Choosing a footprint in KiCad?
In CvPcb there is the "View selected footprint" in the top toolbar.



Once you press that button, a new window pops-up where you can see your footprint.



This new window allows you see the component and has a grid from which you can find out the size of your component. This grid is also selectable by right-clicking the grid and choosing whatever grid you want from "Grid Select" option.



If you mouse-hover on one pin, on the bottom of the window there are X-Y coordinates from which you can tell the distance between the pins. This one, from the example, has 5.08mm * 2 = 10.16mm = 0.4inches distance between the pins.