeding frequency, it is best to keep the starter refrigerated after a 1:1:1 feeding ratio; a refrigerated starter only needs to be fed once a week.

2. Factors Influencing the Choice of Feeding Ratio

a. Baking Frequency: 

For those who bake regularly or even daily, a 1:1:1 ratio is often preferable. This keeps the starter in an active state, ensuring it’s always ready to leaven bread effectively.  If baking is more of an occasional activity, ratios like 1:2:2 or 1:3:3 become more suitable. These ratios allow for longer intervals between feedings without compromising the starter’s health.

b. Desired Flavor: 

Bakers aiming for a subtle sourness in their bread might gravitate towards a more diluted feeding ratio like 1:3:3. This reduced concentration allows for a gentler fermentation process, yielding milder flavors. 

For those who relish a pronounced tang in their sourdough, maintaining a 1:1:1 ratio can be ideal. This concentration facilitates a robust fermentation process, imparting a characteristic tang to the bread.

c. Ambient Temperature: 

The ideal temperature range for microbial activity is between 78°F (25°C) to 82°F (28°C). 

In climates or seasons with elevated temperatures, microbial activity in the starter naturally intensifies. As a result, bakers might opt for a higher feeding ratio, providing more sustenance to the active microbes, thereby preventing the starter from reaching its peak too swiftly.

In cooler settings, microbial activity slows down, and the starter might not need as much food. Thus, a balanced ratio like 1:1:1 might suffice.

3. The Influence of Hydration

While not directly a feeding ratio, the water-to-flour ratio in the feeding can impact the starter’s consistency. A 100% hydration (equal water and flour by weight) creates a thick, yet pourable batter. Adjusting this can produce a stiffer or more liquid starter, influencing its activity and flavor.

A stiffer starter at 60% hydration will promote a vinegar-like sourness and a more liquid starter at 125% hydration will promote a milder yogurt-like sourness. 


Feeding ratios are a foundational aspect of sourdough baking, providing bakers with the means to influence the health, activity, and flavor profile of their starter. By understanding and experimenting with different ratios, bakers can fine-tune their processes, ensuring that their sourdough creations are always on point.


Hey there! I'm Sam, your go-to pal for all things sourdough. I've been baking and kneading for 10 fun-filled years, and I can't wait to share the joy of turning simple ingredients into heavenly sourdough bread with you. Grab your apron and let's dive into this amazing world of sourdough bread together on this blog.

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