Your kill/death ratio and KDA - plus exactly how many kills you need to hit a target K/D. Free, no signup.
K/D ratio = kills divided by deaths. A K/D of 1.0 means you get one kill for every death. KDA adds assists: (kills + assists) / deaths.
Around 1.0 is average; above 1.5 is strong in most competitive shooters. It varies a lot by game and role.