What is hydration and how does it dictate crumb structure?

Hydration is the ratio of liquid water to flour. Lower hydration (50% to 62%) yields stiff, easily shaped doughs with dense, uniform crumb (bagels, sandwich loaves). Higher hydration (75% to 85%) produces soft, elastic doughs with thin gluten walls and large, irregular air pockets (open crumb ciabatta and sourdough).

How does a 100% hydration sourdough starter affect total dough hydration?

A standard 100% hydration sourdough starter is fed with equal parts flour and water by weight. If your recipe calls for 100g of starter, it contains exactly 50g of flour and 50g of water. True precision requires factoring both halves into your overall recipe totals.

Why is salt almost universally set to 2% in bread formulas?

Two percent salt creates the optimal flavor balance between savory saltiness and natural cereal grain sweetness. Chemically, sodium ions strengthen glutenin proteins, creating a firmer gluten matrix and preventing over-fermentation by commercial yeast.

What is the ratio substitution between instant dry yeast and sourdough levain?

While commercial dry yeast is dosed at 0.5% to 1.5% due to its concentrated culture density, wild-fermented sourdough levain is typically used at 15% to 25% (standard 20%) of total flour weight.

What is the formula to reverse-engineer flour weight from total dough weight?

Base Flour Weight = Target Total Dough Weight / (Total Baker's % / 100). For example, to make 1,500g of dough with a total baker's sum of 175%, calculate 1,500 / 1.75 = 857.1g of flour.

Baker's Percentage & Sourdough Dough Scaler

Scale bread recipes using 100% flour baseline baker's percentages, sourdough levain hydration decoupling, and loaf portioning.

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Baker's Percentage & Dough Scaler

Scale bread recipes using 100% flour baseline and sourdough levain decoupling

Classic Bread Formula Presets

Scaling Baseline

Total Dough (g)

Loaves / Portions

Baker's Percentages (%) Settings (Flour = 100%)

Water (Hydration %)

Salt (%)

Levain (%)

Yeast (%)

Sugar (%)

Butter/Fat (%)

Scaled Ingredient Formula (Grams)

Total Dough Mass

1000 g

2 loaves @ 500g each

Base Flour (100%)

507.6 g

Sum of percentages: 197.0%

Decoupled True Hydration

77.3%

Reflecting 1:1 starter moisture

Ingredient	Baker's %	Required Mass (g)	Per Loaf (g)
Flour (Base)	100.0%	507.6 g	253.8 g
Water (Hydration)	75%	380.7 g	190.4 g
Salt (Sea Salt)	2.0%	10.2 g	5.1 g
Sourdough Levain (100% Hyd)	20%	101.5 g	50.8 g

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Baker's Percentage & Sourdough Dough Scaling Guide

In professional baking and artisan sourdough craft, the global standard measurement system is 'Baker's Percentage' (or Baker's Notation), where total dry flour weight is always defined as exactly 100.0%.

Unlike standard culinary recipes where all ingredients sum to 100%, baker's math expresses water (hydration %), salt %, yeast or sourdough starter (levain %), sugar %, and fat % relative to flour. This mathematical formulation allows bakers to seamlessly scale a formula from a single 500g loaf to a commercial run of 1,000 baguettes while preserving dough hydration, crumb structure, and flavor balance.

This calculator provides two-way scaling (scaling down from total target dough mass or scaling up from available flour on hand), complete with sourdough levain hydration decoupling and classic dough presets (baguette, Neapolitan pizza, pain de mie, sourdough, brioche).

100% Flour Baseline Baker's Mathematics Formulation

The mathematical deduction deriving baseline dry flour mass from total dough weight using composite baker's percentage sums.

Baker's Percentage Scaling MathematicsMathematical Formulation

Total Baker's Percentage (%) = 100% (Flour) + Hydration% + Salt% + Yeast/Levain% + Enrichments% Base Flour Mass (g) = Target Total Dough Weight (g) / (Total Baker's % / 100) Ingredient Mass (g) = Base Flour Mass (g) × (Ingredient Baker's % / 100) * Sourdough Levain (100% Hydration) Decoupling: - Flour contributed by levain = Levain Mass / 2 - Water contributed by levain = Levain Mass / 2

Because flour is fixed at 100%, total baker's percentages exceed 100% (typically 165% to 200%). Dividing target batch dough mass by the sum percentage instantly isolates the required flour mass.

Scaling a batch for two 500g artisan sourdough boules (1,000g total dough) at 75% hydration, 20% levain, and 2% salt

Sum Total Baker's Percentage100% + 75% + 20% + 2%197.0% total

Calculate Base Flour Mass1,000 g / 1.97507.6 g

Calculate Water (75% Hydration)507.6 g × 0.75380.7 g

Calculate Sourdough Levain (20%)507.6 g × 0.20101.5 g

Calculate Sea Salt (2%)507.6 g × 0.0210.2 g

👉 Weighing 508g flour, 381g water, 102g active levain, and 10g salt yields exactly 1,000g of sourdough dough.

Classic Bread Varieties Baker's Percentage Reference Table

Standard international formulations based on 100% flour weight

Bread Style	Flour Base	Hydration (Water)	Salt %	Yeast / Levain	Enrichments / Fat	Working Difficulty
Traditional French Baguette	100.0%	68.0% ~ 72.0%	2.0%	Instant Yeast 0.8%	None (Lean Dough)	Intermediate (Shaping)
Artisan Sourdough Boule	100.0%	75.0% ~ 82.0%	2.0%	Levain 20.0%	None (Long Cold Ferment)	Advanced (Coil Folds)
Neapolitan Pizza Dough	100.0%	60.0% ~ 65.0%	2.8% ~ 3.0%	Fresh Yeast 0.2%	0~2% Olive Oil optional	Beginner (Elastic Stretch)
Focaccia Genovese	100.0%	80.0% ~ 85.0%	2.2%	Dry Yeast 1.2%	Olive Oil 8.0% ~ 10.0%	Beginner (Dimpled Pan)
Sandwich Bread (Pain de Mie)	100.0%	65.0% (Milk)	1.8%	Instant Yeast 1.2%	Sugar 8.0% / Butter 8.0%	Beginner (Soft Crumb)
French Brioche	100.0%	Eggs/Milk 55.0%	2.0%	Instant Yeast 2.0%	Butter 50.0% / Sugar 12.0%	Advanced (Cold Emulsion)
New York Bagels	100.0%	53.0% ~ 56.0%	2.0%	Instant Yeast 0.8%	Barley Malt 2.0% (Boiled)	Intermediate (Stiff Dough)
Artisan Ciabatta	100.0%	80.0% ~ 88.0%	2.0%	Instant Yeast 1.0%	Olive Oil 3.0%	Intermediate (Open Crumb)

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How to Use

11. Select Bread Preset or Enter Ratios

Choose a classic profile (Sourdough 75%, Neapolitan Pizza 65%, Baguette 70%, Brioche, Bagel) or customize your own ratios.

22. Choose Scaling Basis (Total Dough vs Flour)

Enter desired final dough mass (number of loaves × loaf weight) or specify dry flour available in your pantry.

33. Adjust Levain & Enrichment Factors

Fine-tune hydration %, salt (typically 2%), commercial yeast or 100% hydration sourdough levain %, and butter/sugar.

44. Review Scaled Recipe Weights

Read exact gram weights for flour, water, salt, and levain, then copy formulas to your baking journal.

Baking Scale-Up & Adaptation Scenarios

From clearing remaining pantry flour to commercial pizzeria batch calculations

Home Baker: Using Remaining 420g Flour Bag

Treating 420g flour as 100% at 70% hydration instantly yields 294g water, 8.4g salt, and 3.4g yeast with zero leftover flour.

Pizza Night: Eight 250g Dough Balls (2,000g)

Setting target dough to 2,000g with Neapolitan specs (65% water, 2.8% salt, 0.2% yeast = 168%) requires 1,190g flour, 774g water, and 33g salt.

Sourdough Levain Moisture Decoupling

Adding 160g of 100% hydration levain introduces 80g of flour and 80g of water, allowing bakers to adjust mixing water for target hydration.

Commercial Catering: 100 Dinner Rolls

Scaling 100 rolls at 45g each (4,500g total dough) through an enriched formula (184% sum) isolates bulk flour at 2,445g.

💡 Artisan Baker Dough Management Rules

✓ Employ the Autolyse Process

Resting flour and water together for 30-60 minutes before adding salt triggers enzymatic gluten formation, cutting knead time in half.

✓ Never Omit the 2% Salt Standard

Salt tightens the gluten mesh and regulates yeast fermentation rate; unsalted dough is sticky, slack, and ferments uncontrollably.

✓ Inspect Flour Protein (W-Index)

High hydration formulas (75%+) require bread flour with at least 12.5% to 14.0% protein content to support gas retention.

⚠️ Common Pitfalls & Mistakes to Avoid

❌ Confusing Baker's Percentages with Total Weight Percentages

✅ Remember that the sum of baker's percentages always exceeds 100% because flour is the sole 100% anchor.

❌ Pouring 100% of Water at Once in Humid Weather

✅ Flour absorbs atmospheric moisture during humid months; hold back 5% of calculated water and add it incrementally (bassinage).

❌ Substituting Active Dry Yeast 1:1 with Fresh Yeast

✅ Fresh cake yeast contains roughly 70% moisture; use 2.5 to 3 times the mass of instant dry yeast.

Frequently Asked Questions (FAQ)

Expert answers to the most frequently asked questions and edge cases.

6 Q&As

In baker's percentages, flour is fixed as the 100% baseline, and every other ingredient is expressed as a relative proportion of that flour weight. For example, a formula with 100g flour, 70g water, 2g salt, and 1g yeast totals 173%. This enables immediate formula scaling regardless of batch volume.

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