Baker's Percentage

The Secret Language of Bread: Mastering Baker's Math

If you've ever watched professional bakers discuss a recipe, you might hear them say, "This is 70% hydration," or "I use 2% salt." They aren't talking about the total weight of the dough. They are speaking Baker's Percentage, a universal system that makes scaling recipes up or down incredibly simple.
In this system, Flour is always 100%. Every other ingredient is expressed as a percentage of the total flour weight.

Why Use Baker's Percentage?

Home recipes are often written in cups or absolute weights (e.g., "500g flour, 300g water"). This works fine for making one loaf. But what if you want to make 50 loaves? Or just half a loaf?

1. Scalability: If you know your dough is 70% water, it doesn't matter if you start with 500g of flour or 50kg of flour. You just multiply the flour weight by 0.70 to get the water weight.

2. Comparison: Percentages allow you to instantly understand the texture of the bread.
- 60% Hydration: Stiff dough (Bagels, Pretzels).
- 65-70% Hydration: Standard artisan bread (Boules, Baguettes).
- 75-80%+ Hydration: Wet, airy dough with large holes (Ciabatta, Focaccia).

The Formula

Ingredient Weight = Flour Weight × (Ingredient Percentage / 100)

Let's say you want to make a classic French baguette with:
- 1000g Flour (This is your 100% base)
- 68% Water
- 2% Salt
- 1% Yeast

The Calculation:
- Water: 1000g × 0.68 = 680g
- Salt: 1000g × 0.02 = 20g
- Yeast: 1000g × 0.01 = 10g
Total Dough Weight: 1000 + 680 + 20 + 10 = 1710g.

Understanding Hydration

Hydration is the single most critical factor in bread baking. It controls the crumb structure (how open the holes are) and the crust thickness.

Low Hydration (50-57%): dense crumb, easy to shape (Bagels).
Medium Hydration (58-65%): tighter crumb, standard sandwich bread (French Bread, Pizza).
High Hydration (66-75%+): open crumb, chewy texture, difficult to shape (Sourdough, Ciabatta).

A Note on Sourdough (Starter)

If you are using a sourdough starter, the calculations get a tiny bit more complex because the starter itself contains both flour and water (usually 50/50).
Advanced bakers calculate the "Total Flour" (Flour in bowl + Flour in starter) and "Total Water" (Water in bowl + Water in starter) to get the true hydration percentage.