Croissant Butter Calculator
Calculate détrempe and butter block weights for laminated dough. Determine butter block dimensions, layer count from folds, and dough per piece.
About this calculator
Laminated dough is built from two separate masses that get folded together — the détrempe (the flour-based base dough) and the butter block that gets encased inside it — and this calculator splits your Total Dough Weight into those two pieces based on the Butter Percentage you choose (25–30% is the classic croissant range). It then sizes the butter block itself: assuming a standard butter density of about 0.911 g/cm³ and a practical lamination thickness of 1 cm, it back-calculates the block's volume from its weight and reports the side length of a square block at that thickness — the shape most bakers actually roll out before encasing it in the détrempe. Layer Count comes from the folding math for single (also called "letter") folds, where each fold triples the existing layers, so the total is simply 3 raised to the power of your fold count — 3 folds gives 27 layers, 4 gives 81.
This is specifically the single-fold formula; if you're using book folds (which quadruple layers) instead, the layer count here will not match your actual result. Finally, Dough per Piece just divides the total dough weight by how many croissants or pastries you plan to cut, useful for portioning before final shaping. This model assumes zero dough or butter is lost to trimming, so scale your total dough weight up slightly to compensate for real-world waste.
Inputs
Results
Détrempe weight
1,095 g
≈ 10 sticks of butter
Butter block weight
405 g
≈ 4 sticks of butter
How to Use This Calculator
- Enter the total target weight of finished laminated dough in grams.
- Set the butter percentage (classic croissant: 25–30% of dough weight).
- Enter the number of single folds and how many pieces to cut.
- The calculator shows détrempe weight, butter block weight, recommended block dimensions, layer count, and dough weight per piece.
- Shape the butter block to the indicated square size and chill before laminating to ensure even layers.
How the result changes with Total dough weight
| Total dough weight | Détrempe weight | Butter block weight |
|---|---|---|
| 750 | 547 g | 203 g |
| 1,125 | 821 g | 304 g |
| 2,250 | 1,642 g | 608 g |
| 3,750 | 2,737 g | 1,013 g |
What each input means
- Total dough weight
- Target total weight of finished laminated dough.
- Butter percentage
- Butter as percentage of total dough weight (classic croissant: 25–30%).
- Number of single folds
- Number of single (letter) folds. 3 folds = 27 layers, 4 = 81.
- Number of pieces
- How many croissants or pastries to cut.
What each result means
- Détrempe weight
- Weight of the base dough (flour, water, yeast, etc.).
- Butter block weight
- Weight of the butter block for lamination.
- Butter block size
- Square butter block dimensions at ~1 cm thickness.
- Layer count
- Total dough layers after folding (3^folds for single folds).
- Dough per piece
- Weight of dough per individual pastry.
How this is calculated
Worked example, using the default values
- Identify Input Parameters4 parametersTotal dough weight = 1500, Butter percentage = 27, Number of single folds = 3, Number of pieces = 12 = 4 input(s) provided
- Calculate Détrempe weightDétrempe weight1095 = 1095
- Calculate Butter block weightButter block weight405 = 405
- Calculate Butter block sizeButter block size = round(sqrt(blockArea) * 10) / 1021.1 = 21.1
- Calculate Layer countLayer count27 = 27
Engine last updated . Checked against 2 independently-derived tests — how we verify calculators. Built by Paul Gunder, a software engineer, not a licensed financial, medical, or legal professional.
Frequently Asked Questions
How does the calculator turn Butter Percentage into the détrempe and butter block weights?
Butter Block Weight is simply your Total Dough Weight multiplied by the Butter Percentage you enter, and Détrempe Weight is whatever's left after subtracting that from the total. So at the classic 27% default on 1500 g of dough, the butter block comes out to 405 g and the détrempe to 1095 g — raising the percentage shifts weight from one to the other without changing the total.
Why does the calculator assume the butter block is square and 1 cm thick?
It back-calculates the block's dimensions from its weight using butter's density of about 0.911 g/cm³ to get volume, then divides by a fixed 1 cm thickness — a practical, commonly used lamination thickness — to get the block's area, and finally takes the square root of that area to report a single side length. It's a simplification: real butter blocks are sometimes rolled to a rectangle instead of a square, in which case you'd want to adjust the length and width to preserve the same area.
Why does Layer Count use 3 raised to the power of my fold count?
Each single (letter) fold takes the dough-and-butter stack and folds it into thirds, tripling the number of layers that existed before that fold. Starting from 1 layer, that means 3 folds gives 3³ = 27 layers and 4 folds gives 3⁴ = 81. This formula is specific to single folds — a book fold quadruples layers per fold instead, so the layer count shown here won't match a book-fold lamination schedule.
Does Dough per Piece account for butter or dough lost during shaping?
No — it's just your Total Dough Weight divided evenly by the Number of Pieces you specify, assuming every gram of dough makes it into a finished piece. Real lamination and shaping always trims some dough and butter at the edges, so treat this figure as a starting portion size and expect your actual finished pieces to run slightly lighter unless you scale up the total dough weight to compensate.
Related Calculators
The questions that sit next to this one — chosen by subject, including calculators filed under a different category.
Dough Hydration Calculator
Calculate how much additional water to add when your recipe includes eggs, milk, or other liquids. Accounts for the water content already present in each ingredient.
BakeryBaker's Percentage Calculator
Calculate baker's percentages for any bread or pastry recipe. Express every ingredient as a percentage of total flour weight — the universal language of professional baking.
BakeryProofing Time Calculator
Estimate bulk fermentation and final proof times based on dough temperature, yeast percentage, sugar, salt, and ambient conditions.
More in Cooking, Food & Beverage.