Successful sourdough baking starts with one essential skill: knowing how to properly feed and maintain your sourdough starter. Without a strong and active starter, you cannot achieve a good rise in sourdough bread, focaccia, or artisan loaves.
This Sourdough Starter Feeding Ratio Calculator helps you accurately determine how much starter, flour, and water you need based on your custom feeding ratio. It removes guesswork and keeps your baking consistent, controlled, and predictable.
Your sourdough starter is a living culture of wild yeast and bacteria. It must be regularly fed to stay active, strong, and capable of leavening dough.
You should feed your starter every time before baking and also during storage periods to keep it alive and healthy. A weak starter leads to dense bread, poor rise, and inconsistent results.
A sourdough starter is a natural fermentation culture made from flour and water. It replaces commercial yeast and is responsible for the rise, flavor, and texture of sourdough bread.
A healthy starter should be bubbly, slightly tangy, and able to double in size after feeding.
A feeding ratio defines how much fresh flour and water you add relative to your existing starter. It is usually written as: Starter : Flour : Water
For example, a 1:2:2 ratio means 1 part starter, 2 parts flour, and 2 parts water. This controls fermentation speed, strength, and readiness time.
Precision in sourdough feeding is not just about baking success — it also affects consistency, waste reduction, and ingredient cost efficiency.
Using the correct amounts helps you:
Instead of guessing, this calculator gives you full control over your sourdough maintenance. You can scale feedings up or down depending on your baking schedule, temperature, and desired fermentation speed.
Whether you are preparing for daily baking or building a large levain, accurate ratios ensure better bread, every time.
Ambient temperature: 70–72°F (21–22°C). This cheat sheet helps you compare feeding ratios, fermentation speed, and real starter examples so you can better control your sourdough routine.
| Ratio | Rise Time | Example (Starter : Flour : Water) |
|---|---|---|
| 1:1:1 | 4–6 hrs | 20g : 20g : 20g |
| 1:2:2 | 6–8 hrs | 20g : 40g : 40g |
| 1:3:3 | 7–10 hrs | 20g : 60g : 60g |
| 1:4:4 | 8–12 hrs | 20g : 80g : 80g |
| 1:5:5 | 10–14 hrs | 20g : 100g : 100g |
These examples show how different custom feeding ratios affect your sourdough starter performance. By adjusting starter, flour, and water proportions, you can control fermentation speed, strength, and overall readiness for baking.
Feeding frequency depends on temperature and baking activity, but most starters are fed once every 12–24 hours at room temperature. A common balanced ratio is 1:2:2 or 1:3:3, while 1:4:4 is ideal for slower fermentation and milder acidity.
To feed your starter, discard part of the mixture, then add fresh flour and water in your chosen ratio. Mix until smooth, cover loosely, and let it ferment until it becomes bubbly and rises to its peak.
Most sourdough recipes use between 10% and 30% starter relative to the total flour weight in the dough. The exact amount depends on how fast you want fermentation and the flavor intensity you prefer.
Feed your starter when it has reached or just passed its peak rise. This is usually when it is most active, bubbly, and capable of producing strong fermentation for dough.
The standard feeding ratio is written as Starter : Flour : Water. A common beginner-friendly ratio is 1:2:2, while more advanced bakers often adjust ratios to control fermentation speed.
Yes. Regular feeding keeps the natural yeast and bacteria active. Without consistent feedings, the starter becomes weak, acidic, and loses its ability to rise bread effectively.
Feeding ratio depends on temperature, desired fermentation speed, and how long you want the starter to take to peak. Warmer environments usually need higher ratios, while cooler environments work well with lower ratios.
Most home bakers maintain between 20g and 100g of starter depending on baking frequency. Smaller amounts reduce waste, while larger amounts make frequent baking more convenient.
Understanding sourdough feeding ratios is one of the most important steps toward consistent, high-quality baking. Whether you are maintaining a daily starter or preparing for a full bake, precision in feeding directly affects flavor, rise, and overall dough performance.
This calculator helps you take full control of your starter by giving you exact measurements for flour, water, and starter based on your custom ratio. Instead of guessing or adjusting manually, you can now build predictable and repeatable fermentation every time.
With the right feeding balance, your sourdough starter stays active, stable, and ready whenever you need it — making better bread easier and more reliable.
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