Baker's Percentages & Dough Hydration: Artisan Bread Quickstart
Master baker's math: calculate dough hydration percentages, anchor flour at 100%, and scale bread formulas to any target loaf weight with complete precision.
- In baker's percentages, total flour weight is always designated as 100%, and every other ingredient is calculated relative to that flour mass.
- Dough hydration percentage equals total water weight divided by total flour weight, dictating crumb openness and handling characteristics.
- Standard artisan bread formulas follow the golden ratio: 100% flour, 65–75% water, 2% salt, and 0.5–1% yeast or 20% levain.
- To scale any formula to a target dough weight in grams, divide target weight by the sum of all percentages expressed in decimal form.
If you read professional baking manuals or apprentice in an artisan bakery, you will never see a bread recipe that lists three cups of flour and one cup of water. Volumetric recipes are too unpredictable for yeast doughs, where tiny hydration shifts determine whether you bake an airy, custardy sourdough or a dense, stodgy loaf.
Instead, professional bakers use baker’s percentages (also known as “baker’s math”). By anchoring total flour at 100%, baker’s percentages allow you to instantly evaluate dough hydration, adjust fermentation speed, and scale formulas to any batch size—from a single 500-gram boule to five hundred baguettes.
The Core Concept: Flour Is Always 100%
In standard mathematics, parts of a whole must sum to 100%. In baker’s percentages, however, total flour weight is always defined as 100%, regardless of whether you are using 300 grams or 50 kilograms of grain. Every other ingredient is calculated as a mathematical percentage of that flour mass:
Baker's Percentage Formula: Baker's % = (Weight of Ingredient ÷ Total Weight of Flour) × 100%
Ingredient Weight Formula: Weight of Ingredient (g) = Total Flour Weight (g) × (Baker's % ÷ 100)
Because water, salt, yeast, and fats are added on top of the 100% flour baseline, the sum of all baker’s percentages in a standard bread dough typically totals 165% to 185%.
Dough Hydration Spectrum: The Liquid Ratio
The most critical variable in bread baking is hydration—the ratio of total water to total flour:
Dough Hydration Formula: Hydration % = (Total Water Weight ÷ Total Flour Weight) × 100%
| Hydration Range | Common Bread Styles | Crumb Characteristics | Handling Difficulty |
|---|---|---|---|
| 50% – 58% (Stiff) | Bagels, soft pretzels, noodles, crackers | Dense, tight, chewy, minimal air pockets | Very easy; non-sticky, easily shaped by hand |
| 60% – 68% (Standard) | Sandwich bread, challah, pizza, French bread | Uniform, fine-to-medium crumb; tender structure | Easy to moderate; holds shape well on bench |
| 70% – 78% (Artisan) | Sourdough boules, classic French baguettes | Open, irregular honeycomb holes; glossy crumb | Moderate; requires coil folds or stretch-and-folds |
| 80% – 90%+ (Wet) | Ciabatta, focaccia, pan de cristal | Highly open, translucent webs, large blisters | Advanced; requires wet hands, scraper, or pans |
High-protein flour—such as unbleached bread flour—absorbs roughly 4% to 6% more water than standard all-purpose flour while maintaining dough structure.
The Master Bread Formula (The Golden Ratio)
Most classic European lean doughs follow an established baseline:
- Flour: 100.0% (bread flour or flour blend)
- Water: 70.0% (hydration)
- Salt: 2.0% (diamond crystal kosher salt or fine sea salt)
- Instant Yeast: 1.0% (or 0.4% active dry yeast, or 20% sourdough levain)
- Total Formula Percentage: 173.0%
Salt is strictly maintained at 2.0% across commercial baking: it tightens gluten strands and regulates yeast fermentation. To understand crystal density differences across salts, consult our kosher salt conversion guide.
How to Scale to Any Target Loaf Weight
Suppose you want to bake a single artisan sourdough boule that weighs exactly 800 grams before entering the oven. To determine the gram weight of every ingredient, follow these two steps:
Step 1: Compute Total Flour Weight
Divide your target dough weight by the sum of all baker’s percentages expressed in decimal form:
Target Flour Formula: Flour Weight (g) = Target Dough Weight ÷ (Total Formula % ÷ 100)
Example Calculation: Flour Weight = 800 g ÷ 1.73 = 462.4 grams
Step 2: Multiply Flour Weight by Individual Percentages
- Bread Flour (100%): 462.4 g × 1.00 = 462 g
- Water (70%): 462.4 g × 0.70 = 324 g
- Salt (2%): 462.4 g × 0.02 = 9.2 g
- Instant Yeast (1%): 462.4 g × 0.01 = 4.6 g
- Sum of Ingredients: 462 + 324 + 9.2 + 4.6 = 800 grams
With a digital kitchen scale, you measure these four numbers directly into your mixing bowl. To scale larger production batches or adjust cake pans, use our interactive recipe and pan scaler or keep our printable kitchen chart in your kitchen for rapid conversions.
Frequently Asked Questions
Why do baker's percentages add up to more than 100%? ▾
Unlike standard statistical percentages where the sum of all parts equals 100%, baker's percentages express each ingredient relative to the total flour weight. Since water (70%), salt (2%), and yeast (1%) are added on top of flour (100%), the total baker's percentage often equals 170% to 180%.
How do I calculate hydration when using a sourdough starter? ▾
Account for the flour and water inside your levain. A 100% hydration starter consists of 50% flour and 50% water by weight. For 100g of starter, add 50g to your total formula flour and 50g to your total formula water before computing final hydration.
What is the easiest formula to scale a loaf of bread to a specific weight? ▾
Sum all percentage points in your formula (e.g., 100% flour + 70% water + 2% salt + 1% yeast = 173%, or 1.73 in decimal). Divide your target dough weight (e.g., 800 grams) by 1.73 to determine required flour weight (462.4g), then multiply that flour weight by each ingredient's percentage.