Baker's Math Demystified: How to Scale Any Bread Recipe from 1 to 10 Loaves

The Universal Language of Baking

Unlike standard kitchen cooking where ingredients are measured in arbitrary volume cups or fixed gram weights, professional baking uses **Baker's Percentages** (also known as Baker's Math).

In Baker's Math, the **Total Weight of Flour is always defined as 100.0%**. Every other ingredient—water, starter, salt, seeds—is expressed as a mathematical percentage of that flour weight.

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The Classic Country Loaf Formula

A standard artisan sourdough loaf formula is expressed as follows: - **Flour Blend:** 100.0% (e.g., 85% Bread Flour + 15% Whole Wheat) - **Water:** 72.0% - **Levain:** 20.0% - **Salt:** 2.0% - **Total Baker's Ratio:** $100\% + 72\% + 20\% + 2\% = \mathbf{194.0\%}$

Notice that the sum of the percentages is **194.0%**, not 100%. This is the fundamental beauty of Baker's Math: you can immediately see the hydration (72%) and salinity (2%) at a glance, regardless of whether you are baking 1 loaf or 50 loaves.

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How to Reverse-Calculate Batch Size from Desired Raw Dough Weight

Suppose your goal is to make **2 loaves of 850 grams each** (total raw dough batch = 1,700g). How do you calculate the flour, water, and starter weights?

Step 1: Calculate the Total Baker's Ratio $$\text{Baker's Factor} = 1.0 + 0.72 + 0.20 + 0.02 = 1.94$$

Step 2: Calculate the Base Flour Weight $$\text{Base Flour Weight} = \frac{\text{Total Batch Weight}}{\text{Baker's Factor}} = \frac{1700\text{g}}{1.94} = \mathbf{876.3\text{g}}$$

Step 3: Multiply Each Percentage by the Base Flour Weight - **Flour:** $876.3\text{g} \times 1.00 = 876\text{g}$ - **Water:** $876.3\text{g} \times 0.72 = 631\text{g}$ - **Levain:** $876.3\text{g} \times 0.20 = 175\text{g}$ - **Salt:** $876.3\text{g} \times 0.02 = 17.5\text{g}$ - **Total Check:** $876 + 631 + 175 + 17.5 = 1,699.5\text{g} \approx 1,700\text{g}$

Our **SourdoughCalc** engine automates this entire reverse-calculation in real-time under 1 millisecond.