PrintableRuler.onlineFull-Page US Letter Ruler — PDF Download
A cm/mm ruler that runs edge-to-edge across a single landscape US Letter sheet (about 25.9cm of usable length), built at exact physical scale in the PDF itself.
Paper: US Letter, landscape · 1 sheet · cm/mm scale
Before printing: open the PDF's print dialog, select US Letter 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 6in or 12in instead, or a metric scale? Browse the other ready-made PDF rulers, or use the custom ruler builder for anything else.