PrintableRuler.onlineFull-Page A4 Ruler — PDF Download
A cm/mm ruler that runs edge-to-edge across a single landscape A4 sheet (about 27.7cm of usable length), built at exact physical scale in the PDF itself.
Paper: A4, landscape · 1 sheet · cm/mm scale
Before printing: open the PDF's print dialog, select A4 paper and landscape orientation, and set Scale to 100% / "Actual size" — never "Fit to page" — or the ruler will print undersized.
Why a PDF instead of the on-screen builder?
PDF page geometry is defined in physical units (points), so a PDF viewer's print pipeline reproduces it at true scale automatically — there's no screen-DPI guesswork involved, unlike measuring directly against a laptop or phone display.
Need a fixed length like 15cm or 30cm instead, or an inch scale? Browse the other ready-made PDF rulers, or use the custom ruler builder for anything else.