Lined paper, A5
Seven-millimetre ruling on A5, the spacing most notebooks sold as "ruled" actually use.
Opens with these settings already loaded. Change anything you like, then download as PDF, PNG or SVG.
Refills and inserts
Printing your own A5 ruled paper earns its keep in two situations: a notebook that has run out of the ruling you want, and a dot grid or blank journal where you want lined sheets for one long stretch of prose. Because the PDF prints at true size, the sheets you add match the ones already bound in rather than being subtly narrower or wider spaced.
Two up on A4, cut once
A5 is exactly half of A4, so two pages print side by side on a single A4 sheet at 100% and separate with one straight cut. Nothing is scaled and nothing is wasted. For filling a ring binder or a traveller's notebook insert this is the cheapest possible route to forty pages, and the cut line falls on the fold if you would rather fold than guillotine.
Line count and the binding edge
At 7 mm an A5 page holds about 36 lines inside sensible margins, or 30 with a generous head and foot. If the sheets are being punched or stitched into a signature, raise the margin on the binding side to about 15 mm before downloading. On a page this small, a binding that eats into the text block is far more noticeable than the same loss would be on A4.
Printing it accurately
This only measures correctly if your printer doesn't rescale the page. In the print dialog set Scale: 100% — not "Fit to page" or "Shrink oversized pages". If you're not sure it worked, print the calibration page, measure the ruler on it with a real ruler, and it will tell you exactly what your printer is doing to the page.