The Science of Sourdough: Why Bakers Math Matters

The Science of Sourdough

Sourdough bread has been baked for over 5,000 years, making it one of humanity's oldest food preparation methods. Unlike commercial yeast breads, sourdough relies on a symbiotic culture of wild yeasts and lactobacillus bacteria to leaven and flavor the dough.

Understanding Fermentation

When you feed flour and water to your starter, the wild yeasts consume sugars and produce carbon dioxide (which makes the bread rise) and ethanol. Meanwhile, lactobacillus bacteria produce lactic and acetic acids, giving sourdough its characteristic tangy flavor.

Why Baker's Math Works

Baker's percentages express every ingredient as a percentage of the total flour weight:

- Flour: Always 100% (the baseline) - Water: Typically 65-85% (this is the "hydration") - Starter: Usually 15-25% - Salt: Typically 2%

This system allows bakers to scale recipes up or down while maintaining perfect proportions. Whether you are making one loaf or one hundred, the ratios remain consistent.

Hydration and Crumb Structure

The water-to-flour ratio (hydration) dramatically affects the bread's texture:

- 60-65%: Dense, tight crumb (bagels, sandwich bread) - 70-75%: Medium crumb with moderate holes (standard sourdough) - 78-85%: Open, airy crumb with large holes (ciabatta-style)

Higher hydration doughs are stickier and more challenging to handle, but produce the coveted open crumb structure that artisan bakers prize.

Calculate Your Recipe

Use our free Sourdough Calculator to compute precise ingredient quantities based on baker's percentages. Enter your desired total dough weight and hydration level, and get exact measurements for flour, water, starter, and salt.