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Hex paper tiles the page with a lattice of hexagons instead of squares or triangles. Because every hexagon has six equal neighbors at consistent distances (unlike a square grid, where diagonal neighbors are farther away than adjacent ones), it's the standard choice anywhere movement or distance across a grid needs to feel uniform in every direction. Sheetful builds the lattice from the hexagon's edge length, in real millimeters, so it prints at true scale.
The most common use is tabletop RPG and wargame maps, where hex grids handle movement and range more fairly than a square grid. It also shows up in organic chemistry (hexagonal ring structures), quilting and patchwork templates, and beadwork charting. Set the hex edge length, choose US Letter or A4, and adjust line weight and color — a finer, lighter grid works well as a drafting underlay, while a bolder one reads clearly as a finished map grid.
It's the edge length of each hexagon, in millimeters. The overall width of a hexagon (flat side to flat side) works out to roughly 1.7× the edge length for the pointy-top orientation this tool generates.
15–25mm is typical for a map you'll draw miniatures or tokens onto; smaller (8–12mm) works well for large-scale overview maps covering more terrain per page.
Pointy-top — each hexagon has a vertex pointing up and down, with flat sides left and right. This is the more common orientation for RPG hex maps.
Yes — a smaller hex size with fine, light-colored lines works well as an underlay for sketching ring structures and organic chemistry diagrams.