Short title

Sourdough Baking Calculator & Hydration

Calculate sourdough baking formulas with exact hydration, baker's percentages, levain ratios, and flour blends. Scale loaf yields and proofing schedules easily.

Everyday Artisan
Lbl control deck
2
800 Unit grams
Lbl shape presets
Lbl bake loss14% (Lbl raw dough per loaf: 930 Unit grams)

Lbl bake loss desc

Lbl total grist: 100%
Lbl bread flour80%
Lbl all purpose0%
Lbl whole wheat20%
Lbl dark rye0%
Lbl spelt0%
75%Viscosity open crumb
20%
100% (1:1)
2.0%
4% (Lbl double hydration)
0%
Lbl target d d t
Lbl room temp
Lbl flour temp
Lbl starter temp
Lbl friction factor
Lbl start time
Lbl total dough weight1.86 Unit kg
Lbl true system hydration77.3%
Lbl strike water temp35°C
Tab mix sheet2 Lbl loaves plural @ 930 Unit grams (Lbl expected baked weight: ~800 Unit grams)
Lbl ingredientLbl bakers pctLbl batch weightLbl per loaf
Lbl bread flour80%756 Unit grams378 Unit grams
Lbl whole wheat20%189 Unit grams94 Unit grams
Lbl base flour weight100.0%944 Unit grams472 Unit grams
↳ Lbl main autolyse water72.0%680 Unit grams340 Unit grams
↳ Lbl bassinage water3.0%28 Unit grams14 Unit grams
Tab hydration matrix75.0%708 Unit grams354 Unit grams
Lbl levain starter mass20.0%189 Unit grams94 Unit grams
Lbl salt mass2.0%19 Unit grams9 Unit grams
Lbl total dough weight197.0%1.86 Unit kg930 Unit grams
Lbl true hydration short77.3%
Lbl donut chart title
Lbl total grist:100%
Tab hydration matrix:75%
Lbl levain starter mass:20%
Lbl salt mass:2%

Lbl culinary disclaimer

Technical Reference & Architecture Guide

Sourdough Baking Calculator & Hydration Guide

Calculate sourdough baking formulas with exact hydration, baker's percentages, levain ratios, and flour blends. Scale loaf yields and proofing schedules easily.

Sourdough Baking Calculator & Hydration Guide — Client-Side In-Memory Architecture & Data Flow
Sourdough Baking Calculator & Hydration Guide — Client-Side In-Memory Architecture & Data Flow

Key Parameters & Controls

Total Flour Weight (Base 100.0%)Master Reference Mass (grams / ounces)

The foundational benchmark in baker's mathematics against which all other ingredients are proportionally scaled. In artisan formulas, total flour is always strictly 100.0%, whether baking a single 800g boule or a 50kg production batch.

Default: 1,000 g (100.0%)
Total Dough Hydration (Water Absorption Ratio)Moisture Percentage (% of total flour)

The ratio of total liquid to total flour. Standard artisan thresholds: 65% to 68% for manageable beginner loaves, 72% to 76% for classic open-crumb country boules, and 78% to 85%+ for wild open-crumb sourdough or focaccia.

Default: 75.0% (Classic Country Crumb)
Active Levain Inoculation RateFermentation Seed Percentage (% of flour)

The proportion of ripe, active sourdough starter added to the mix. Standard safe range is 15% to 25%. Inoculations below 10% risk sluggish acidification and enzymatic dough breakdown, while exceeding 30% accelerates bulk fermentation too quickly and risks over-proofing.

Default: 20.0% (200 g per 1,000 g flour)
Sourdough Starter Hydration (Feeding Ratio)Starter Moisture Ratio (% water to flour)

The hydration at which the mother starter is maintained. A standard 1:1 feeding creates a 100% hydration liquid starter (50% flour, 50% water). Stiff levains (50% to 60%) promote acetic acid notes, whereas liquid starters (100% to 125%) favor lactic sweetness.

Default: 100.0% (1:1 Feeding: 50% Flour / 50% Water)
Fine Sea Salt ConcentrationGluten Structure & Fermentation Regulator (% of flour)

Essential mineral regulator that tightens gluten strands and modulates yeast fermentation rate. Gold standard artisan range is 1.8% to 2.2% (typically 2.0%). Concentrations below 1.5% yield pale crust and slack, sticky dough, while above 2.5% retards fermentation excessively.

Default: 2.0% (20 g per 1,000 g flour)
Bassinage Reserved Water AllocationStaged Hydration Split (% of recipe water)

The fraction of recipe water (typically 4% to 8%) withheld during the initial autolyse and kneaded into the dough alongside salt. Bassinage allows early gluten cross-linking in a firmer dough without drowning developing gluten chains.

Default: 4.0% to 5.0% Reserved for Salt Stage
Multi-Grain Blend Absorption OffsetGrain Hydration Compensation Factor (% absorption)

Adjustment factor accounting for whole grain bran and fiber moisture uptake. Whole wheat flour absorbs 10% to 15% more water than refined white flour, and dark rye absorbs up to 20% more due to pentosan gums, requiring hydration compensation to maintain dough feel.

Default: 80% Bread Flour / 20% Whole Wheat
Ambient Bulk Fermentation TemperatureThermal Kinetic Benchmark (°C / °F)

The ambient temperature of the dough proofing environment. Microbial activity follows Arrhenius kinetics: optimal wild yeast and lactic acid bacteria activity occurs between 24°C and 27°C (75°F to 80°F), with fermentation speed halving near 18°C (64°F).

Default: 24°C / 75°F (Standard Proofing Benchmark)

Pro Tips & Best Practices

The Pentosan Trap: Why Whole Wheat and Rye Demand Higher Hydration but Shorter Bulk

Whole wheat and dark rye flours contain sharp bran flakes and water-loving pentosan gums (arabinoxylans) that absorb 10% to 20% more water than refined white flour. However, while whole-grain dough feels firmer at 78% hydration than white dough at 72%, the bran mechanically punctures developing gluten sheets, and the higher enzymatic and mineral content dramatically speeds up fermentation. When baking with more than 30% whole grain, increase hydration by 4% to 6%, extend the initial autolyse to 45 minutes, but shorten bulk fermentation by 30 to 60 minutes to prevent premature gluten collapse.

The Two-Stage Bassinage Method for Taming 75%+ Hydration Doughs

Adding all water during the initial autolyse creates a soupy emulsion that prevents gluten strands from knitting together, leaving you with a sticky mess. For any dough at or above 75% hydration, reserve 4% to 6% of the recipe water. Mix the remaining 70% water with the flour for a 30 to 60-minute autolyse so gluten forms effortlessly in a firmer matrix. Then, add the active levain, salt, and slowly drizzle in the reserved bassinage water during your first stretch-and-fold session.

Arrhenius Reaction Kinetics: Why Ambient Temperature Overrides the Clock

Never follow a fixed sourdough timer like 'bulk ferment for 5 hours.' Wild yeast (Candida humilis) and lactic acid bacteria (Fructilactobacillus sanfranciscensis) double their metabolic rates with roughly every 8°C (15°F) temperature increase. A dough that requires 6 hours to ferment at 20°C (68°F) will fully peak in under 3.5 hours at 26°C (79°F). Always track percentage dough rise in a straight-sided translucent aliquot jar (aim for 35% to 50% rise depending on dough temperature) rather than watching the clock.

The Starter Hydration Blindspot: How 1:1 Feedings Skew Your True Water Ratio

Most amateur bakers assume that adding 200g of sourdough starter to 1,000g of flour and 700g of water yields a 70% hydration dough. However, because a standard 100% hydration starter consists of 100g flour and 100g water, your true total flour is 1,100g and total water is 800g, making the true hydration 72.7%. When using higher starter inoculation (25% to 30%) or stiff 50% levains, this discrepancy shifts your hydration by 3% to 5%, completely altering crumb structure if not calculated through a true baker's equation.

The Desired Dough Temperature (DDT) Formula for Predictable Fermentation Schedules

Professional bakeries eliminate seasonal proofing variation by adjusting mix water temperature to achieve an exact final dough temperature between 24°C and 26°C (75°F to 78°F). Calculate required water temperature using the formula: Water Temp = (3 × Target DDT) - (Room Temp + Flour Temp + Friction Factor). For gentle hand-mixing, assume a friction factor of 1°C to 2°C (2°F to 4°F); for spiral or planetary stand mixers, allocate 5°C to 8°C (10°F to 15°F) to prevent dough overheating and yeast shock.

Common Gotchas & Troubleshooting

⚠️Dough turns into a slack, unshapeable soup with no surface tension during bulk fermentation

This is almost always caused by enzymatic gluten breakdown from over-fermentation or excessive hydration for your flour's protein quality. Sourdough lactic acid bacteria produce acids that activate proteolytic enzymes, which literally digest the gluten matrix if bulk ferment extends too long. Solution: Check dough pH or reduce bulk fermentation time by 45 minutes, drop target hydration by 4%, perform 4 sets of gentle coil folds during the first 2 hours, and ensure your base white flour has at least 12.5% protein.

⚠️Dense, gummy bottom crumb with large wild cavities near the top crust (The 'Flying Crust' Syndrome)

This classic defect is caused by under-fermentation combined with an unevenly heated Dutch oven. Under-fermented dough lacks distributed micro-bubbles; when hit with oven heat, large pocketed steam bursts toward the top crust while the dense bottom fails to aerate. Solution: Allow dough to rise until it exhibits domed edges, aerated jiggle, and a 35% to 50% volume expansion before shaping, and preheat your heavy cast-iron Dutch oven at 245°C (475°F) for at least 45 minutes prior to loading.

⚠️Loaf spreads flat like a frisbee in the Dutch oven with zero oven spring and ragged ear tearing

Flat spreading results from weak surface tension during final shaping, inadequate banneton dusting, or over-proofing. Solution: Use a bench scraper to create tight circular surface tension during pre-shaping, rest 20 minutes, then stitch into a taut batard or boule. Dust your proofing basket with a 50/50 blend of white rice flour and bread flour (rice flour contains no gluten and prevents sticking completely). Retard shaped loaves overnight in the refrigerator at 3°C to 5°C (37°F to 41°F) to solidify the dough fats and starch before scoring.

⚠️Excessively sour, acidic bread with pale crust and compromised crumb elasticity

Excessive sourness and pale crust occur when acetic acid over-accumulates from sluggish, cold, or overly prolonged room-temperature fermentation, which consumes all available residual sugars needed for Maillard crust browning. Solution: Feed your mother starter at a 1:4:4 or 1:5:5 ratio to dilute accumulated acid before building your levain, inoculate at 20% to 22%, bulk ferment at a warmer 25°C to 26°C (77°F to 79°F) to favor milder lactic acid over pungent acetic acid, and transfer to a cold retarder (3°C) promptly after shaping.

Frequently Asked Questions

How do you calculate true sourdough hydration including the starter?▼

To calculate true sourdough hydration, you must account for the flour and water contained inside the starter culture using the formula: True Hydration % = ((Added Water + Starter Water) / (Added Flour + Starter Flour)) × 100. For example, if you combine 500g bread flour, 350g water, and 100g of a standard 100% hydration starter (which contains 50g flour and 50g water), your true total flour is 550g and true total water is 400g. Your actual hydration is (400 / 550) × 100 = 72.7%, which is 2.7% wetter than the apparent 70% added water ratio.

What is the best sourdough hydration percentage for beginners?▼

The recommended sweet spot for beginner sourdough bakers is 65% to 68% true hydration. At 65% to 68%, standard unbleached bread flour (12.0% to 12.7% protein) absorbs water completely without turning wet or sticky on the work surface. This moisture range provides sufficient gluten elasticity for clean hand-kneading, tight shaping tension, and reliable vertical oven spring without clinging to hands or proofing bannetons.

What is the difference between Baker's Percentage and True Hydration?▼

Baker's Percentage expresses every recipe ingredient as a percentage relative solely to total added flour (Total Flour = 100.0%), meaning total recipe percentages always exceed 100% (typically 175% to 185%). True Hydration is the actual physical moisture percentage of the finished dough, factoring in both the added water and the moisture hidden inside the levain culture. Baker's percentage simplifies scaling batch sizes, while true hydration dictates dough rheology and crumb openness.

How do you calculate sourdough recipe ingredients from a target loaf weight?▼

To scale a sourdough recipe backward from a target finished dough weight, sum all the baker's percentages: Total Percentage Sum = 100% (Flour) + Hydration% + Levain% + Salt% + Inclusion%. Then divide your target dough weight by (Total Percentage Sum / 100) to find required flour. For example, for an 800g loaf at 75% hydration, 20% levain, and 2% salt, the sum is 197%. Base flour = 800 / 1.97 = 406.1g; water = 406.1 × 0.75 = 304.6g; levain = 406.1 × 0.20 = 81.2g; and salt = 406.1 × 0.02 = 8.1g.

How does room temperature affect sourdough bulk fermentation time?▼

Sourdough fermentation velocity responds exponentially to ambient temperature following biological Q10 kinetics. At 21°C (70°F), bulk fermentation typically requires 5.5 to 6.5 hours with a 20% levain inoculum. At 26°C (79°F), the exact same recipe will reach full fermentation in just 3 to 3.5 hours. At 28°C (82°F) or above, fermentation accelerates dramatically, increasing the risk of acid-induced gluten breakdown. Always adjust your bulk proofing time according to ambient dough temperature.

How much sourdough starter should you use per loaf of bread?▼

Standard artisan formulas call for 15% to 25% active levain based on total flour weight, which equates to 80g to 120g of ripe sourdough starter for a standard 800g to 900g loaf (based on ~450g to 500g flour). Use 15% to 18% in warm summer kitchens (above 25°C / 77°F) to prevent over-fermentation, and increase to 20% to 25% in cooler winter kitchens (below 21°C / 70°F) to ensure timely microbial activity.

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