PrintableRuler.online30cm Ruler — PDF Download
A full 30cm ruler, built at exact physical scale in the PDF itself. Since 30cm is longer than a US Letter sheet, it's tiled across 2 pages with alignment marks — trim and tape them together.
Paper: US Letter · 2 sheets, tape together · alignment marks included
Before printing: open the PDF's print dialog and set Scale to 100% / "Actual size" — never "Fit to page" — or the ruler will print undersized. After printing, cut along the dashed line on sheet 1 and align it with the continuation on sheet 2 before taping.
Why 2 sheets?
US Letter paper's usable print width is under 30cm once margins are accounted for, so a true 30cm ruler doesn't fit on one sheet without shrinking it — which would make it inaccurate. Tiling across 2 sheets with matching alignment marks keeps the full 30.0cm length exact once taped together.
Need a different length or unit? Use the custom ruler builder, which handles tiling automatically for any length, or browse the other ready-made PDF rulers.