Make printable isometric graph paper with a true 30° triangle grid, or switch to isometric dot paper. Set the triangle size in millimetres or inches, the line color and weight, Letter or A4, portrait or landscape, and download a vector PDF.
Last updated:
Grid style
Line color
Print at 100% / "Actual size" so the triangles keep their exact size.
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How to use the Isometric Graph Paper
Pick a style: Lines for a classic triangle grid, Dots for isometric dot paper, or Lines + dots.
Set the triangle size in mm or inches, or click a preset such as 5 mm or ¼ in.
Choose the look: line color, weight, grid direction and whether every 5th or 10th line is darker.
Choose the page: Letter, A4 or another size, orientation, margins, a header and the number of pages.
Download the PDF (or PNG) and print at 100% / Actual size.
Isometric grid geometry
Every isometric grid is built from equilateral triangles with side s. Two families of lines rise and fall at 30° to the horizontal, and a third family is vertical. From that one number the rest of the grid follows:
Measurement
Formula
5 mm grid
1 cm grid
¼ in grid
Triangle side / dot spacing along a line
s
5 mm
10 mm
6.35 mm
Distance between vertical lines (triangle height)
s × √3 ÷ 2 ≈ 0.866 s
4.33 mm
8.66 mm
5.50 mm
Perpendicular gap between parallel diagonals
s × √3 ÷ 2
4.33 mm
8.66 mm
5.50 mm
Area of one triangle
√3 ÷ 4 × s²
10.8 mm²
43.3 mm²
17.5 mm²
Width of a hexagon made of 6 triangles
2 s (point to point)
10 mm
20 mm
12.7 mm
Because all three directions are equally spaced, a unit cube drawn on the grid has every visible edge exactly one triangle side long.
How to draw a cube on isometric paper
Start at a dot and draw one vertical edge, one triangle side long.
From the top of that edge, follow the two 30° diagonals one step up-left and one step up-right.
Close the top face by drawing the two remaining diagonals so they meet in a diamond.
Drop the two outer verticals and join them to the bottom of the first edge with diagonals. Shade the left, right and top faces in three tones to make the cube look solid.
Stacking blocks: build larger shapes cube by cube, always drawing the front-most cubes first and erasing hidden lines.
Circles become ellipses: a circle on any face of an isometric cube appears as an ellipse whose long axis is perpendicular to that face's missing axis.
Use light lines for planning: a light blue or gray grid with hairline or fine weight disappears in photocopies and scans, leaving only your ink.
Popular uses
Use
Suggested settings
Math class: volume and nets of 3D shapes
1 cm lines or dots, Regular weight, Name + date header
Technical sketches and product ideas
5 mm lines, Hairline, light gray, major lines every 10th
Game maps, pixel art and voxel designs
¼ in dots or lines + dots, landscape
Quilt and tiling patterns
1 in lines, Bold, all three directions or the diamond grid
Hand-lettering in 3D block letters
5 mm dots, landscape, no header
Frequently asked questions
What is isometric graph paper?
Isometric graph paper is a grid of equilateral triangles made by three sets of parallel lines: one vertical and two at 30° above the horizontal (60° apart from each other). The three directions match the three axes of an isometric projection, so you can draw cubes, buildings and objects in 3D without measuring angles.
How is the spacing measured?
The spacing is the side length of one triangle, which is also the distance between neighbouring dots along any grid line. The vertical lines are then spaced side × √3 ÷ 2 apart (about 0.866 × the side), so 5 mm triangles have vertical lines 4.33 mm apart.
What is the difference between isometric lines and isometric dots?
Line paper shows every triangle, which is easiest for beginners. Isometric dot paper prints only the corners of the triangles, so your finished drawing is not crowded by grid lines; it is popular for sketching, game maps and math lessons on 3D shapes.
Which spacing should I choose?
5 mm or ¼ in triangles suit detailed technical sketches and pixel-style art. 1 cm or ½ in triangles are good for school geometry, building cubes and tracing 3D shapes. 1 in triangles work for young children or large wall diagrams.
Can I rotate the grid so the lines run horizontally?
Yes. Choose the “Horizontal (rotated)” grid direction to turn the grid 90°, giving horizontal lines with diagonals at 60°. This is useful for hexagon layouts and for landscape drawings where you want rows to read across the page.
Why are the triangles a little off when I print?
The PDF is drawn at exact physical size. If triangles come out smaller, the printer is scaling the page: choose “Actual size” or 100% instead of “Fit to page”. Most printers also cannot print to the very edge, which is why the default margin is 10 mm.
Is isometric drawing the same as perspective drawing?
No. In isometric drawing parallel edges stay parallel and all three axes are scaled equally, so measurements along the axes are true to scale. In perspective drawing parallel lines converge toward vanishing points, which looks more realistic but makes measuring harder.
Are all the tools on FreeToolCabin tested for quality and accuracy?
Yes! Every tool on our site undergoes automated Q/A testing in real browser environments to ensure high precision, correct output, and zero errors. If you happen to spot a bug or have a suggestion, please contact us at [email protected] and our team will review it right away.