Jon wrote: Inkscape is an SVG app, and does things "SVG-style".
One of the interesting things is that SVG follows CSS size rules in that things are based on display units that may change. By default things are set to use an assumed 90 DPI value. The difference between 72 DPI and 90 DPI gives you the 4/5ths factor you're seeing.
In general, try multiplying or dividing by either 80 or 1.25.
This is a bit of a tricky area, as I believe that once we change things to follow the specs even closer, it would entail getting the DPI from the runtime display environment (though if not done properly, things would quickly devolve into chaos) I would not use the word interesting and I'm certainly not going to mult or divide by a factor on all the different font sizes I use. I am making geological maps where there are lots of small titles, names, comments etc scattered over the map.
Can I change this default 90DPI to 72DPI display units anywhere? And if I can, is there anything else that that will screw up as a result? Line width etc.
Thanks, Erik