Sourdough Hydration Calculator (Baker's %)
Presets title
Lbl measurement regime
Lbl calculation mode

Card title flour

500 g
500 g
g
Lbl flour varietiesLbl composite protein: 12.8%
Flour bread80%
Flour whole wheat15%
Flour rye5%
Flour spelt0%

Card title hydration

350 g
100% water, zero fat or solids
350 g
g

Card title starter salt

100 g
18.2% Lbl inoculation rate
100%
Note standard11
2.0%(11 g)
Salt lowSalt idealSalt high

Card title batch thermal

Kpi true hydration
72.7%
Lbl apparent: 70.0%
+2.7% Lbl from starter
Kpi total dough
961 g
1 Lbl loaf singular @ 961 g
Lbl approx831 g Lbl baked
Kpi total flour
550 g
500 g + 50 g Lbl starter tag
12.8% Lbl protein
Kpi water temp
32.2°C
Lbl target ddt short: 25.6°C
Lbl approx4.4 Unit hours Lbl bulk window
Alert starter decouple titleAlert starter decouple desc2.7%.

Title boule visualizer

Porosity artisan
100g (18%)72.7% Badge true

Title scale sheet

Desc scale sheet

Col stepCol ingredientCol add weightCol cumulativeCol bakers pct
#0Place mixing bowl on scale & press TARE—0 g—
#1Add Main Flour Blend (Bread, Wheat, Rye, Spelt)500 g500 g90.9%
#2Add Direct Liquid (Pure Water (100% Moisture))350 g850 g63.6%
#3Add Ripe Active Sourdough Starter (100% Hydration)100 g950 g18.2%
#4Add Fine Sea Salt11 g961 g2.0%

Milestones title

Technical Reference & Architecture Guide

Sourdough Hydration Calculator (Baker's %) Guide

Calculate precise sourdough hydration, baker's percentages, and water-to-flour ratios. Factor starter hydration, multi-grain flours, salt, and batch loaf yields.

Sourdough Hydration Calculator (Baker's %) Guide — Client-Side In-Memory Architecture & Data Flow
Sourdough Hydration Calculator (Baker's %) Guide — Client-Side In-Memory Architecture & Data Flow

Key Parameters & Controls

Total Flour Basis (Baker's 100% Mass Benchmark)Gravimetric Mass (Grams / Ounces)

The cumulative sum of all dry flour in the formulation, incorporating directly weighed flour plus the flour fraction inside the sourdough starter. In professional baker's percentages, total flour is strictly designated as the 100% baseline against which all liquids, salt, and levain are mathematically proportioned.

Default: 500 to 1,000 g (typical artisan home loaf)
True Total Dough Hydration PercentageGravimetric Baker's Ratio (% of Total Flour)

The true ratio of all liquid mass (direct water plus starter water) divided by total flour mass. Beginner dough ranges from 65% to 70%; standard artisan sourdough thrives at 72% to 78%; advanced open-crumb loaves push to 80% to 85% only when paired with high-protein flour (12.5% or higher) and bassinage.

Default: 72.0% to 75.0% (artisan sweet spot)
Sourdough Starter Hydration (Levain Water Ratio)Baker's Culture Ratio (% Water to Flour in Starter)

The ratio of water to flour fed to the wild yeast culture. Standard liquid starter is 100% hydration (equal parts flour and water by mass: 50% flour, 50% water). Italian Lievito Madre is a stiff culture maintained at 45% to 50% hydration, while liquid levain can reach 125%. Non-100% starters significantly shift true dough hydration.

Default: 100.0% (standard 1:1 feeding ratio)
Starter Inoculation Rate (Preferment Percentage)Baker's Ratio (% of Total Flour Weight)

The weight of ripe starter expressed as a percentage of total flour weight. Standard commercial inoculations span 15% to 25% (20% standard), driving bulk fermentation times of 4 to 6 hours at 78°F (25.5°C). Inoculations below 10% extend fermentation for slow overnight bulking; above 30% accelerate acid accumulation and weaken gluten integrity.

Default: 20.0% (standard artisan inoculation)
Baker's Salt Percentage (Sodium Chloride Concentration)Baker's Ratio (% of Total Flour Weight)

The proportion of fine sea salt relative to total flour mass. Salt tightens gluten proteins through ionic interaction, regulates wild yeast and lactic acid bacteria (LAB) fermentation kinetics, and enhances crumb flavor. Professional standards mandate 1.8% to 2.2% (typically 2.0%); dropping below 1.5% causes slack, sticky dough, while exceeding 2.5% severely suppresses yeast activity.

Default: 2.0% (10 g salt per 500 g flour)
Flour Protein Content & Water Absorption CapacityProtein Mass Fraction (% Crude Protein)

The percentage of gluten-forming storage proteins (gliadin and glutenin) in the flour blend. All-purpose flour (10.0% to 11.5% protein) maxes out around 68% hydration; bread flour (12.5% to 13.5% protein) easily binds 75% to 78% water; whole wheat (13.5% to 15.0% protein) absorbs 80%+ water due to hygroscopic bran pentosans, though unsoftened bran physically slices developing gluten strands.

Default: 12.7% (standard unbleached bread flour)

Pro Tips & Best Practices

The Starter Water Trap: True Hydration vs Apparent Hydration

Never calculate hydration using only direct water and flour in the mixing bowl. If you combine 500g flour and 350g water (70% apparent hydration) and add 150g of 100% hydration starter, you are actually introducing 75g more water and 75g more flour. Your true hydration is (350 + 75) / (500 + 75) = 425 / 575 = 73.91%—nearly 4 percentage points wetter than you planned. This hidden moisture is the #1 reason beginner dough turns into an unmanageable sticky puddle.

The Bassinage (Double Hydration) Technique for High-Water Dough

When mixing dough above 75% hydration, never dump 100% of the water in at the initial mix. Drowning dry flour prevents gliadin and glutenin molecules from colliding and linking into an elastic gluten matrix. Withhold 3% to 5% of the recipe water (the bassinage water). Mix the dough to achieve full initial gluten cohesion during a 30 to 45 minute autolyse, then slowly incorporate the reserved water alongside the salt during initial stretch-and-folds.

The Bran Pentosan Thirst: Whole Grain Water Absorption Rule

Whole wheat and dark rye contain large amounts of arabinoxylans (pentosan polymers) that absorb 200% to 300% of their own weight in water—double that of pure gluten proteins. However, this bound water does not develop dough elasticity, and sharp bran shards physically slice developing gluten strands. When substituting 20% or more whole grain flour into a white recipe, increase total water by 5% to 8% and extend autolyse to 60 minutes to allow the coarse bran to fully soften.

Desired Dough Temperature (DDT) and the Friction Factor Equation

Fermentation speed is governed by dough temperature, not clock time. The professional target for sourdough bulk fermentation is 76°F to 78°F (24°C to 26°C). Calculate exact water temperature using the DDT formula: Water Temp = (3 * Target DDT) - (Flour Temp + Room Temp + Friction Factor). For hand kneading, assume a friction factor of 0°F to 2°F; for a stand mixer or spiral kneader, add 5°F to 8°F of mechanical heat friction. Using cold tap water without calculating DDT can triple fermentation time.

Common Gotchas & Troubleshooting

⚠️Dough Is Slack, Soupy, and Spreads Flat (Over-Hydration vs Over-Fermentation)

If dough refuses to hold tension and puddles on the bench, diagnose whether the fault is water volume or microbial degradation. Check your flour's protein: all-purpose flour cannot support 78% hydration without adding vital wheat gluten or switching to 12.7%+ bread flour. If hydration is reasonable (<=72%) but the dough still liquefies and tears easily, the culprit is enzymatic proteolysis caused by over-fermentation (excess lactic and acetic acid breaking down the gluten network). Reduce bulk fermentation time or drop dough temperature to 74°F (23°C).

⚠️Dense, Gummy Crumb with Giant Upper Cavities (The 'Fool's Crumb' Phenomenon)

A crumb featuring a dense, heavy bottom with several massive cavernous holes near the upper crust is not an airy artisan crumb—it is the classic 'Fool's Crumb' caused by severe under-fermentation, often mistaken for over-hydration. Under-developed wild yeast creates explosive pockets of carbon dioxide that tunnel upward through weak, under-proofed dough. Extend bulk fermentation until the dough increases in volume by 30% to 50% (at 78°F), exhibits domed edges, and shows visible bubbles under the surface before shaping.

⚠️Dough Sticking Severely to Hands and Proofing Banneton Baskets

Excess stickiness in high-hydration dough (75%+) usually results from under-developed surface gluten tension and improper dusting flours. Never flour your hands with raw white flour when handling wet dough—wet your hands with water instead (surface tension prevents sticking). For banneton proofing baskets, never use regular wheat flour (which dissolves into wet gluten and glues the loaf to the rattan). Dust baskets exclusively with a 50/50 blend of white rice flour and bread flour; rice flour is gluten-free and creates an impenetrable non-stick release barrier.

⚠️Tough, Leathery Crust and Lack of Blistering Oven Spring

A dull, pale, leathery crust with no ear (bloom) or blistered micro-bubbles indicates moisture loss during the first 20 minutes of baking. Without saturated steam, the loaf surface hardens prematurely, halting oven spring and trapping steam inside as a gummy crumb. Bake inside a preheated heavy cast iron Dutch oven or combo cooker at 450°F to 475°F (230°C to 245°C) with the lid sealed tight for the first 20 to 25 minutes to trap natural dough steam, then remove the lid for 15 to 20 minutes to caramelize the crust.

Frequently Asked Questions

How do you calculate sourdough hydration percentage?▼

To calculate true sourdough hydration, divide total water weight by total flour weight and multiply by 100, ensuring you include the water and flour inside your sourdough starter. The exact formula is: Hydration % = [(Direct Water + Starter Water) / (Direct Flour + Starter Flour)] * 100. For example, if you use 500g direct flour, 350g direct water, and 100g of 100% hydration starter (which contains 50g flour and 50g water), Total Flour is 550g and Total Water is 400g. Your true hydration is (400 / 550) * 100 = 72.73%, not 70%.

What is a good sourdough hydration percentage for beginners?▼

A hydration of 65% to 70% is the ideal sweet spot for beginners because the dough remains cohesive, holds its shape during shaping, and does not stick aggressively to hands or work surfaces. At 68% hydration with standard unbleached bread flour (12% protein), gluten forms easily with minimal stretch-and-folds, producing a crisp crust and an even, open crumb. Avoid popular 78% to 85% high-hydration social media recipes until you have mastered dough tension and shaping with lower-hydration doughs.

What is the difference between baker's percentage and true hydration?▼

Baker's percentage is a universal scaling method where the total flour weight is always designated as 100%, and all other ingredients (water, salt, starter) are calculated as a percentage of that flour mass. True hydration specifically accounts for both the liquid and flour contributed by the preferment (starter), whereas amateur 'apparent' baker's percentage ignores the starter's composition. If a recipe calls for 20% starter at 100% hydration, it adds equal 10% flour and 10% water increments that shift your true hydration ratio.

How do you fix sourdough dough that is too wet or sticky?▼

To fix dough that is too wet to shape, do not dump raw dry flour into the dough, as unhydrated flour creates hard, unmixed lumps and disrupts salt-yeast ratios. Instead, perform 2 to 3 coil folds spaced 20 minutes apart with wet hands to build gluten structure, or use the 'bassinage recovery' technique by letting the dough rest uncovered for 15 minutes to allow surface moisture to evaporate. For extreme over-hydration, transfer the dough into an oiled loaf tin or cast-iron skillet to bake as a high-hydration sourdough focaccia or sandwich pan loaf.

How does whole wheat or rye flour affect sourdough hydration?▼

Whole wheat and rye flours require 5% to 10% more water than white bread flour because coarse bran particles and arabinoxylans (pentosan fibers) absorb significantly more liquid. However, this extra water does not produce a wetter-feeling dough; the bran traps the water like a sponge while mechanically cutting gluten strands. If your recipe includes 20% to 50% whole grain flour, increase your base hydration from 70% to 75-78% and extend your autolyse to at least 45 minutes to soften the bran.

How do you calculate water temperature for sourdough using DDT?▼

Calculate water temperature using the Desired Dough Temperature (DDT) formula: Water Temp = (3 * Target DDT) - (Flour Temp + Room Temp + Mixer Friction Factor). The optimal target DDT for artisan sourdough fermentation is 76°F to 78°F (24°C to 26°C). For example, if your target DDT is 78°F (3 * 78 = 234°F), your room is 70°F, your flour is 68°F, and hand kneading adds 2°F of friction: Water Temp = 234 - (70 + 68 + 2) = 94°F (34.4°C). In warmer months, this formula will often require cold tap or ice water.

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