Levain Calculator

Precise Sourdough Starter Calculations

Levain Calculator

Calculate the precise amounts of flour, water, and starter needed to build your levain for sourdough baking. Input your desired total levain weight and your preferred hydration and flour ratio.

Levain Calculation Breakdown

Levain Component Weights

Component	Weight (g)
Mature Starter	N/A
Flour (Total)	N/A
Water	N/A

Levain Component Proportions

What is a Levain?

A levain, often referred to as a sourdough starter or preferment, is a live culture of wild yeast and bacteria. It’s a cornerstone of traditional sourdough baking, acting as the primary leavening agent and imparting unique flavors and textures to bread. Unlike commercial yeast, levain develops organically from flour and water, capturing the microflora present in its environment. Building a levain involves feeding a small amount of mature starter with fresh flour and water, allowing it to ferment and become active before being incorporated into your dough. Understanding how to create and manage a levain is crucial for consistent sourdough results. A well-maintained levain is bubbly, fragrant, and has doubled or tripled in volume after feeding, indicating it’s ready to leaven bread.

Who should use it? Sourdough bakers, from beginners looking to transition from commercial yeast to experienced bakers seeking consistent flavor profiles, will find a levain indispensable. It’s for anyone who appreciates the complexity, digestibility, and artisanal quality that sourdough offers. If you’re looking to achieve that signature sourdough tang, improved texture, and longer shelf life for your bread, mastering the levain is key.

Common misconceptions: One common misunderstanding is that a levain is overly complicated or requires constant, intensive care. In reality, once established, a levain can be maintained with relatively simple feeding schedules. Another misconception is that all levains taste intensely sour. While tanginess is a characteristic, the sourness can be controlled through factors like hydration, feeding ratios, and fermentation time. Furthermore, people sometimes confuse ‘levain’ with the entire sourdough starter; technically, the levain is a specific portion of the starter used for a particular bake.

Levain Formula and Mathematical Explanation

The core of calculating a levain recipe lies in accurately determining the weights of starter, flour, and water based on three key parameters: the total desired weight of the levain, the desired hydration level, and the ratio of mature starter to the total flour content.

Step-by-Step Derivation

1. Define Total Weight: This is the final amount of levain you want for your bake (e.g., 100g).
2. Define Hydration: This is the ratio of water to flour in the levain, expressed as a percentage. 100% hydration means equal weights of water and flour.
3. Define Starter Ratio: This is the ratio of mature starter (which itself contains flour and water) to the total flour that will be added for this specific levain build. Common ratios are 1:1, 1:2, 1:3, etc., meaning 1 part starter to X parts flour.
4. Calculate Total Parts: For a given hydration and starter ratio, we can determine the total ‘parts’ that make up the levain.
   If H = Hydration (as a decimal, e.g., 1.0 for 100%) and SR = Starter Ratio (e.g., 1 for 1:1, 2 for 1:2),
   The total flour in the levain is conceptually 1 part (from the starter) + SR parts (added flour).
   The total water in the levain is conceptually H parts (from the starter) + H * SR parts (added water).
   Total Weight = (Flour from starter + Water from starter) + (Added Flour + Added Water)
   Let ‘F’ be the total flour weight and ‘W’ be the total water weight.
   Total Weight = F + W
   Since W = F * H (by definition of hydration), Total Weight = F + F*H = F * (1 + H).
   Therefore, F = Total Weight / (1 + H).
   And W = F * H.
   Now, let’s relate this to the starter ratio. The starter itself is typically 100% hydration (equal flour and water). If the starter ratio is 1:SR, then for every 1 part starter, we add SR parts flour.
   The total flour needed is composed of the flour *in* the starter plus the *added* flour.
   If we use ‘S’ grams of starter, and the starter is 50% flour (by weight, assuming 100% hydration starter), then Flour in Starter = S/2.
   Added Flour = SR * Flour in Starter = SR * (S/2).
   Total Flour (F) = Flour in Starter + Added Flour = S/2 + SR*(S/2) = (S/2) * (1 + SR).
   We know F = Total Weight / (1 + H).
   So, Total Weight / (1 + H) = (S/2) * (1 + SR).
   Solving for S (Starter weight): S = [2 * Total Weight] / [(1 + H) * (1 + SR)].
   This is a bit complex. A simpler approach for common scenarios (like 100% hydration starter):
   Let Total Levain Weight = T
   Let Hydration = H (decimal)
   Let Starter to Flour Ratio = 1:SR (meaning added flour is SR times the flour in the starter)
   Assume starter is 100% hydration (50% flour, 50% water by weight).
   Let F_added = weight of added flour
   Let W_added = weight of added water
   Let S = weight of starter
   F_added = SR * (Flour in S)
   W_added = H * F_added
   Flour in S = S / 2
   Water in S = S / 2
   T = S + F_added + W_added
   T = S + (SR * S/2) + H * (SR * S/2)
   T = S * [1 + SR/2 + H*SR/2]
   S = T / [1 + SR/2 + H*SR/2]
   This formula holds for a 100% hydration starter. The calculator uses a more generalized approach based on total flour and water.

   Let T = Total Levain Weight
   Let H = Hydration (decimal, e.g., 1.0 for 100%)
   Let SR = Starter Ratio (e.g., 1 for 1:1, 2 for 1:2)
   Let F_total = Total Flour in Levain
   Let W_total = Total Water in Levain
   Let S = Starter Weight

   We know:
   1. T = F_total + W_total
   2. W_total = F_total * H
   Substituting (2) into (1): T = F_total + (F_total * H) => T = F_total * (1 + H)
   Therefore, F_total = T / (1 + H)
   And W_total = F_total * H = (T / (1 + H)) * H

   Now, relate this to the starter ratio. The starter ratio (1:SR) refers to the ratio of *starter* to *added flour*.
   Let F_added = weight of added flour.
   Then S = SR * F_added. This is NOT standard. Standard is Starter:FLOUR ratio.
   Let’s use the common interpretation: Starter vs. Added Flour.
   If ratio is 1:SR, it means Starter Weight / Added Flour Weight = 1 / SR.
   So, Added Flour Weight (F_added) = SR * Starter Weight (S).
   Total Flour (F_total) = Flour in Starter (F_starter) + F_added.
   Assuming 100% hydration starter (50% flour), F_starter = S / 2.
   So, F_total = S/2 + SR * S = S * (1/2 + SR).
   We have F_total = T / (1 + H).
   Therefore, S * (1/2 + SR) = T / (1 + H).
   S = [T / (1 + H)] / (1/2 + SR)
   S = T / [(1 + H) * (0.5 + SR)]

   Let’s test with common values: T=100g, H=1.0 (100%), SR=1 (1:1 starter:added flour).
   F_total = 100 / (1 + 1.0) = 100 / 2 = 50g.
   W_total = 50 * 1.0 = 50g.
   Total = 50g Flour + 50g Water = 100g. This is correct for the total composition.
   Now find starter weight S:
   S = 100 / [(1 + 1.0) * (0.5 + 1)] = 100 / [2 * 1.5] = 100 / 3 = 33.33g.
   This means we use 33.33g starter.
   Flour in starter = 33.33 / 2 = 16.67g.
   Water in starter = 33.33 / 2 = 16.67g.
   Added Flour = SR * S = 1 * 33.33 = 33.33g.
   Added Water = H * F_added = 1.0 * 33.33 = 33.33g.
   Total Levain = Starter (33.33g) + Added Flour (33.33g) + Added Water (33.33g) = 99.99g (approx 100g).
   Total Flour = Flour in Starter (16.67g) + Added Flour (33.33g) = 50g. Correct.
   Total Water = Water in Starter (16.67g) + Added Water (33.33g) = 50g. Correct.

   The calculator uses a slightly different interpretation of SR (Starter:Flour as TOTAL Flour, not ADDED Flour).
   Let T = Total Levain Weight
   Let H = Hydration (decimal)
   Let SR_input = Starter Ratio Input Value (e.g., 1 for 1:1, 2 for 1:2)
   Assume the ratio is Starter Weight / (Total Flour Weight) = 1 / SR_input.
   So, Starter Weight (S) = Total Flour Weight (F_total) / SR_input.

   We know:
   F_total = T / (1 + H)
   W_total = F_total * H

   Now substitute F_total into the starter equation:
   S = [T / (1 + H)] / SR_input

   Let’s re-test with T=100g, H=1.0 (100%), SR_input=1 (1:1 Starter:TotalFlour).
   F_total = 100 / (1 + 1.0) = 50g.
   W_total = 50 * 1.0 = 50g.
   S = 50g / 1 = 50g.
   This means 50g Starter, 50g Flour, 50g Water. Total = 150g. This doesn’t match the Total Levain Weight.

   The most common interpretation for Sourdough Levain building:
   Total Levain Weight (T)
   Hydration (H) – Water as % of Flour
   Starter Ratio (SR) – Ratio of EXISTING Starter to NEW Flour (e.g., 1:2 means 1 part starter, 2 parts new flour)

   Let F_new = Weight of NEW Flour added
   Let W_new = Weight of NEW Water added
   Let S = Weight of EXISTING Starter used

   H = (Water in S + W_new) / (Flour in S + F_new)
   SR = S / F_new => F_new = S / SR

   Assuming starter is 100% hydration (50% flour, 50% water):
   Flour in S = S / 2
   Water in S = S / 2

   Substitute into Hydration formula:
   H = (S/2 + W_new) / (S/2 + F_new)
   H * (S/2 + F_new) = S/2 + W_new
   W_new = H * (S/2 + F_new) – S/2

   Total Levain Weight T = S + F_new + W_new
   T = S + (S/SR) + [H * (S/2 + S/SR) – S/2]
   T = S + S/SR + H*S/2 + H*S/SR – S/2
   T = S * [1 + 1/SR + H/2 + H/SR – 1/2]
   T = S * [1/2 + 1/SR + H/2 + H/SR]
   T = S * [ (SR + 1)/2SR + H(1+SR)/2SR ]
   T = S * [ (1+SR)(1+H) / 2SR ]
   S = (2 * SR * T) / ( (1+SR)(1+H) )

   Let’s test this formula: T=100g, H=1.0 (100%), SR=2 (1:2 starter:flour).
   S = (2 * 2 * 100) / ( (1+2)(1+1.0) )
   S = 400 / (3 * 2) = 400 / 6 = 66.67g (Starter)

   F_new = S / SR = 66.67g / 2 = 33.33g (New Flour)
   Water in S = S/2 = 66.67g / 2 = 33.33g
   W_new = H * (S/2 + F_new) – S/2
   = 1.0 * (33.33g + 33.33g) – 33.33g
   = 1.0 * 66.66g – 33.33g = 33.33g (New Water)

   Total Levain = S + F_new + W_new = 66.67g + 33.33g + 33.33g = 133.33g.
   This still doesn’t match T=100g.

   The calculator’s logic MUST match the input interpretation. Let’s assume the inputs mean:
   Total Levain Weight = T
   Levain Hydration = H (Water as % of Total Flour)
   Starter Ratio = S:F (Existing Starter : Added Flour)

   Let S = Starter weight
   Let F_added = Added Flour weight
   Let W_added = Added Water weight
   T = S + F_added + W_added

   Assume starter is 100% hydration (50% flour, 50% water).
   Flour in S = S/2
   Water in S = S/2

   From Starter Ratio (S:F_added), we have S / F_added = 1 / SR_value => F_added = S * SR_value
   From Levain Hydration (H), we have (Water in S + W_added) / (Flour in S + F_added) = H
   (S/2 + W_added) / (S/2 + S*SR_value) = H
   S/2 + W_added = H * (S/2 + S*SR_value)
   W_added = H * (S/2 + S*SR_value) – S/2

   Substitute F_added and W_added into Total Weight T:
   T = S + (S * SR_value) + [H * (S/2 + S*SR_value) – S/2]
   T = S + S*SR_value + H*S/2 + H*S*SR_value – S/2
   T = S * [1 + SR_value + H/2 + H*SR_value – 1/2]
   T = S * [1/2 + SR_value + H/2 + H*SR_value]
   T = S * [ (1 + H)/2 + SR_value(1 + H) ]
   T = S * [ (1 + H)/2 * (1 + 2*SR_value) ]
   S = T / [ (1 + H)/2 * (1 + 2*SR_value) ]
   S = 2 * T / [ (1 + H) * (1 + 2*SR_value) ]

   Let’s re-test: T=100g, H=1.0 (100%), SR_value=1 (1:1 starter:added flour).
   S = 2 * 100 / [ (1 + 1.0) * (1 + 2*1) ]
   S = 200 / [ 2 * 3 ] = 200 / 6 = 33.33g (Starter)

   F_added = S * SR_value = 33.33g * 1 = 33.33g (Added Flour)
   W_added = H * (S/2 + F_added) – S/2
   = 1.0 * (33.33g/2 + 33.33g) – 33.33g/2
   = 1.0 * (16.67g + 33.33g) – 16.67g
   = 1.0 * 50g – 16.67g = 33.33g (Added Water)

   Total Levain = S + F_added + W_added = 33.33g + 33.33g + 33.33g = 99.99g (approx 100g). This matches T.
   Total Flour = Flour in S (S/2) + F_added = 16.67g + 33.33g = 50g.
   Total Water = Water in S (S/2) + W_added = 16.67g + 33.33g = 50g.
   Hydration = Total Water / Total Flour = 50g / 50g = 1.0 = 100%. Matches H.
   Starter Ratio = S / F_added = 33.33g / 33.33g = 1. Matches SR_value.

   This is the logic implemented in the calculator.

   Total Flour (F_total) = Flour in S + F_added = S/2 + S*SR_value = S * (0.5 + SR_value)
   Total Water (W_total) = Water in S + W_added = S/2 + H*(S/2 + S*SR_value) – S/2 = H*(S/2 + S*SR_value) = H * F_total

   The calculator calculates T, H, SR_value.
   Then calculates S.
   Then calculates F_added = S * SR_value.
   Then calculates W_added = H * (S/2 + F_added) – S/2.
   Then calculates Total Flour = S/2 + F_added.
   Then calculates Total Water = S/2 + W_added.

Variable Explanations

Variable	Meaning	Unit	Typical Range
Total Levain Weight (T)	The desired final weight of the levain mixture for your bake.	grams (g)	50g – 500g (or more, depending on recipe)
Levain Hydration (H)	The ratio of water to total flour in the levain, expressed as a decimal.	Decimal (e.g., 1.0 for 100%)	0.5 (50%) – 1.5 (150%)
Starter Ratio (SR)	The ratio of the weight of existing mature starter to the weight of added flour.	Ratio (e.g., 1 for 1:1, 2 for 1:2)	1 – 10
Mature Starter (S)	The amount of active, mature sourdough starter to use.	grams (g)	Calculated
Added Flour (Fadded)	The amount of new flour to mix into the levain.	grams (g)	Calculated
Added Water (Wadded)	The amount of new water to mix into the levain.	grams (g)	Calculated
Total Flour (Ftotal)	The combined weight of flour from the starter and added flour.	grams (g)	Calculated
Total Water (Wtotal)	The combined weight of water from the starter and added water.	grams (g)	Calculated

Practical Examples (Real-World Use Cases)

Example 1: Standard Levain Build

A baker wants to build a 150g levain for a high-hydration country loaf. They typically use a 100% hydration starter (meaning equal parts flour and water by weight) and prefer a 1:3 starter-to-flour ratio for a moderately active levain. They aim for a final levain hydration of 100%.

• Total Levain Weight (T): 150g
• Levain Hydration (H): 1.0 (for 100%)
• Starter Ratio (SR): 3 (for 1:3 starter:added flour)

Using the calculator (or formulas):

• Starter (S) = 2 * 150g / [(1 + 1.0) * (1 + 2*3)] = 300g / [2.0 * 7] = 300g / 14 ≈ 21.4g
• Added Flour (F_added) = S * SR = 21.4g * 3 ≈ 64.3g
• Added Water (W_added) = H * (S/2 + F_added) – S/2 = 1.0 * (21.4g/2 + 64.3g) – 21.4g/2 = 1.0 * (10.7g + 64.3g) – 10.7g = 75.0g – 10.7g ≈ 64.3g
• Total Levain: 21.4g Starter + 64.3g Added Flour + 64.3g Added Water ≈ 150.0g
• Total Flour: 21.4g/2 (from starter) + 64.3g (added) ≈ 10.7g + 64.3g = 75.0g
• Total Water: 21.4g/2 (from starter) + 64.3g (added) ≈ 10.7g + 64.3g = 75.0g
• Resulting Hydration: 75.0g Water / 75.0g Flour = 100%

Interpretation: This build requires a relatively small amount of mature starter (21.4g) combined with a larger portion of flour (64.3g) and an equal amount of water (64.3g) to reach the target 150g levain at 100% hydration. This ratio is good for moderate fermentation speed.

Example 2: Stiff Levain Build

Another baker is preparing for a recipe that calls for a stiff levain, which ferments slower and contributes less initial liquid to the dough. They need 100g total levain, want a final hydration of 50%, and are using a 1:4 starter-to-flour ratio.

• Total Levain Weight (T): 100g
• Levain Hydration (H): 0.5 (for 50%)
• Starter Ratio (SR): 4 (for 1:4 starter:added flour)

Using the calculator (or formulas):

• Starter (S) = 2 * 100g / [(1 + 0.5) * (1 + 2*4)] = 200g / [1.5 * 9] = 200g / 13.5 ≈ 14.8g
• Added Flour (F_added) = S * SR = 14.8g * 4 ≈ 59.2g
• Added Water (W_added) = H * (S/2 + F_added) – S/2 = 0.5 * (14.8g/2 + 59.2g) – 14.8g/2 = 0.5 * (7.4g + 59.2g) – 7.4g = 0.5 * 66.6g – 7.4g = 33.3g – 7.4g ≈ 25.9g
• Total Levain: 14.8g Starter + 59.2g Added Flour + 25.9g Added Water ≈ 100.0g
• Total Flour: 14.8g/2 (from starter) + 59.2g (added) ≈ 7.4g + 59.2g = 66.6g
• Total Water: 14.8g/2 (from starter) + 25.9g (added) ≈ 7.4g + 25.9g = 33.3g
• Resulting Hydration: 33.3g Water / 66.6g Flour ≈ 49.9% (close to 50% due to rounding)

Interpretation: For this stiff levain, a larger proportion of the total weight is flour (66.6g) compared to water (33.3g). This results in a thicker, paste-like consistency that ferments more slowly. The amount of starter used (14.8g) is relatively high compared to the added flour (59.2g), indicating a faster feeding cycle for the starter component itself.

How to Use This Levain Calculator

Using the Levain Calculator is straightforward and designed to give you precise measurements for your sourdough baking needs. Follow these simple steps:

1. Step 1: Determine Your Target Levain Weight.
   Decide on the total amount of levain your recipe requires. This is usually specified in grams within the sourdough recipe. Enter this value into the “Total Levain Weight (g)” field. For example, if your recipe needs 100g of levain, enter ‘100’.
2. Step 2: Set Your Desired Levain Hydration.
   Hydration refers to the ratio of water to flour in your final levain mixture. Enter this as a percentage. Common hydration levels range from 50% (stiff levain) to 100% (equal parts water and flour) or even higher. For 100% hydration, enter ‘100’. For 50% hydration, enter ’50’.
3. Step 3: Choose Your Starter Ratio.
   This determines how much mature starter you’ll use relative to the amount of new flour you add. Select your preferred ratio from the dropdown menu (e.g., 1:1, 1:2, 1:3, 1:4, 1:5, 1:10). A lower number (like 1:1) means more starter relative to flour, leading to faster fermentation. A higher number (like 1:5) means less starter relative to flour, resulting in slower fermentation.
4. Step 4: Click “Calculate Levain”.
   Once all inputs are set, press the “Calculate Levain” button.

How to Read Results

The calculator will display:

• Primary Result: The total calculated weight of your levain, often highlighted. This should match your target weight.
• Intermediate Values:
  • Mature Starter (g): The exact weight of active starter you need to measure out.
  • Flour (g): The total weight of flour required for the levain (including flour from the starter and added flour).
  • Water (g): The total weight of water required for the levain (including water from the starter and added water).
• Levain Calculation Breakdown Table: This table provides a clear summary of the component weights (Starter, Flour, Water) that constitute your final levain.
• Levain Component Proportions Chart: A visual representation of the percentage breakdown of starter, flour, and water in your final levain.
• Formula Explanation: A brief description of how the calculations are performed.

Decision-Making Guidance

Use the results to guide your baking decisions:

• Fermentation Speed: A higher starter ratio (e.g., 1:1 or 1:2) with higher hydration will ferment faster. A lower starter ratio (e.g., 1:5 or 1:10) with lower hydration will ferment slower. Adjust these based on your schedule and desired proofing times.
• Dough Consistency: Stiffer levains (lower hydration) contribute less liquid to your main dough, which can be useful in recipes requiring precise dough hydration targets.
• Flavor Profile: While not directly controlled by these ratios, levain fermentation speed impacts flavor development. Faster fermentation tends towards milder flavors, while slower fermentation can enhance tanginess.
• Recipe Adherence: Always ensure the calculated total levain weight matches what your recipe calls for.

The “Reset” button will restore default values, and “Copy Results” allows you to easily paste the calculated breakdown elsewhere.

Key Factors That Affect Levain Results

Several factors influence how your levain behaves and the accuracy of your calculations. Understanding these helps in achieving consistent results and adapting to different conditions.

1. Starter Maturity and Activity: The “health” and activity level of your mature starter is paramount. A starter that hasn’t been fed recently or is sluggish will not perform as expected, potentially leading to under-leavening or off-flavors, regardless of correct calculation. Always use a starter that has been recently fed and is at its peak activity (bubbly and has risen significantly).
2. Ambient Temperature: Temperature significantly impacts fermentation speed. Warmer temperatures accelerate yeast and bacteria activity, causing the levain to rise and fall faster. Colder temperatures slow it down. Your calculated weights remain the same, but the *time* it takes for the levain to become active and peak will vary. The calculator provides weights, but you must observe your levain’s behavior in your specific environment.
3. Flour Type: The type of flour used in the levain build (and in your starter) affects its absorption and fermentation characteristics. Whole grain flours (like rye or whole wheat) contain more nutrients and microorganisms, leading to faster and more vigorous fermentation compared to white bread flour. They also absorb more water, which can slightly alter the final consistency. Ensure you use the specified flour type or understand how substitutions might affect performance.
4. Hydration Level: As defined, hydration directly impacts the levain’s consistency and fermentation rate. Higher hydration levains are runnier and ferment faster, while lower hydration (stiffer) levains are denser, ferment slower, and contribute less moisture to the final dough. This is a key variable you control directly.
5. Starter Ratio: The ratio of starter to added flour dictates the “charge” of yeast and bacteria you’re introducing relative to the food source (flour and water). A higher starter ratio (e.g., 1:1) means more microbial activity per gram of food, leading to quicker fermentation. A lower ratio (e.g., 1:5) means less initial activity relative to the food, promoting slower fermentation and often more complex flavor development.
6. Accurate Measurement: Precision in weighing ingredients is critical in baking, especially with sourdough. Even small inaccuracies in grams can compound, particularly in smaller batches or when dealing with precise hydration percentages. Using a digital scale is highly recommended for consistent levain builds. The calculator provides precise gram measurements assuming accurate weighing.
7. Water Quality: While less common in home baking, heavily chlorinated water can sometimes inhibit yeast activity. If you suspect this, letting tap water sit out for a few hours or using filtered water can be beneficial.

Frequently Asked Questions (FAQ)

What is the difference between a levain and a sourdough starter?

A sourdough starter is the established culture of wild yeast and bacteria that you maintain long-term. A levain is a specific portion of that mature starter that you build and use for a particular bake. Think of the starter as your “mother culture” and the levain as the “baby” you create from it for a specific job.

My levain didn’t rise. What went wrong?

Several factors could be at play: your starter might not have been active enough when you fed it, the ambient temperature might be too cold, or the feeding ratio might be too low for the conditions. Ensure your starter is bubbly and has recently peaked before using it to build the levain.

Can I use different types of flour in my levain?

Yes, you can! Using whole grain flours like rye or whole wheat in your levain can add complexity to the flavor and may speed up fermentation due to higher nutrient content. However, they absorb water differently, so you might need to adjust hydration slightly. It’s often best to start with the flour specified in your starter maintenance routine.

How long does it take for a levain to become active?

This varies greatly depending on the feeding ratio, hydration, flour type, and ambient temperature. A typical 1:2:2 (starter:flour:water) or 1:3:3 levain at 100% hydration in a warm environment (around 75-80°F / 24-27°C) might peak in 4-8 hours. Stiffer or less-fed levains will take longer.

What does “peak activity” mean for a levain?

Peak activity refers to the point when the levain has risen the most and is just beginning to fall or deflate. It’s typically characterized by a domed top, abundant bubbles, and a slightly sour, yeasty aroma. Using the levain at or just before its peak ensures optimal leavening power for your dough.

Can I adjust the total levain weight if my recipe’s amount is slightly different?

Yes, you can adjust the total levain weight. The calculator allows you to input any desired weight. However, remember that if you significantly deviate from the recipe’s specified levain amount, it might affect the final bread’s structure, rise, and flavor balance. You may also need to adjust the amount of other ingredients (like salt or main dough flour) proportionally.

What is the typical percentage of levain in a sourdough recipe?

Levain typically constitutes 10% to 30% of the total flour weight in a sourdough recipe. For example, if a recipe calls for 500g of flour in the main dough, the levain might range from 50g (10%) to 150g (30%). This percentage influences fermentation speed and flavor development.

Does the calculator account for the flour and water already in my starter?

Yes, the calculator is designed to account for the flour and water present in your mature starter, assuming a standard 100% hydration (50% flour, 50% water by weight) for the starter itself. It calculates the required starter weight and then determines the necessary amounts of additional flour and water to achieve your desired total levain weight and hydration.

// For this single-file output, we’ll add it directly.
var script = document.createElement(‘script’);
script.src = ‘https://cdn.jsdelivr.net/npm/chart.js’;
document.head.appendChild(script);