The formula to convert between font units and device units is based on a scale which is:
point size * resolution / ( 72 points per inch * units per em )
point size is what you use in your word processor, for example you add a line of text with font size 12
resolution is what your screen, printer, or other output device supports
units per em is set inside the font, as shown on the General tab at the Font Properties dialog
So on a 600 dpi laser printer, a 12 point glyph would have this scale (12 * 600) / (72 * 2048) = 0.048828125
So if your Latin capital letter H is 1600 units high, it will be 1600 * 0.048828125 = 78.125 pixels high on your printer.
If think if you only need to know the size in inches you can use this formula:
letter height * point size / ( 72 points per inch * units per em )
I just printed a huge “H” on my laser printer. Within Word I used font “Times New Roman” with font size “500”. Internally the height of the H is 1356 units. I measured the printer H and it is 4.59 inches in height.
The formula confirms this as:
1356 * 500 / ( 72 * 2048) = 4.60 inches
Hope this help.