[GiGaBiTe]

Originally Posted by squeek.

This should be mostly accurate I believe: https://developer.valvesoftware.com/wiki/Dimensions

They aren't.

All Quake lineage engines are 1 unit = 1 inch, you can even see it in the compile tool debug output.

Whoever made those measurements were confused about the player height being scaled to match the world instead of the other way around.