Professional baker's math for every recipe
Baker's percentage, sometimes called baker's math or baker's formula, is the universal language of professional baking. In this notation system, every ingredient in a recipe is expressed as a percentage of the total flour weight. Flour is always defined as 100%, and every other ingredient is weighed relative to that base. A recipe with 65% water simply means you use 65 grams of water for every 100 grams of flour — regardless of how large or small your batch is. This elegant system solves the biggest frustration in home and professional baking: recipe scaling. When a recipe is written in baker's percentages, scaling up to bake for a crowd or scaling down for a small test loaf requires nothing more than multiplying each percentage by the new flour weight. There is no need to recalculate ratios or guess at proportions. The recipe remains perfectly consistent whether you are making 300 grams of dough or 30 kilograms. Our Baker's Percentage Calculator supports two core workflows. In Weight-to-Percentage mode, you enter your ingredient weights and the tool instantly shows you the baker's percentage for every component. This is perfect for reverse-engineering an existing recipe, documenting a recipe you have developed by feel, or comparing your formula to standard bread profiles. In Percentage-to-Weight mode, you enter a flour weight and your target percentages, and the calculator outputs the exact weight of every ingredient. This is how professional bakers work — the formula is fixed, and the batch size determines everything else. The tool also supports advanced baking concepts. Multi-flour recipes allow you to blend bread flour, whole wheat, rye, spelt, and more, with each flour showing its individual weight and its percentage of the total flour base. Sourdough starter support automatically splits your starter into its flour and water contributions and calculates the true dough hydration accounting for the liquid locked inside the starter. Preferment tracking — for poolish, biga, levain, and sponge — provides the same accurate hydration accounting for pre-fermented doughs. Hydration is the single most important variable in bread baking, and this tool makes it impossible to lose track of. The hydration percentage gauge shows exactly where your dough falls on the spectrum from stiff bagel dough (55–57%) to highly extensible focaccia (80%+), with a human-readable descriptor telling you what to expect from the dough's handling characteristics and crumb structure. Beyond core baker's math, the calculator includes a Desired Dough Temperature (DDT) module. Water temperature is the one variable a baker can control precisely at mixing time, and the DDT formula — water temp equals (DDT × 3) minus flour temperature minus room temperature minus friction — ensures your dough hits the fermentation sweet spot every time. The tool accounts for both hand mixing and stand mixer friction factors. Yeast type conversion is built in as well. If a recipe calls for instant yeast but you only have fresh, the calculator shows all three equivalents simultaneously: instant dry, active dry, and fresh yeast weights for the same leavening power. For bakers who work with enriched doughs containing eggs, milk, butter, honey, or yogurt, the hidden water tracking feature accounts for the moisture these ingredients contribute. Eggs are approximately 75% water; whole milk is 87% water; butter contains about 16% water. Ignoring these contributions systematically underestimates dough hydration, leading to doughs that behave differently than expected. The calculator ships with eight professionally calibrated recipe presets — Basic White Bread, Sourdough, Pizza Dough, Baguette, Brioche, Focaccia, Ciabatta, and Bagel — each reflecting real-world baker's percentage ratios used in professional bakeries. These presets serve as starting points for experimentation or as quick references for understanding how different bread types differ at a fundamental level. Results can be exported to CSV for recipe record-keeping, copied to clipboard for pasting into baking notes, printed for use in the kitchen, or shared via the Web Share API.
Understanding Baker's Percentage
What Is Baker's Percentage?
Baker's percentage is a weight-based notation system where every ingredient in a recipe is expressed as a percentage of the total flour weight. Flour is always 100% — even if multiple flour types are used, their combined weight equals 100%. All other ingredients are expressed relative to that flour total. Because it is based on ratios rather than absolute weights, a recipe written in baker's percentages works identically at any batch size. A 65% hydration sourdough is 65% hydration whether you are making one loaf or one hundred. This is why every professional bakery and bread cookbook uses baker's percentages rather than gram weights for formula documentation.
How Is It Calculated?
The core formula is: Baker's % = (Ingredient Weight ÷ Total Flour Weight) × 100. For flour itself, the percentage is always 100%. For water at 325g with 500g flour, the baker's percentage is (325 ÷ 500) × 100 = 65%. Notice that baker's percentages do not sum to 100% — they frequently exceed 200% when all ingredients are added up. The reverse calculation works as: Ingredient Weight = (Baker's % ÷ 100) × Flour Weight. For recipe scaling by target dough weight, first calculate the Total Dough Percentage (sum of all baker's percentages including flour at 100%), then solve for flour weight: Flour = (Target Dough Weight ÷ Total Dough %) × 100. All other ingredients follow from their percentages.
Why Does It Matter?
Baker's math unlocks several critical capabilities. First, effortless scaling: multiply every ingredient's percentage by the new flour weight and every component adjusts perfectly. Second, recipe comparison: two sourdough formulas can be compared at a glance by looking at their hydration, starter, and salt percentages, regardless of batch size. Third, formula development: professional bakers tweak formulas by adjusting percentages (raise water from 70% to 72%) rather than absolute weights. Fourth, troubleshooting: a dough that is too sticky can be diagnosed as too high hydration — a percentage issue — rather than just 'too much water.' Baker's percentages make the underlying structure of a recipe visible, which is essential for understanding why bread behaves the way it does.
Limitations and Considerations
Baker's percentage has a few nuances to keep in mind. Sourdough starter complicates true hydration calculations because the starter itself contains both flour and water in fixed proportions. A recipe that lists 20% starter at 100% hydration is actually contributing 10% flour and 10% water to the dough — the true dough hydration is higher than the recipe water percentage alone suggests. This calculator handles this automatically via the starter hydration field. Similarly, enriched doughs with butter, eggs, and milk contain significant hidden water that affects dough consistency. The hidden water tracking feature handles this. Finally, baker's percentages say nothing about time, temperature, technique, or ingredient quality — two recipes with identical percentages can produce very different results based on fermentation schedule, flour protein content, and shaping technique.
How to Use the Baker's Percentage Calculator
Choose Your Mode and Units
Select Weight → Percentage mode to convert existing weights into baker's percentages, or Percentage → Weight mode to calculate ingredient weights from baker's percentages. Toggle between metric (grams) and imperial (ounces) using the unit toggle. You can also load one of the eight recipe presets — Basic White Bread, Sourdough, Pizza Dough, Baguette, Brioche, Focaccia, Ciabatta, or Bagel — as a starting point.
Enter Flour and Ingredients
Enter your flour weight in the Flour section — this becomes the 100% base. If you are using multiple flour types (e.g. 80% bread flour + 20% whole wheat), click 'Add flour type' to add rows. Then enter water, salt, yeast, sugar, oil, and sourdough starter amounts. For sourdough, enter the starter hydration percentage so the calculator can accurately split the starter into its flour and water contributions and show true dough hydration.
Add Optional Features
For enriched doughs, click 'Add ingredient' to add butter, eggs, or other enrichments. Enable the 'Track hidden water' toggle to account for moisture in eggs (75%), milk (87%), and butter (16%). For pre-fermented doughs, use the Preferments section to add poolish, biga, levain, or sponge with their individual hydration percentages. Enable the DDT module to calculate the water temperature needed to hit your desired dough temperature at the end of mixing.
Read Results and Export
Results update automatically as you type. The summary table shows each ingredient's baker's percentage alongside its weight. The hydration gauge shows where your dough falls on the hydration spectrum with a plain-language descriptor. The dough composition donut chart visualizes the flour/water/other split. Use the Export CSV button to save your recipe, Copy to paste into notes, or Print to take to the kitchen.
Frequently Asked Questions
Why don't baker's percentages add up to 100%?
In baker's percentage notation, flour is defined as 100% and every other ingredient is a percentage relative to that flour weight — not a percentage of the total dough. A typical sourdough might be: flour 100% + water 72% + starter 20% + salt 2% = 194% total. That 194% is the sum of all baker's percentages, not a percentage in the traditional sense. The system is designed so you can instantly read any ingredient's proportion relative to flour without needing to know the batch size. If two recipes both list water at 65%, they have identical hydration regardless of how much dough they produce.
What is dough hydration and why does it matter so much?
Dough hydration is the baker's percentage of water relative to flour. It is the single most consequential variable in bread baking because it determines how the dough handles, how it ferments, how it bakes, and what the final crumb looks like. Low-hydration doughs (55–65%) are stiff, easy to shape, and produce tight, fine crumbs — ideal for bagels, pretzels, and sandwich loaves. High-hydration doughs (75–85%+) are slack, sticky, require skilled handling techniques like stretch-and-fold, and produce open, irregular crumbs with large holes — ideal for ciabatta, high-hydration sourdough, and focaccia. Most beginner bakers start around 65–70% and work upward as their skills improve.
How does sourdough starter affect true dough hydration?
Sourdough starter contains both flour and water, typically in a 1:1 ratio at 100% hydration — meaning 200g of starter contains 100g flour and 100g water. When you add starter to a recipe without accounting for its flour and water content, you underestimate the true dough hydration. For example, a recipe listing 65% water and 20% starter at 100% hydration has a true hydration of approximately (65+10)/(100+10) = 68%. This calculator automatically splits the starter into its flour and water contributions using the starter hydration percentage you enter, and displays both the recipe hydration and true dough hydration side by side.
What is Desired Dough Temperature (DDT) and how does the formula work?
Desired Dough Temperature (DDT) is the target temperature of your dough immediately after mixing, typically 75–78°F (24–26°C) for most yeasted breads. Fermentation speed is highly sensitive to temperature — dough that is too warm ferments too fast and develops less flavor; dough that is too cold ferments slowly. Since you can control water temperature precisely but not flour or room temperature, the DDT formula calculates the required water temperature: Water Temp = (DDT × 3) − Flour Temp − Room Temp − Friction. The friction factor is approximately 12°F for hand mixing and 22°F for a stand mixer, accounting for the heat generated during mechanical mixing.
How do I scale a recipe to a specific loaf size?
Recipe scaling in baker's percentage is straightforward. First, sum all baker's percentages including flour at 100% to get the Total Dough Percentage (TDP). For a basic bread (flour 100% + water 65% + salt 2% + yeast 1%), TDP = 168%. If you want a 700g loaf, solve for flour: Flour = (Target ÷ TDP) × 100 = (700 ÷ 168) × 100 = 416.7g. Each ingredient is then calculated from its percentage: Water = 65% × 416.7 = 271g, Salt = 2% × 416.7 = 8.3g, and so on. This calculator handles all this automatically — just enter your target dough weight in the Target Dough Weight field and switch to Percentage → Weight mode.
What are preferments and why do bakers use them?
A preferment is a portion of the recipe dough that is mixed and allowed to ferment before the final dough is assembled. Common preferments include poolish (100% hydration, equal flour and water, with a small amount of yeast), biga (stiff Italian preferment at 50–60% hydration), levain (sourdough preferment), and sponge (enriched preferment used in sweet breads). Preferments develop complex flavors through extended fermentation, improve dough extensibility and gas retention, create more open crumb structures, and extend shelf life by producing organic acids. This calculator tracks the flour and water contributions from preferments to accurately calculate your final dough's true hydration.