Sourdough Calculator

A professional sourdough calculator designed for home and professional bakers. Adjust your recipe using precise baker’s percentages to achieve the perfect loaf every time.

Total Dough Weight

0 g

Calculations are based on Baker’s Percentage, where each ingredient is a percentage of the total flour weight (100%).

Ingredient	Baker’s %	Weight (grams)	Total %
Flour	100.0%	500.0 g	0.0%
Water	75.0%	375.0 g	0.0%
Starter	20.0%	100.0 g	0.0%
Salt	2.0%	10.0 g	0.0%
Total	197.0%	985.0 g	100.0%

Ingredient breakdown by weight and percentage. This table helps visualize the ratios in your dough, a key function of a good sourdough calculator.

Dynamic chart showing the proportional weights of each ingredient. The best sourdough calculator tools offer visual aids like this.

What is a Sourdough Calculator?

A sourdough calculator is an essential tool for bakers that simplifies the process of creating and scaling sourdough bread recipes. Unlike standard recipes with fixed measurements, sourdough baking relies on “baker’s percentages,” a system where all ingredients are expressed as a percentage of the total flour weight. This method provides flexibility and consistency. Our sourdough calculator automates these calculations, allowing you to adjust variables like hydration (water content) and starter amount to modify your dough’s characteristics without complex manual math.

This tool is invaluable for everyone from beginners seeking consistency to advanced bakers experimenting with new formulas. A common misconception is that you need a new recipe for every loaf size. With a powerful sourdough calculator, you can scale any recipe up or down by simply changing the total flour weight, and all other ingredients will adjust proportionally. For a more detailed breakdown of baker’s percentages, see this guide to flour types.

Sourdough Calculator Formula and Mathematical Explanation

The core of any sourdough calculator is the baker’s percentage formula. The flour is always considered 100%, and every other ingredient is a percentage of that flour’s weight.

The step-by-step derivation is as follows:

1. Flour Weight (F): This is your base input, e.g., 500g.
2. Water Weight (W): W = F * (Hydration % / 100)
3. Starter Weight (S): S = F * (Starter % / 100)
4. Salt Weight (Sa): Sa = F * (Salt % / 100)
5. Total Dough Weight (TDW): TDW = F + W + S + Sa

This system allows bakers to discuss recipes in a universal language. A “75% hydration dough” means the water weight is 75% of the flour weight, regardless of loaf size. Understanding this is key to using a sourdough calculator effectively.

Variables Table

Variable	Meaning	Unit	Typical Range
Total Flour	The base weight for all calculations.	grams (g)	300g – 1500g
Hydration	Percentage of water relative to flour. Affects crumb openness.	%	65% – 90%
Starter/Levain	Percentage of starter relative to flour. Affects fermentation speed.	%	10% – 30%
Salt	Percentage of salt relative to flour. Controls flavor and fermentation.	%	1.8% – 2.5%

Key variables used in our sourdough calculator.

Practical Examples (Real-World Use Cases)

Example 1: Standard Beginner’s Loaf

A baker wants to make a single, manageable loaf. They use the sourdough calculator with the following inputs:

• Total Flour: 500g
• Hydration: 70%
• Starter: 20%
• Salt: 2%

The calculator instantly provides the weights: Flour: 500g, Water: 350g, Starter: 100g, Salt: 10g. The total dough weight is 960g, a perfect size for a standard Dutch oven. This is a great starting point for anyone new to sourdough.

Example 2: High Hydration Whole Wheat Loaf

An experienced baker wants to make two larger, more open-crumb loaves using some whole wheat flour. They know whole wheat absorbs more water, so they increase the hydration. They use the sourdough calculator to plan.

• Total Flour: 1000g (for two loaves)
• Hydration: 82%
• Starter: 15% (for a longer, slower ferment)
• Salt: 2.2%

The results: Flour: 1000g, Water: 820g, Starter: 150g, Salt: 22g. Total dough weight: 1992g (or 996g per loaf). The calculator makes this kind of experimentation simple and predictable. For more advanced recipes, consider using a baker’s percentage calculator.

How to Use This Sourdough Calculator

Using this sourdough calculator is straightforward. Here’s a step-by-step guide:

1. Enter Total Flour: Start with the amount of flour you want to use. 500g is great for one loaf.
2. Set Hydration: Adjust the hydration percentage. For beginners, 68-75% is recommended. Higher percentages yield a more open, airy crumb but the dough is stickier and harder to handle.
3. Define Starter Percentage: Choose your starter or levain percentage. A higher percentage (e.g., 25%) will lead to a faster fermentation, while a lower percentage (e.g., 15%) will slow it down, developing more flavor.
4. Add Salt Percentage: Set the salt, typically around 2%. Salt is crucial for flavor and for strengthening the gluten structure.
5. Review Results: The calculator instantly updates the “Total Dough Weight” and the gram weights for each ingredient. The table and chart also update in real-time.

Use the “Reset” button to return to default values. Use the “Copy Results” button to save a plain-text version of your recipe to your clipboard for easy note-taking. This sourdough calculator is a powerful tool for achieving baking consistency.

Key Factors That Affect Sourdough Results

Beyond the numbers from a sourdough calculator, several factors influence your final loaf:

• Starter Strength: A young, vigorous starter will raise bread more effectively than one that is sluggish. Feed your starter regularly to keep it active. Our guide to maintaining a sourdough starter has more info.
• Flour Type: Different flours (bread flour, all-purpose, whole wheat, rye) absorb water differently and have varying gluten potential. Bread flour is high in protein and provides good structure.
• Ambient Temperature: Temperature is a major factor in fermentation speed. Dough will ferment much faster in a warm kitchen (e.g., 25°C/77°F) than a cool one (e.g., 20°C/68°F). This is where a bread proofing calculator can be useful.
• Water Temperature: Using warm water can help kick-start fermentation, especially in a cooler environment.
• Shaping Technique: Proper shaping builds tension in the dough, which helps it hold its shape and rise upwards (oven spring) during baking.
• Baking Method: Baking in a covered Dutch oven traps steam, which keeps the crust soft initially, allowing for maximum oven spring.

Frequently Asked Questions (FAQ)

1. What hydration level is best for beginners?
A hydration level between 68% and 75% is a great starting point. The dough is manageable, not too sticky, and produces a reliable, beautiful loaf. Our sourdough calculator defaults to 75% as a common target.

2. Does the hydration of my starter matter?
Yes, it technically does. This sourdough calculator assumes your starter is at 100% hydration (equal parts flour and water by weight), which is the most common practice. If your starter is stiffer or more liquid, the overall dough hydration will be slightly different, but for most bakers, this effect is minor.

3. How much starter should I use?
A starter percentage of 15-25% of the flour weight is typical. Use a higher percentage if your kitchen is cool or you want a faster bulk fermentation. Use less if your kitchen is warm or you want a long, slow fermentation for more flavor development.

4. Can I use this sourdough calculator for different types of flour?
Absolutely. However, be aware that whole grain flours like whole wheat or rye absorb more water than white flour. If you use a high percentage of whole grains, you may need to increase the hydration to achieve a similar dough consistency. A dough hydration calculator can help fine-tune this.

5. What is “autolyse” and how does it fit in?
Autolyse is the process of mixing just the flour and water before adding the starter and salt. This gives the flour time to fully hydrate. To do this, simply use the water and flour weights from the sourdough calculator, mix them, and let them rest for 20-60 minutes before adding the salt and starter.

6. Why is my dough so sticky?
Stickiness is usually a result of high hydration or under-developed gluten. If you’re new to sourdough, try reducing the hydration slightly. Also, ensure you are developing gluten through adequate stretching and folding.

7. How do I get a more open crumb?
A more open, airy crumb is typically achieved with higher hydration (78%+), strong flour (bread flour), a vigorous starter, and gentle handling during shaping to preserve the gas bubbles. This sourdough calculator is the first step to experimenting with high-hydration doughs. For more on this, see our beginner sourdough loaf recipe.

8. How many loaves does 500g of flour make?
Using 500g of flour will yield one loaf of approximately 900-1000g, which is a perfect size for a standard 5-quart Dutch oven. To make two loaves, simply start with 1000g of flour in the sourdough calculator.

Related Tools and Internal Resources

Expand your baking knowledge with these related tools and guides:

• Pizza Dough Calculator: Apply baker’s percentages to create the perfect pizza crust. A great next step after mastering bread.
• Understanding Flour Types: A deep dive into how different flours affect your dough’s flavor and structure.
• Bread Proofing Calculator: Estimate proofing times based on temperature and starter percentage.
• Maintaining a Sourdough Starter: Learn the best practices for feeding and storing your starter to keep it healthy and active.
• Baker’s Percentage Calculator: A more generic calculator for any type of bread, not just sourdough.
• Levain Calculator: Perfect for building a levain for your specific recipe needs.