Stop Guessing Your Water Weight: The Free Sourdough Hydration Calculator & Guide

Confused by baker’s math? Our free Sourdough Hydration Calculator makes it easy. Learn how water percentages change your dough, crust, and crumb.

Welcome back to Matt’s Kitchen at Doughn’t Knock It. If you have spent any time in the sourdough community, you have probably heard bakers throwing around percentages like they are calculating rocket trajectories. “I pushed this one to 85%!” or “I kept it at a stiff 65%.”

If you are a beginner, this is usually the exact moment your eyes glaze over. But here is the secret the bread purists don’t want to admit: baker’s math is incredibly simple, and it is the ultimate cheat code for baking better bread. Water is the single biggest controller of your dough’s texture and your bread’s final crumb. To make adjusting your recipes effortless, we built this free, interactive Sourdough Hydration Calculator.

What is Sourdough Hydration?

In simple terms, sourdough hydration is the total weight of the water divided by the total weight of the flour, expressed as a percentage. For example, if a recipe calls for 1000 grams of flour and 700 grams of water, the hydration is 70%. The hydration level dictates everything from how sticky the dough feels on your counter to whether your baked loaf has a tight, sandwich-style crumb or wild, lacy, cavernous holes.

The Doughn’t Knock It Hydration Calculator

Slide the toggles below to input your flour and water weights. The calculator will instantly give you your hydration percentage and tell you exactly what kind of dough profile you are about to create!

The Sourdough Hydration Zones: What to Expect

So, what do those percentages actually mean for your hands and your oven? Here is the breakdown of the three main hydration zones:

1. Low Hydration (50% - 65%): The Stiff Dough

• The Vibe: Dense, tight, and requires some serious elbow grease to knead. It won't stick to your hands or the counter.
• The Crumb: Closed and uniform. You won't get giant holes, which means your butter and jam won't fall through to your plate.
• Best For: Sourdough bagels, pretzel bites, and classic sandwich loaves. This is the easiest zone for beginners to handle.

2. Medium Hydration (68% - 75%): The Artisan Standard

• The Vibe: Tacky but manageable. It requires basic stretch-and-folds to build tension but holds its shape beautifully when you score it.
• The Crumb: The "Goldilocks" crumb—light and airy, but with enough structural integrity to hold heavy flavor inclusions like roasted garlic or thick swirls of cinnamon sugar.
• Best For: Your everyday rustic boules and batards.

3. High Hydration (78% - 85%+): The Wildcard

• The Vibe: Basically a puddle. It is incredibly sticky, slacks out quickly on the counter, and requires advanced handling techniques (like the slap-and-fold) to tame it.
• The Crumb: Wild, lacy, glossy, and full of massive, cavernous air pockets.
• Best For: Authentic ciabatta, pan de cristal, and ultra-crispy sourdough focaccia.

The Ultimate Pro-Tip: The "Flour Factor"

Before you go pushing your hydration to 85% to get those massive air holes, you need to know one crucial rule: Not all flours absorb water the same way.

Hydration is entirely dependent on the protein content of your flour. A 75% hydration dough made with strong bread flour or whole wheat flour (which drinks water like a sponge) will feel tacky and manageable. However, if you try to make a 75% hydration dough using a cheap, low-protein, all-purpose flour, you will end up with an unmanageable, soupy mess that refuses to hold its shape.

Always match your hydration goals to the strength of your flour!

Frequently Asked Questions (FAQ)

What is the best hydration for sourdough beginners?

The sweet spot for beginners is right around 70% hydration. It provides enough water to give you a beautiful, open artisan crumb, but it isn't so wet that the dough becomes impossible to shape.

Does my sourdough starter count towards the hydration percentage?

Yes, technically. A standard sourdough starter is kept at 100% hydration (equal parts flour and water by weight). If you use 100g of starter, you are adding 50g of water and 50g of flour to your total recipe. For everyday baking, many home bakers ignore this to keep the math simple, but for strict accuracy, those amounts should be added to your total flour and water weights.

Why is my sourdough dough so sticky?

If your dough is too sticky to handle, your hydration is likely too high for the type of flour you are using. To fix this in the future, either drop your water weight by 5% or switch to a flour with a higher protein content (like bread flour), which can absorb more moisture.