Music manuscript paper, A4
Blank staves on A4, the manuscript standard everywhere Letter is not, and a size worth matching rather than approximating.
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The extra height is a whole system
A4 is about 20 mm taller than Letter, which at normal stave sizes is one more system on the page. That is not a trivial difference for music: copying a piece laid out for A4 onto Letter reliably strands the final system, and a part with an orphaned last line is the kind of thing that causes a fumble in performance. Publishers specify the sheet for this reason.
Rastral size, not line spacing
What engravers specify is rastral size, the height of the whole five-line stave from bottom line to top. The traditional numbers run from No. 0 at about 9.2 mm down to No. 8 at about 3.7 mm. The spacing control here sets the gap between adjacent lines, so multiply by four for the stave height: 2.5 mm gives a 10 mm stave, generous and comfortable to write on.
How many staves
Twelve staves on A4 is the usual ruling for general-purpose manuscript. Ten or fewer suits vocal writing and sketching, where you need room for text beneath the notes. Sixteen and above is full-score territory, where you are already writing small. Set the spacing to control this rather than trying to cram, cramped noteheads are the main reason handwritten parts get misread.
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.