Do Warzone kills affect your KDR?

Games Halo 5: Guardians
1

I looked at my KD, and I feel like it doesn’t accurately reflect what I thought my KD was, since I don’t do so well in Arena. So do kills in Warzone affect KD? Are there separated statistics for both?

2

If you look at your overview page it will show your KD for the whole game - arena, slayer, warzone etc etc.

So for you, Total KD is: 1.713 (Kills - 752 Deaths - 439).

Each playlist has their own KD stat page.