Short answer: decorated cookie dough is rolled to 6 mm, pieces under 5 cm go to 3 mm and gingerbread goes to 8 or 10 mm. Even thickness matters more than the exact number: dough at 4 mm on one edge and 8 mm on the other browns unevenly and the cutter sinks deeper on one side.
How thick should cookie dough be?
Decorated cookie dough is rolled to 6 mm, which is the 1/4 inch disc of a graduated rolling pin. Baking discs come in 1/16, 1/6, 1/4 and 3/8 inch, and the 1/4 inch disc is the one used for medium cookies, according to The Kitchen Chair. The table below converts those measurements to millimetres and to the piece each one fits.
| Thickness | Reference | Best for | What happens when it is thin |
|---|---|---|---|
| 3 mm | 3 mm strip | 3 to 5 cm pieces, letters, toppers | the edge breaks when unmoulding |
| 4.2 mm | 1/6 inch disc | medallions and 6 cm cookies | the centre browns before the edge |
| 6.35 mm | 1/4 inch disc, the standard | decorated cookies from 8 to 10 cm | the piece loses height and warps in the oven |
| 9.5 mm | 3/8 inch disc | gingerbread, cookies that stand on their own | it will not hold on the tree or the tray |
How to pick the thickness for a new piece
The shape decides. If the design has details under 3 mm wide, the dough goes to 6 mm so the detail survives unmoulding. If the shape is solid and large, 4 mm is enough and the cookie bakes faster. In our workshop we check the cutter edge before recommending a thickness. The standard kingscutter.com cutter is generated with a 12.5 mm blade and a 0.8 mm wall. With that edge it cuts any dough in the table without falling short.
How do you roll dough to an even thickness?
A levelling strip is a flat ruler placed on the table on each side of the dough; the rolling pin rolls across the 2 strips and the dough keeps the exact height of the strip. The levelling strip solves the problem at the root, because thickness stops depending on your hand and starts depending on a printed part that always measures the same.
- Flour the table lightly: one spoonful scattered and shaken off covers the whole batch.
- Place one strip on each side of the dough, spaced by the width you want to roll.
- Rest the rolling pin on the 2 strips and roll: the pin never touches the dough.
- Remove the strips and cut the shapes with the cutter, re-rolling the scraps no more than 2 times.
The result is a sheet of constant thickness across the whole surface, which is the condition for the cutter to go in straight and for every piece to bake in the same time. When the dough ends up uneven, the symptom shows up while cutting: the cutter sticks in the thick area, as explained in dough sticking to the cutter.
How are the strips generated on kingscutter.com?
Levelling strips are generated in the kingscutter.com designer without uploading any image: the product is parametric and every measurement is set in the panel. The file downloads as an STL and prints flat, with the engraved face up.
What you set in the panel
- Thickness: from 1 to 10 mm, which is the final thickness of the dough. The number is engraved on one end of the strip.
- Count: from 1 to 6 strips. They are used in pairs, one on each side of the dough.
- Length: from 60 to 220 mm. Default 180 mm, the length of the acrylic strips in our workshop.
- Width: from 10 to 40 mm. Default 22 mm, enough for the pin to rest without slipping.
- Corners: from 0 to 8 mm of rounding, so the strip leaves no marks on the table.
- Marker: a circle, triangle, square or heart cut out at the other end, to recognise the set from afar.
Levelling strip data and measurements
These are the measurements the kingscutter.com generator delivers, with the minimum, the maximum and the factory value of each parameter. The values come from the product code, not from an estimate.
| Parameter | Minimum | Maximum | Factory |
|---|---|---|---|
| Thickness | 1 mm | 10 mm | 3 mm |
| Strip count | 1 | 6 | 2 |
| Length | 60 mm | 220 mm | 180 mm |
| Width | 10 mm | 40 mm | 22 mm |
| Corner rounding | 0 mm | 8 mm | 2 mm |
The thickness number is recessed between 0.2 and 0.6 mm, which is 40 % of the strip thickness with a cap at each end: it reads clearly and never cuts through the part. On the print bed the strips sit 6 mm apart, so a set of 2 strips at 180 mm fits any 220 x 220 mm printer.
Why does even thickness change the result in a business?
Because even thickness is what makes 40 cookies bake the same and stack in a box without breaking. 37 % of home bakers who sell name cookies, brownies and bars as their best-selling item, according to the Better Baker Club survey (2022). A batch with 2 different thicknesses delivers 2 different products at the same price.
The levelling strip also saves material: leftover dough is always re-rolled to the same thickness, without adding extra flour, and the cutter works on a flat surface that does not move. To choose the size of the piece that goes with each thickness, use the guide on how to choose set sizes.
Which doughs work with the strips?
The strips work with any dough you roll with a pin: cookie dough, gingerbread, salt dough, polymer clay and firm fondant. The strip prints in PETG, a plastic suitable for food contact under title 21 of the eCFR, section 177.1315, and it is washed by hand with warm water and mild soap.
- Cookie dough: 6 mm for royal icing decoration, 4 mm for small pieces.
- Gingerbread: 8 or 10 mm, because the piece has to stand on its own.
- Polymer clay and salt dough: the same thickness as cookie dough, with the strip cleaned between materials.
- Firm fondant: 3 mm, with the dough cold and the table barely greased.
Common mistakes with levelling strips
- A pin shorter than the gap between strips. The pin must be longer than the spacing, or it does not rest on both and the dough comes out wedge shaped.
- Strips on a floured table. Loose flour makes the strip slide; rest it on a clean table and flour only the dough.
- 1 mm thickness. The panel allows 1 mm, but the part ends up very thin and bends under the pin. For delicate doughs use 2 mm.
- Washing them in the dishwasher. PETG withstands around 80 °C and the dishwasher drying cycle combines heat with alkaline detergent: the part warps and loses the engraved thickness.
The kingscutter.com library holds hundreds of designs to cut the dough once it is levelled, and the first download is free. The Christmas designs cut most often at 6 mm are the gingerbread man, the Christmas tree and the snowflake.
Sources and standards
The technical data in this guide rests on verifiable sources:
- eCFR, title 21, section 177.1315 â polymers suitable for food contact.
- The Kitchen Chair â reference thicknesses of rolling pin discs.
- Better Baker Club â survey of home bakers who sell (2022).
- Wikipedia: Cookie cutter â definition and types of cutter.
