I am actually having a difficult time figuring this out with certainty. I am relatively new to KiCAD. Metric units have been selected in my preferences.
I have selected various 0603, 0805, etc., sizes for my passive components from the KiCAD component libraries. I have even soldered such components before by hand, but never paid much attention to their actual dimensions.
But I need clarification if these sizing references are in metric or imperial units. The component library in KiCAD does not seem to offer a clear answer, and I am having trouble figuring this out, because I cannot even find a simple specification for a 0603 footprint (metric or imperial) via Google search.
If someone could set me straight, I would appreciate it. I am using KiCAD 4.0.2 (stable) on a PC running Ubuntu.