Sourdough Feeding Calculator

What the Sourdough Feeding Calculator does

The Sourdough Feeding Calculator helps bakers quickly figure out how much flour and water to add when refreshing a sourdough starter. Instead of guessing, you can calculate a precise feeding based on three key factors: the amount of starter you keep after discarding, the feeding ratio, and the hydration percentage of the flour-water mix.

This is especially useful when you want a starter that is consistent from one feeding to the next. A well-fed starter is easier to maintain, more predictable in rise time, and often more reliable for baking. Whether you are maintaining a small home starter or preparing a large batch for bread day, this sourdough feeding calculator removes the math guesswork.

The calculator outputs Total Starter After Feeding (g), which tells you the final combined weight of the starter after you add flour and water. This makes it simple to scale your feedings up or down depending on your routine.

How to use the Sourdough Feeding Calculator

Using the Sourdough Feeding Calculator is straightforward. You only need a few measurements and preferences to get an accurate result.

1. Enter Existing Starter (g): This is how much starter you currently have before feeding.
2. Enter Starter Kept After Discard (g): This is the amount of starter you want to keep and feed after discarding the rest.
3. Select the Feeding Ratio: The ratio tells the calculator how much flour and water to add relative to the starter being kept. For example, a 1:1:1 feeding means equal parts starter, flour, and water by weight.
4. Set the Hydration (%): Hydration determines how wet your feeding mixture is. A 100% hydration means equal weights of flour and water.
5. Review the result: The calculator gives you Total Starter After Feeding (g), so you know the final weight of the refreshed starter.

If you are new to sourdough maintenance, a few common feeding styles can help you understand the inputs:

• 1:1:1 — equal parts starter, flour, and water
• 1:2:2 — one part starter, two parts flour, two parts water
• 1:3:3 — one part starter, three parts flour, three parts water

These ratios affect how quickly the starter ferments and how long it takes to peak. A sourdough feeding calculator helps you adjust the feed to match your baking schedule.

How the Sourdough Feeding Calculator formula works

The calculator uses a simple weight-based formula to estimate the result after feeding. The formula provided is:

use_seed_only + (use_seed_only * feed_ratio) + ((use_seed_only * feed_ratio) * hydration_percent / 100)

Here is what each part means:

• use_seed_only = the amount of starter you keep after discard
• feed_ratio = how much flour is added compared with the kept starter
• hydration_percent = how much water is included in the feeding mix

In practical terms, the formula calculates:

• The starter you retain
• The flour added based on the feeding ratio
• The water added based on the hydration percentage

For example, if you keep 50 g of starter, use a 1:2 feeding ratio, and set hydration to 100%, the feeding would work like this:

• Starter kept: 50 g
• Flour added: 100 g
• Water added: 100 g

The total after feeding would be 250 g. That is the amount labeled as Total Starter After Feeding (g).

This method is helpful because it keeps everything based on grams, which are more precise than cups or tablespoons. Sourdough baking is sensitive to small changes, so weight measurements usually produce the best results.

Use cases for the Sourdough Feeding Calculator

There are many situations where a sourdough feeding calculator is useful. It can save time, reduce waste, and improve starter consistency.

• Daily starter maintenance: Keep your starter healthy with the same feeding plan each day.
• Preparing for baking: Build the exact amount of starter you need for a loaf or multiple loaves.
• Reducing waste: Feed only the amount you plan to keep, instead of overfeeding and discarding extra starter later.
• Changing starter size: Scale your starter up when you need more levain, or down if you want a smaller maintenance routine.
• Adjusting fermentation speed: Use different feeding ratios to slow down or speed up activity depending on room temperature and baking schedule.

This calculator is also helpful for bakers who keep starters in the refrigerator. A lower feeding ratio may be enough for cold storage, while a higher ratio can support a stronger, more active starter before baking day.

Other factors to consider when calculating Total Starter After Feeding (g)

While the Sourdough Feeding Calculator provides a reliable result, real-world sourdough care depends on a few additional factors. These can influence how your starter behaves after feeding.

• Flour type: Whole wheat, rye, and white flour absorb water differently and can affect fermentation speed.
• Room temperature: Warmer kitchens usually speed up starter activity, while cooler environments slow it down.
• Starter maturity: Younger starters may be less predictable than well-established ones.
• Feeding frequency: A starter fed more often may need smaller ratios, while a neglected starter may need a larger refresh.
• Mixing method: Thorough mixing helps distribute flour and water evenly, improving consistency.

It is also important to remember that hydration is not the same as final texture in every case. Some flours create thicker or thinner mixtures even at the same hydration percentage. If your starter seems too stiff or too runny, you may need to adjust slightly after using the calculator.

For best results, treat the output as a guideline that gives you a precise starting point. From there, you can fine-tune based on your starter’s activity and your baking goals.

FAQ

What is a sourdough feeding ratio?

A feeding ratio describes the relationship between the starter you keep and the flour and water you add. For example, a 1:1:1 ratio means one part starter, one part flour, and one part water. Higher ratios, like 1:3:3, create a larger feeding and often slow fermentation a bit.

Why does hydration matter in sourdough feeding?

Hydration controls how wet or firm the starter becomes after feeding. A 100% hydration starter is common because it is easy to mix and maintain. Lower hydration creates a stiffer starter, while higher hydration makes it looser and may change fermentation speed.

Can I use the Sourdough Feeding Calculator for any amount of starter?

Yes. You can use it for small starter amounts, like 20 g, or larger batches if you are building enough starter for multiple recipes. The calculator is especially helpful because it scales automatically based on the amount you keep.

What does Total Starter After Feeding (g) mean?

This is the final combined weight of the starter after you add flour and water. It includes the starter you kept plus the newly added feed. Knowing this total helps you plan for future feedings or recipe preparation.

Is this calculator useful for beginner bakers?

Absolutely. Beginners often struggle with sourdough math, especially when adjusting feedings. A sourdough feeding calculator makes the process simpler by giving a clear result in grams, which improves consistency and reduces waste.

Using a Sourdough Feeding Calculator is one of the easiest ways to make sourdough maintenance more accurate and less stressful. By keeping track of the starter you retain, the feeding ratio you choose, and the hydration level you want, you can create a starter that fits your baking schedule and your preferred style of bread making.