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How to Make a Sourdough Starter

Updated: Nov 29, 2023


To make a sourdough starter, you'll need a few simple things:

  • 1. Flour: You can use bread flour, all-purpose flour, or a combination of both. Some variations might include a small percentage of rye flour for added flavor.

  • 2. Water: Chlorine-free water is preferred. You can use tap water that's been left out for a day to allow any chlorine to evaporate, or use bottled spring water.

  • 3. Container: A glass or plastic container is ideal. Avoid metal containers as they can react with the acids produced during fermentation.

  • 4. Measuring Tools: You'll need a kitchen scale for accurate measurements of flour and water. A digital scale is recommended.

  • 5. Clean Cloth or Plastic Wrap: To cover the container while the starter ferments. This allows airflow while preventing contaminants from entering.

  • 6. Rubber Band or Marker: To mark the initial level of the mixture in the container. This helps you track the rise and fall of the starter.

  • 7. Time: Sourdough starter requires time for fermentation. You'll need around a week to develop a strong and active starter.

Optional but helpful:

  • Rye Flour/Whole wheat flour:: Adding a small amount of rye flour /whole wheat (about 5% of the total flour weight) can enhance the fermentation process and add flavor to your starter).

  • Digital Thermometer: To monitor the temperature of the room or the water you're using. Sourdough starters prefer temperatures around 70°F (21°C).

  • Notes or Journal: Keeping track of your daily feedings and observations can help you fine-tune your starter's progress.

  • Bowl Scraper or Spoon: For mixing and discarding the starter.

Remember, the main components are flour, water, and patience. With these basic items, you can create a successful sourdough starter that will become the foundation for your delicious homemade bread.


Step-By-Step Recipe:

The sourdough starter recipe uses 20g of bread flour and 5g of rye flour (or any other choice of your flour) making minimum discard.

Day 1:

  1. In a glass or plastic container, mix 20g of bread flour and 5g of rye flour with 25g of water.

  2. Stir well to create a thick, paste-like consistency.

  3. Loosely cover the container with a clean cloth or plastic wrap and let it sit at room temperature (around 75°F or 23°C) for 24 hours.

Day 2:

  1. Discard half of the mixture from Day 1.

  2. Add 20g of bread flour and 5g of rye flour with 25g of water to the remaining mixture.

  3. Mix well, cover loosely, and let it sit at room temperature for another 24 hours.

Day 3:

  1. Discard half of the mixture again.

  2. Add 20g of bread flour and 5g of rye flour with 25g of water.

  3. Mix, cover loosely, and let it sit for 24 hours.


Day 4:

  1. By now, you should see some bubbles and the mixture might have grown in volume.

  2. Discard half of the mixture.

  3. Add 20g of bread flour and 5g of rye flour with 25g of water.

  4. Mix, cover loosely, and let it sit for 24 hours.

Day 5:

  1. The mixture should be more bubbly and doubled in size.

  2. Discard half of the mixture.

  3. Add 20g of bread flour and 5g of rye flour with 25g of water.

  4. Mix, cover loosely, and let it sit for 24 hours.

Day 6-Day 8 and onward:

  1. Your starter should now be active, bubbly, and have a little tangy smell.

  2. Continue discarding half of the mixture and feeding it with 20g of bread flour and 5g of rye flour with 25g of water once a day.

  3. You can switch to feeding it every 12 hours if you want a stronger starter.

  4. To test if your starter is ready for baking bread, drop a tablespoon of the starter into a glass of room temperature water. It should float, if it does not then follow the above steps for 1-2days.

  5. You can also feed it twice a day following 1:2:2 ratio.

Day 9 and onwards:


1:3:3 ratio


5g active starter


10g bread flour


5g rye flour.


15g water


If your starter reaches peak volume in less than 12 hours and starts to fall down, it means it's getting matured faster and is more hungry than you are feeding it. Increase the feeding ratio or feeding times.


Maintaining your starter:

  • After about a week, your starter should be strong and ready to use.

  • Keep it in the refrigerator and feed it once a week with the same ratios of flour and water.

  • Before using it in a recipe, take it out of the fridge, let it come to room temperature, and feed it twice or thrice to activate it and make it stronger.


This process will create a sourdough starter with a blend of bread flour and rye flour. Remember the main components are flour, water and patience. With these basic items you can create a successful sourdough starter that will become the foundation for your delicious homemade sourdough breads .Enjoy making your own sourdough starter.

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