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All ingredient percentages calculate proportionally from this total flour weight.
Calculates the exact flour and ingredient weights needed to hit your target batch yield.
Formula & Prep Checklist
What Is Baker's Percentage? (The 100% Flour Rule)
In standard home cooking, recipes rely on arbitrary serving sizes, cups, and spoonfuls. But in artisan bread baking and pizza making, recipes are treated as chemical formulas governed by Baker’s Percentages (often called Baker's Math).
The core rule is remarkably simple: Total Flour weight is always 100%.
Every other ingredient in the formula-water, salt, yeast, starter, butter, or oil-is expressed as a direct percentage of that flour weight. Because flour is your anchor, you can instantly scale a recipe from a single small boule to 50 baguette loaves without changing the texture, flavor, or rise of the dough.
Why Baker's Math Adds Up to More Than 100%:
A common beginner confusion is thinking the total dough equals 100%. In baker's math, the sum of all percentages is usually between 165% and 190%. For example: 100% flour + 70% water + 2% salt + 1% yeast = 173% total dough formula.
How to Calculate Baker's Math (The 2 Simple Formulas)
Whether you want to scale up a batch or analyze a favorite recipe from an old cookbook, you only need two basic calculations:
1. Calculate Ingredient Weight from a Percentage:
Formula: Ingredient Weight = (Total Flour Weight × Baker's %) ÷ 100
Example: You have 500 g of bread flour and want 72% hydration (water):
(500 × 72) ÷ 100 = 360 g of water.
2. Calculate Baker's Percentage from Existing Weights:
Formula: Baker's % = (Ingredient Weight ÷ Total Flour Weight) × 100
Example: A recipe uses 450 g of flour and 9 g of fine sea salt:
(9 ÷ 450) × 100 = 2.0% salt.
Dough Hydration & Expected Crumb Texture
Hydration refers strictly to the ratio of total liquids to total flour. Water controls gluten development, dough extensibility, and the open texture (holes) of your finished crumb. Here is how hydration impacts handling and results:
- 55% – 62% Hydration:
- Dough Feel: Stiff, firm, very easy to shape.
- Expected Crumb: Tight, dense, uniform chew.
- Best For: Bagels, Pretzels, Crackers.
- 63% – 70% Hydration:
- Dough Feel: Supple, elastic, minimal stickiness.
- Expected Crumb: Soft, tender, sliceable crumb.
- Best For: Sandwich bread, Neapolitan pizza, Dinner rolls.
- 71% – 78% Hydration:
- Dough Feel: Tacky, stretchy, requires coil folds or stretch-and-folds.
- Expected Crumb: Open, airy, custardy crumb with medium holes.
- Best For: Artisan sourdough boules, Rustic batards.
- 79% – 85%+ Hydration:
- Dough Feel: Wet, slack, pours like thick batter.
- Expected Crumb: Wild, honeycomb structure, large alveoli.
- Best For: Ciabatta, Focaccia, Pan de Cristal.
The Sourdough Blindspot: Calculating "True Hydration"
Most basic calculators treat sourdough starter or levain as a single standalone ingredient. This creates inaccurate water ratios because standard sourdough starter is 100% hydration (equal parts flour and water by weight).
If you add 200 g of sourdough starter to your dough, you are quietly introducing 100 g of extra flour and 100 g of extra water into your mixing bowl. If your calculator ignores this, your dough will turn out substantially wetter than you intended.
Our calculator features an automated Starter Hydration Helper that extracts this hidden water and flour behind the scenes, ensuring the "True Hydration" percentage displayed on your dashboard is chemically exact.
The 4 Golden Rules of Artisan Dough Formulation
- Total Flour Is Always 100% (Even in Multi-Grain Blends):
If you mix 400 g of bread flour, 75 g of whole wheat, and 25 g of dark rye, your total flour base is 500 g (80% + 15% + 5% = 100%). Every liquid and leaven percentage continues to calculate from that combined 500 g total. - The Salt Sweet Spot is 1.8% to 2.2%:
Salt is not just seasoning; it tightens the gluten network and regulates yeast fermentation rate. Below 1.5%, dough becomes pale, slack, and over-proofs rapidly. Above 2.5%, fermentation slows significantly and the loaf tastes unpleasantly salty. Standard artisan baking defaults to 2.0%. - Thirsty Flours Require More Water:
Whole grain flours (whole wheat, rye, spelt) retain bran and germ, which absorb significantly more water than sifted white bread flours. When converting a white bread recipe to 30% whole wheat, expect to increase hydration by 2% to 4% to achieve the same dough consistency. - Always Weigh in Grams:
A cup of all-purpose flour can weigh anywhere from 120 g to 160 g depending on how tightly packed the scoop is. Weighing on a digital scale in grams ensures 100% repeatability every time you bake.
Frequently Asked Questions (FAQ)
Why is baker's percentage better than standard recipe scaling?
Standard scaling simply multiplies every ingredient linearly. Baker's percentage allows you to adjust the specific characteristics of your dough—such as increasing hydration for a crispier crust or dropping yeast for an extended 48-hour cold fermentation—without throwing off the foundational balance of the flour.
How do I calculate batch size using target dough weight?
If you know you want two 450 g loaves (900 g total dough) with 70% water, 2% salt, and 1% yeast (173% total formula): divide target dough weight by the total percentage sum as a decimal: 900 ÷ 1.73 = 520 g flour. Then calculate each ingredient from that 520 g flour base. (Our tool automates this when you select By Batch / Loaf Count mode).
Does butter, milk, or oil count toward dough hydration?
Whole milk is approximately 87% water, so professional bakers factor it into liquid hydration. Pure fats like olive oil and soft butter coat gluten strands rather than hydrating them; while they make dough softer, they are categorized as enrichments rather than direct water hydration.
What is the easiest hydration percentage for beginners?
Beginners should start between 65% and 68% hydration using high-protein bread flour. This range yields a loaf with great oven spring and an open crumb while remaining easy to knead, shape, and score without sticking to your hands or work surface.