Dot grid paper, A6
A6 is 105 × 148 mm — a quarter of A4, and the size of a pocket Moleskine or Leuchtturm.
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A pocket page holds one idea
At 5 mm spacing there are about seventeen dots across an A6 page, which is roughly eight or nine words of ordinary handwriting to a line. That constraint is the point rather than a limitation: an A6 page is the right size for a single list, a single sketch or a single thought, and much too small for one to sprawl into three. Pocket notebooks work because the page ends.
Four to a sheet
A6 is a quarter of A4 and an eighth of A3, so four pages print on one A4 sheet at 100% using your driver's four-up setting, and cut cleanly along the folds. There is no waste and no rescaling — the practical advantage the A series has over inch-based sizes, where halving a sheet rarely produces another standard size.
Go coarser, not finer
The instinct on a small page is to tighten the spacing to fit more in. It usually backfires, because handwriting does not shrink to match the paper, and 3 mm dots under normal-sized writing read as grey noise rather than as guides. If anything, move to 6 mm on A6. Fewer and clearer dots, and slightly less on the page, is the better trade at this size.
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.