Lined paper, A3
Ten millimeter ruling on A3, sized for writing that other people need to read from across a room.
Opens with these settings already loaded. Change anything you like, then download as PDF, PNG or SVG.
Writing to be read at distance
A3 ruled paper is not for personal notes. It is for flip charts, workshop output, classroom display, and any situation where several people have to read the same page at once. The 10 mm ruling is deliberately generous because handwriting that is legible at arm's length is not legible at three meters, and the usual failure of a hand-written flip chart is that the writer sized it for themselves.
Also an accessibility size
The same sheet serves anyone whose handwriting is large by necessity rather than choice: young children, people with tremor or reduced dexterity, and people with low vision who need the guide lines far enough apart to distinguish. Lighten the line color as well as widening the spacing, since a heavy rule competes with the writing for the same visual attention.
Getting A3 printed
Home printers rarely go past A4. A3 is standard at print shops and in most offices, and for flip chart use you are usually printing a stack anyway, which makes a shop run worth the trip. If you cannot get A3, two A4 sheets taped together works for workshop output where nobody is going to file it afterwards. Do not scale A3 down to A4, since that takes the 10 mm ruling to about 7 mm and defeats the point.
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.