Checklist paper, A4
The same checklist ruling on A4, the standard sheet everywhere outside North America. Slightly taller and narrower than Letter, so you get a couple more rows and a little less width.
Opens with these settings already loaded. Change anything you like, then download as PDF, PNG or SVG.
A4 gives you more rows and a narrower line
A4 is 297 mm tall against Letter's 279, and 210 mm wide against 216. At 9 mm rows that is 30 items per sheet against Letter's 28, with each writing line roughly 6 mm shorter. Neither difference matters for a shopping list. It matters if you are filing the sheet in a European ring binder or handing it to someone who will photocopy it, because a Letter original on an A4 copier loses the bottom of the page.
Print it at 100%, not "fit to page"
If your printer is loaded with Letter and you print this A4 sheet, the driver will offer to shrink it to fit. Accepting is what turns 9 mm rows into 8.5 mm rows. For a checklist the consequence is cosmetic rather than serious, unlike a measured grid, but the habit is worth keeping since the same dialog handles both. The calibration page tells you what your printer is actually doing.
Two-hole and four-hole filing
European binders punch two holes at 80 mm centers, and the default 10 mm margin here is not enough clearance for them. If the sheet is going into a binder, raise the margin to around 20 mm, which shifts the checkboxes clear of the punch line. Worth doing before you print fifty copies rather than after.
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.