The "font size" of a font refers to the font's "em height", which isn't necessarily the same as the height of particular characters in the font.
Usually the em height of a font adheres to the same basic idea - it'll be roughly set to the distance from the lowest descender (such as the bottom of the letter
g) to the highest ascender (such as the top of the letter
When I do my drawing templates, I set my font height to Points (72 pts. per inch).
Easiest would be to get the point setting used in Catia. Also make sure you are using the same font!
From SolidWorks Help:
Lists the value as the actual height of the tallest character in the font set.
Lists the font height which includes ascenders and descenders, so the character size is smaller than the corresponding character when measured in Units.
When you do Choose Font and pick 72 pts. (1") as the size you will see the equivalent Units is 0.75"
Thanks for the pointer (see what I did there!), I've tried looking for a point setting in Catia, but it only seems happy with a measured input.
I've given up now and just fudging it by eye, can't believe 2 CAD packages would approach the size of text in different ways? If one is correct, surely they're must be companies on the other system who've not got the correct sizes set as per BS8888?
Even in Word, PowerPoint, etc. different fonts show up at drastically different actual size for the same specified font size. I'd recommend using Century Gothic, as (at least on my system) it is very close to the size in mm that you set.