Isometric graph paper, ¼ inch

Isometric paper is what cubes, nets and three-dimensional shapes are drawn on. The grid does the perspective, so a child can draw a solid that looks right without being taught to draw.

The rows are spaced by the height of the triangle rather than by its side, which is what makes the grid genuinely thirty degrees instead of a squashed approximation of it.

The rules are drawn as real strokes at real sizes — not a picture of lines, and not a background tint. That matters more than it sounds: browsers drop background graphics when printing unless the reader has gone looking for the setting, so ruled paper made the obvious way looks perfect on screen and comes out of the printer blank. Put a ruler on this one. It is the size it says it is.

This sheet is set for US Letter — 8.5 × 11 inches. Paper size is not a preference here: sent to a printer loaded with something else, the browser shrinks the page to fit, and a ruling that has been shrunk is no longer the size it was chosen for. So there is a second copy of this sheet, ruled identically and measured for A4.