Graph paper, B5
Five millimeter squares on B5, the size between A5 and A4 that dominates Asian stationery.
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ISO B5 and JIS B5 are not the same size
This catches people out and is worth checking before you print. ISO B5, the European standard and the one used here, is 176 by 250 mm. JIS B5, the Japanese industrial standard, is larger at 182 by 257 mm. Japanese notebook brands such as Kokuyo and Hobonichi use JIS, while European brands such as Leuchtturm1917 and Rhodia use ISO. A sheet printed to ISO B5 will sit slightly small inside a JIS B5 notebook, by about 6 mm across and 7 mm down.
Why B5 exists at all
The B series sits between the A sizes: B5 is larger than A5 and smaller than A4. That turns out to be a comfortable writing size, big enough for real work and small enough to carry, which is why it became the default for school and university notebooks across much of Asia and remains common in Europe for softcover books. It has never caught on in North America, where the equivalent slot is filled by Half Letter.
Making it fit your notebook
If you are printing inserts for a specific notebook, measure the page rather than trusting the label, then use the custom size in the generator. Set the margin generously if the notebook is bound rather than loose-leaf, because the inner edge disappears into the gutter and a grid that runs into the binding is a grid you cannot write on. For loose-leaf, print two B5 sheets on one A4 page and trim.
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.