Drop chance calculator
Pick an item to see everything that drops it, how many kills that takes on average, and the chance of having it after a number of kills.
Each kill rolls every drop on its own: the chance times one plus your drop bonus (a Black Cat has +10%, and gear, kits and talents add more). Zone drops can come from any monster killed in that zone, on top of its own table. In a group, each cat rolls on its share of the kill. Higher dream tiers drop their own set pieces more often. "Kills an hour" is how many of that monster you kill: in a zone with several kinds, only some of your kills are the one you want.
Chances as written in the game: 25% chance, 1% chance, 1 in 10,000 and so on, the same as on every monster's wiki page.