You can find some calculators to get vertical from horizontal using google, e.g. *shrug* look very much like the mathematics program I made them in.Ġth of all: To everyone that already knows about what FoV value (s)he prefers: CryEngine uses a vertical FoV value, many other FPS use(d) a horizontal FoV value. Well I thought why not make some nice pictures about what FoV actually is. Edit: Follow-up topic on 'wrong' but more immersive values for FoV: The Lies about FoV