Calculate the perfect ratio of starter, flour, and water for your sourdough feeds
g
Enter the weight of active sourdough starter in grams
g
Enter the weight of flour you plan to use in grams
g
Enter the weight of water you plan to use in grams
g
Enter your target total dough weight in grams
Starter Ratio—
Flour Ratio—
Water Ratio—
Total Amount—
Scaled Starter—
Scaled Flour—
Scaled Water—
Hydration Level—
What does this mean? The ratios show the proportional relationship between your ingredients as percentages. The scaled amounts automatically adjust your recipe to match your desired total weight while maintaining proper hydration. Hydration level indicates the percentage of water relative to flour, which affects dough texture and crumb structure.
Understanding Sourdough Starter Ratios
Sourdough baking is both an art and a science, with precise ratios playing a crucial role in achieving consistent, delicious results. The relationship between starter, flour, and water determines not only the flavor profile of your bread but also its texture, rise time, and keeping qualities. By using a sourdough starter calculator, you can ensure that every batch maintains the same professional-quality standards, whether you're feeding your starter daily or preparing dough for your next bake.
What Are Baker's Percentages?
In professional baking, recipes are often expressed using baker's percentages, where flour is set at 100% and all other ingredients are calculated as percentages of that flour weight. This system allows bakers to scale recipes up or down while maintaining the exact same proportions and characteristics. For sourdough, understanding these percentages helps you predict fermentation times, hydration levels, and the final texture of your bread. A typical sourdough might use 20% starter and 75-80% hydration, but these variables can be adjusted based on your preferences and environment.
The Importance of Hydration Level
Hydration level—the ratio of water to flour—is one of the most critical factors in sourdough baking. Higher hydration levels (80-90%) produce open crumb structures with large, irregular holes and a more rustic appearance. Lower hydration (65-75%) creates a tighter crumb and is easier to handle for beginners. The sourdough starter calculator automatically computes your hydration percentage, allowing you to understand how your recipe will behave before you start mixing. Adjusting hydration by just 5% can significantly impact your dough's extensibility, strength, and final bread characteristics.
Scaling Recipes for Consistency
One of the greatest challenges in sourdough baking is scaling recipes to fit your specific needs. Whether you want to make a single loaf or a dozen, maintaining proper ratios is essential. The scaled amounts provided by the calculator ensure that when you adjust your total desired amount, all ingredients scale proportionally. This prevents common mistakes like adding too much starter (which speeds fermentation excessively) or not enough water (which creates a dense crumb). By using accurate scaled measurements, you'll achieve consistent results batch after batch, building confidence in your sourdough technique.
Feeding Your Starter with Confidence
Maintaining a healthy sourdough starter requires regular feeding with precise ratios. Many recipes suggest a 1:1:1 ratio (equal parts starter, flour, and water by weight), but this can be adjusted based on room temperature and feeding frequency. Warmer environments might benefit from a 1:2:2 ratio to slow fermentation, while cold kitchens might use 1:1:1 for faster activity. Using the calculator to determine your ideal feeding ratios helps keep your starter vigorous and ready for baking. Consistent feeding schedules with calculated amounts ensure your starter remains predictable and reliable for all your sourdough projects.
Optimizing Your Baking Environment
The same recipe behaves differently depending on room temperature, humidity, and the strength of your starter. By understanding the underlying ratios and percentages, you can make informed adjustments to your process. If your kitchen is particularly cold, you might increase the starter percentage slightly to encourage fermentation. In hot weather, reducing the starter percentage slows the process, giving you more control over timing. The sourdough starter calculator provides the foundation for these adjustments, showing you exactly how each ingredient contributes to your final dough, enabling you to troubleshoot and refine your technique over time.
The most common starter ratio is 20% of your flour weight, though this can range from 10-50% depending on your desired fermentation speed and room temperature. A 20% ratio typically requires 4-6 hours of bulk fermentation at room temperature. Higher percentages (30-50%) accelerate fermentation, while lower percentages (10-20%) slow it down for cold overnight proofing.
What hydration level should I aim for?
Most sourdough recipes use 75-80% hydration, which balances ease of handling with an open crumb structure. Beginners often start at 75% for easier shaping, while experienced bakers might go to 85-90% for a more open crumb. The sourdough starter calculator helps you determine your exact hydration percentage based on your ingredient amounts.
How do I scale my sourdough recipe?
Enter your current ingredient amounts and your desired total amount in the calculator. The scaled amounts will automatically adjust all ingredients proportionally while maintaining the correct ratios. This ensures your bread will ferment and bake the same way regardless of batch size.
Why is the flour amount set to 100% in baker's percentages?
Flour is the foundation of any bread recipe, so it's set as the baseline at 100%. All other ingredients—water, salt, starter, and additions—are expressed as percentages of the flour weight. This system allows easy scaling and clear communication between bakers about recipe proportions.
How often should I feed my sourdough starter?
Active bakers typically feed their starter daily or twice daily at room temperature. If keeping your starter in the refrigerator, weekly feeding is usually sufficient. Use the calculator to maintain consistent feeding ratios, whether you prefer 1:1:1, 1:2:2, or other proportions based on your schedule and preferences.