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Hi, Its purely depends upon your screen pixel size, for printer it is depends on your print pixel resolution (dpi's).
For your Information:
A4 size is precisely 210mm x 297mm.
and in inches it is: 8.2677 in x 11.6929.
which means 210mm or 8.2677inch width. and if your screen resolution is 600 pixels per inch then you need to set the form width to 4960 pixel.
Hope this information Helps you.