Sourdough Starter Hydration Explained – What Does 100% Hydration Mean?
If you’ve been reading sourdough recipes or tips online, you’ve probably seen phrases like “100% hydration starter.” An immediately you're taken back to your very intense maths percentages class - But what does that 100% actually mean? Let’s simplify it!
What Is Sourdough Starter Hydration?
Hydration refers to the ratio of water to flour in your starter. A 100% hydration starter means you use equal parts flour and water by weight (not volume!).
For example: 100g flour + 100g water = 100% hydration starter.
Why It Matters
- It affects how thick or runny your starter is
- It impacts fermentation speed and activity (how long it takes to rise)
- It helps with consistency in recipes
Is 100% Hydration Best?
Yes—for most home bakers, 100% hydration is the easiest to maintain. It’s predictable, beginner-friendly, and works with most sourdough recipes. And in Malta's climate, less hydration recipes are very high maintenance, especially in the heat.
How to Maintain 100% Hydration
- Always use equal weights (e.g., 30g starter, 100g flour, 100g water)
- Mix well until smooth and thick like pancake batter
- Feed your starter regularly—at least once a week if kept in the fridge
Quick Tip:
Use a digital kitchen scale! Measuring by weight is far more accurate than by cups or spoons—and makes your hydration ratio spot on every time.
Need a Starter That’s Already Perfectly Hydrated?
Order your ready-to-use 100% hydration starter from Start Malta and skip the guesswork. It’s fresh, active, and made with organic flour—ready for your next bake!