Dot grid paper, A3
Five millimeter dots on A3, for work that needs to be seen whole rather than scrolled.
Opens with these settings already loaded. Change anything you like, then download as PDF, PNG or SVG.
Large format changes what the grid is for
On A5 a dot grid is a writing guide. On A3 it becomes a layout tool. The sheet is big enough to hold a project plan, a mind map, a wireframe set or a term timetable in one view, and the dots keep the whole thing aligned without ruling lines that would compete with the content. Anything you need several people to look at simultaneously wants this size.
Dots over lines when the content is the point
A line grid on a sheet this large is visually loud, and once you add boxes and arrows the page becomes hard to read. Dots give the same alignment and then get out of the way. Lighten them further if you are working in fine pen, because at A3 viewing distance you need less grid than you think to keep things straight.
Getting A3 printed
Home printers rarely go past A4, but A3 is standard at any print shop and in most offices. If you cannot get A3, printing the same grid across two A4 sheets and taping them is a real option for planning work, and the seam matters less than you would expect once the page is covered. Do not scale A3 artwork down to A4, since that shrinks the spacing to about 71% of what you set.
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.