I don't know if people play BO2 Zombies Still but this is a spreadsheet I made that automatically calculates your Kills to Downs ratio in Zombies. Most of it is pretty self-explanatory. Try it out if you want and let me know what you think!
Requires Microsoft Excel
Download Link: http://www.mediafire.com/view/s2w4sdladldlfi6/BOII_Zombies_KillDeath_Calculator_ (Blank).xlsx