Paper Dice Net Generator

Drawing a d20 net by hand is an afternoon of compass work — twenty equilateral triangles that have to meet exactly, or the model will not close, and getting one edge a millimetre out only shows up on the last face. This builds the net from the geometry instead, at whatever edge length you ask for, with tabs to glue and whatever you want written on the faces.

Solid

Page size

Edge length in millimetres

Between 10 and 120, as far as the page allows.

Face labels

Optional. 20 of them, separated by commas. Numbers by default.

20 faces at 30mm an edge. The finished solid is about 57.06mm across. Print at 100%, cut the solid lines, fold the rest, and glue the dashed tabs underneath.

✓ The net has the right number of faces — 20 faces of 3 sides each
✓ Every edge is exactly the same length — 60 edges, all 30mm to within a hundredth of a millimetre
✓ The net cuts out in one piece — every face is joined to another along a fold
✓ The whole net fits on the page — inside 210 by 297mm
✓ There are glue tabs to fasten it with — 8 tabs on alternate outside edges, so no two tabs meet when it is folded

What this generator does

Places each face by reflecting a neighbour across the edge they share, so the shared edges are identical by construction, then adds glue tabs and fits the whole thing to the page.

How to use this tool

Choose the solid — four, six, eight, twelve or twenty faces.
Set the edge length in millimetres and the page to print on.
Type your own face labels if numbers are not what you want.
Download the SVG, print at 100%, cut the solid lines and fold the rest.

Understanding the controls

Solid: Which of the five regular solids: four triangles, six squares, eight triangles, twelve pentagons or twenty triangles. These are the shapes that make fair dice, because every face is identical.
Page size: A4, A3, A5, US Letter or US Legal. The drawing is measured in millimetres so it prints at true size.
Edge length in millimetres: How long one edge of the finished solid is. A larger edge makes a larger model, and the page will refuse a size that no longer fits rather than cropping it.
Face labels: What to print in the middle of each face, separated by commas. Numbers are used when you leave it empty, and anything longer than six characters is trimmed because it will not fit on a face.

Common use cases

Making a set of paper dice for a game when the real ones are lost
Custom dice with words, symbols or names on the faces
Teaching nets and solids with something children actually build
A prop or a decoration at a size no shop sells
Prototyping a dice design before having it made

How this generator works

Every face is positioned by reflecting an adjacent face across the edge they share, which makes shared edges identical rather than merely close — that is what decides whether the model closes at the last face. The drawing is then measured rather than trusted: every edge must be the length you asked for to within a hundredth of a millimetre, the face count and the number of sides on each must match the solid, the net must come out in one piece (two for the dodecahedron, which prints as two flowers), and nothing may fall off the page. Tabs go on alternate outer edges so no two tabs meet when it is folded.

Randomness and fairness

Nothing is random. The same solid at the same size always gives the same net.

For how randomness is produced across the whole site, see how Generate Random works.

Limitations and good to know

A dodecahedron prints as two flowers of six faces, which are glued to one another — that is how these templates are normally made.
Printing scaled to fit changes the edge length, so print at 100%.
The tabs are placed on alternate outer edges, which is enough to assemble the model but is not a full tab-per-seam layout.
The output is an SVG rather than a PDF, which any browser will print.
A paper solid is only as fair a die as your folding is accurate.

Privacy and your data

The net is drawn in your browser from the numbers you set. Face labels stay on the device and are never uploaded.