Triangular Grid Paper

Printable Triangular Grid Paper — a Full Equilateral-Triangle Mesh

Triangular grid paper is a sheet tiled edge-to-edge with equilateral triangles. Three families of parallel lines — horizontal, 60°, and 120° from horizontal — cross at every vertex, so the whole page fills with small upward- and downward-pointing triangles. Because every edge is printed (not just the vertices), you can trace shapes, colour individual triangles, and build repeating patterns straight off the grid. Download a crisp vector PDF in A4 or US Letter.

This is the line-drawn cousin of isometric dot paper, which prints only the vertices. If you want a clean field of dots for 3D sketching, use that tool; if you want the full triangle mesh to colour and trace, this is the sheet you want.

Triangular grid vs. isometric grid — what's the difference?

The two grids share the same lattice of points, but they serve different jobs. Isometric grid paper is tuned for drawing 3D solids: you walk along the three axes to project cubes and prisms without a protractor. Triangular grid paper foregrounds the triangles themselves — the individual faces become the unit you work in. That makes it the better choice when the shape of each triangle matters: tessellation art, quilt piecing, beadwork charts, and geometry lessons about symmetry and area.

• Triangular grid — colour, cut, and trace complete triangles; pattern and tessellation work.
• Isometric grid — sketch 3D objects along three axes at 120°.
• Isometric dots — the same lattice as dots only, for the cleanest 3D drawings.

What you can customise

• Triangle size: any side length from 5 mm to 20 mm. Small triangles pack fine detail onto the page; large triangles give roomy cells for young learners and bold pattern work.
• Line weight: Light for a quiet grid that sits behind your own marks, or Medium when you want the mesh itself to read clearly.
• Paper size: A4, US Letter, or US Legal — the triangle side stays exact across all three.

Who triangular grid paper is for

Quilters and crafters

Plan half-square and equilateral-triangle blocks, chart English paper piecing, and lay out beadwork or cross-stitch motifs where the triangle is the natural unit.

Artists and designers

Build tessellations, Islamic-style geometric patterns, low-poly illustrations, and repeating surface designs by colouring triangles directly on the grid.

Maths teachers and students

Explore symmetry, rotational order, area by counting triangles, and the geometry of equilateral and 30-60-90 triangles with a ready-made mesh.

Game designers

Sketch triangular-tile boards, hex-adjacent maps, and strategy layouts where movement follows triangle edges.

Choosing a triangle size

5–7 mm — fine

Dense mesh for intricate tessellations, beadwork charts, and detailed pattern repeats.

10 mm — everyday default

Balanced spacing that suits most pattern work and classroom tasks without crowding the page.

15–20 mm — large

Roomy triangles for young learners, bold colouring, quilt-block planning, and drawings you intend to photocopy.

How to use the tool

1. Set the triangle side length between 5 mm and 20 mm.
2. Pick a light or medium line weight.
3. Choose A4, US Letter, or US Legal.
4. Watch the live preview update, then click Download.
5. Print at 100% scale — turn off "fit to page" so the triangles stay a true, measurable size.

Worked example: a simple tessellation

Suppose you want a repeating three-colour tessellation on 10 mm triangular grid paper. Notice that six triangles meet at every vertex, alternating point-up and point-down. Colour one point-up triangle red, its point-down neighbour blue, and the next point-up triangle yellow, then repeat that A-B-C rhythm across each row, shifting the start colour by one each new row. Because the grid is exact, the pattern locks together perfectly and tiles the whole page. Cut along the printed edges and you have a set of identical equilateral triangles for a physical mosaic.

Methodology

The sheet is drawn as vector PDF from three straight-line families. One family is horizontal; the other two run at 60° and 120°. The vertical spacing between horizontal lines is set to the triangle side × √3/2, which is exactly the height of an equilateral triangle, so every cell is a true equilateral triangle rather than a stretched one. All lines are clipped to the printable body, and each line family is capped so the generator always finishes quickly even at the smallest 5 mm setting.

Every printable-paper template on the site runs through one shared branded PDF pipeline, so the header, footer, watermark, and QR code stay consistent no matter which sheet you generate.

Designed for A4 and US Letter printing

The triangle side length is held exact across paper sizes; only the number of triangles per row and column changes between A4, US Letter, and US Legal. Print at 100% scale so a triangle measured on paper matches the millimetre value you chose in the tool — important if you are cutting pieces for a quilt or a physical mosaic.

Tips for working on a triangular grid

• Use the Light line weight when you plan to colour cells, so the ink doesn't fight the grid.
• Switch to Medium when you're tracing or cutting along the printed edges.
• Remember six triangles surround every vertex — a handy check when a pattern looks off.
• For symmetry work, mark a central vertex and rotate your motif in 60° steps around it.
• Pair a larger triangle size with young learners; the bigger cells are easier to colour inside the lines.

Related printable paper tools

• Isometric Grid Paper — the same lattice tuned for 3D drawing
• Isometric Dot Paper — dot-only version of the lattice
• Graph Paper Generator — flexible square grid
• Hex Grid Paper — hexagon grid for games and maps