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From fermentation timing to lamination layers — every formula is grounded in real baking science.
Quick answer
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Live Ferment Timer
Dough temp — how warm your mixed dough feels (use a probe thermometer for accuracy). Inoculation — starter weight divided by flour weight × 100 (e.g. 100g starter in 500g flour = 20%). The timer updates as you type and shows a ±25% window because every kitchen is different. Open Start time, starter, cold retard to: set when you begin bulk fermentation and get a "ready at" clock; adjust for whether your starter is freshly fed, at peak, or hungry; or model a cold retard in the fridge. DoughRise Coach subscribers can record actual bulk times — after 3 bakes the predictions are calibrated to your kitchen, starter, and flour.
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Start time, starter, cold retard
Start time
Hours since fed
After (h)
Retard temp (°C)
Duration (h)
h
Saves to your history · calibrates after 3 bakes
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The lamination and fold planner
for sourdough and croissant layers
Quick answer
Layer count = fold multiplier raised to the power of the number of folds (a letter fold multiplies by 3 each time). Example: 3 letter folds = 3³ = 27 layers of butter and dough.
The lamination and fold calculator above helps you plan your bulk fermentation fold schedule. Select your fold type, enter the number of sets, and the calculator shows you how many layers you have created and suggests a timing schedule spaced through your bulk ferment.
Folding during bulk fermentation does two things: it builds gluten structure and redistributes fermentation gases through the dough. Early in the bulk, folds help the dough develop strength. Later, they encourage an even open crumb by ensuring no part of the dough sits without gas redistribution for too long.
A letter fold, where the dough is stretched into a rectangle and folded into thirds, creates 3 layers per set. Three letter folds give you 27 layers. Coil folds and stretch-and-folds are gentler and add less structural complexity per set, but they work well in high hydration doughs where lamination would be difficult to execute cleanly.
The same tool doubles as a croissant layer calculator. Viennoiserie lamination builds layers the same way: choose your fold type and how many turns you make, and the count multiplies each turn. A letter fold triples the layers, so three letter folds give the classic 27, while a book fold quadruples them. Set your fold type and number of turns and it returns the finished layer count.
Book and single folds multiply layers by 4 times and 2 times per fold instead of 3 times.
27
Layers from 3 letter folds
4
Fold types supported
30m
Typical interval between sets
How It Works
What’s actually happening when you laminate dough
Lamination works because butter and dough don’t merge under cold conditions. Each fold traps a fresh layer of solid fat between two layers of dough, and folding again multiplies that count rather than adding to it, which is why growth is exponential, not linear. A letter fold (into thirds) triples the layer count each turn, since it creates two new fold lines from one sheet. A book fold (both edges to the middle, then in half) quadruples it, since it doubles the sheet twice in one action. Three letter folds gets you the classic 27 layers most croissant recipes are built around; the same three turns as book folds gives 64, usually too many for a delicate viennoiserie crumb and closer to puff pastry territory.
What actually gives lamination its rise isn’t the yeast, it’s steam. During baking, moisture trapped between the paper-thin layers turns to steam and forces them apart, which is why keeping distinct, unbroken sheets of butter matters more than chasing a bigger layer count. Fold too many times and the layers thin until the butter blends into the dough during rolling, losing the separation the steam needs. That’s the real ceiling on lamination: past 5 or 6 letter folds (243 layers and up), the butter sheets rarely survive rolling intact, and the pastry bakes closer to a dense enriched bread than a flaky one.
Worked example: layering a danish batch
Say you’re making a batch of danish pastries and want at least 80 distinct layers for a properly structured, flaky crumb, a bit more than a basic croissant needs.
- Letter fold, 4 turns: 3 × 3 × 3 × 3 = 81 layers, comfortably past the 80-layer target
- Book fold, 3 turns undershoots at 4³ = 64 layers, and a 4th book fold overshoots to 4⁴ = 256, too thin for danish dough, so letter folds are the better fit here
- Starting lamination at 9:00am, with a 30-minute fridge rest after each fold, the 4th and final fold is done by around 11:25am
- That final fold goes straight into an overnight rest (8 to 12 hours at 4°C) rather than another 30-minute chill, ready to shape and proof the next morning
Four letter folds lands you just past 80 layers without over-thinning the butter, the balance danish dough needs. If you bake laminated dough often enough to want the schedule saved rather than re-typed each time, that’s one of the things DoughRise Pro handles for you.
Common lamination mistakes
Letting the butter get too warm (or too cold)
Butter should sit around 15 to 18°C: pliable enough to bend without cracking, but firm enough to stay in a distinct slab rather than smearing into the dough. Below about 13°C it shatters into shards and punctures the layers. Above 20°C it starts absorbing into the dough, the single most common reason home lamination goes wrong. If your kitchen runs warm, work in shorter bursts and chill more often.
Skipping the chill between folds
Rolling straight from one fold into the next, without the fridge rest, warms the butter and overworks the gluten at once. It partially merges with the dough instead of staying as a distinct sheet, and the layers fuse together in the oven instead of separating out. Give the dough its full 30 minutes in the fridge after every fold, no shortcuts.
Over-laminating past the point of no return
More folds sounds like more flake, but past 5 or 6 letter folds the butter sheets are so thin they tear or blend into the dough during rolling. Once that separation is gone, the steam has nothing to push against and the bake turns dense instead of layered. Work out your target layer count with the calculator first, rather than adding folds by feel.
Frequently Asked
Questions about
bread lamination and folding
What is the difference between lamination and stretch and fold?
Lamination in bread baking means stretching the dough into a thin sheet before folding it into distinct layers, similar in principle to croissant dough but applied to sourdough. A lamination fold involves fully sheeting the dough before folding it into thirds or quarters. Stretch and fold is gentler, pulling one section of dough up and over the mass without fully sheeting it. Both build gluten structure, but lamination creates a more pronounced layered internal structure in the finished loaf.
How many folds does sourdough need during bulk fermentation?
Most sourdough recipes call for 3 to 6 sets of folds during bulk fermentation, spaced 30 to 45 minutes apart. The number depends on your flour's protein content, dough hydration, and the structure you want in the final loaf. Higher hydration doughs generally benefit from more fold sets to develop sufficient strength. Stop folding when the dough feels taut, holds its shape between sessions, and has visibly increased in volume and lightened in texture.
How do I know when to stop folding sourdough?
The dough tells you. Early in bulk fermentation, a high hydration dough will spread easily and struggle to hold tension. After two or three sets of folds, you should notice it becoming increasingly smooth and elastic. By the final set, it should hold its shape, feel noticeably lighter as fermentation progresses, and pass the windowpane test: stretch a small piece thin enough to see light through without it tearing. At that point, the gluten is well developed and further folding is unnecessary.
Can I use this as a croissant layer calculator?
Yes. The same fold maths powers croissant lamination. Choose your fold type and how many turns you make: a letter fold multiplies the layer count by three each turn and a book fold by four. Three letter folds give the classic 27 layers that many croissants aim for. The calculator returns the finished layer count and a rest schedule that keeps the butter from breaking through between turns.
What temperature should butter be for laminating dough?
Around 15 to 18°C, pliable enough to bend without cracking but firm enough to stay in a distinct slab rather than smearing into the dough. Below about 13°C it shatters into shards during rolling and punctures the layers. Above 20°C it starts absorbing into the surrounding dough, which is the single most common reason home lamination goes wrong. If your kitchen runs warm, work in shorter bursts and return the dough to the fridge more often between folds.
Why did my croissant layers merge together instead of staying separate?
This almost always comes down to butter temperature or an insufficient chill between folds. If the butter got too warm during rolling, it partially merges with the dough instead of staying as a distinct sheet, so the layers fuse together in the oven instead of separating out. Give the dough its full 30 minutes in the fridge after every fold, and roll quickly and firmly rather than slowly, which builds up heat from your hands.
Is puff pastry lamination different from croissant lamination?
The mechanics are the same, folding a butter block into dough to build alternating layers, but the dough itself differs. Croissant dough is enriched with milk, sugar and a touch of yeast for a soft, slightly sweet crumb between the layers. Classic puff pastry uses no yeast and relies purely on steam from the butter for lift, so it puffs dramatically with no soft interior crumb. Danish sits between the two: enriched and yeasted like croissant, but usually with egg as well. The lamination fold calculator works for all three, since the layer maths (3 per letter fold, 4 per book fold) doesn’t change with the recipe.
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