The title says it all, I went through the process of rating characters from the low kage level to one level above high kage ordered from strongest at the top and weakest at the bottom.
Beyond Conventional kage level
Kabuto Yakushi [WA, no ET]
Naruto Uzumaki [WA KCM]
Minato Namikaze [Alive] / Itachi Uchiha [Edo / Alive plus healthy]
Obito [Yellow mask no ninetails / Orange mask]
Killer Bee [BM]
Tobirama Senju [Edo]
Pain (Six Paths) [PA]
High Kage
Hanzo of the salamander
Orochimaru with P1 ET
Naruto Uzumaki [SM] / Sasuke Uchiha [FKS Danzo fight]
Itachi Uchiha [Sick]
Ay (3rd) [WA, no jar]
Jiraiya / Orochimaru [P1, no ET] / Mu [WA] / Gengetsu Hozuki [WA]
Hiruzen Sarutobi [Old]
Onoki [WA]
Fourth Mizukage
Danzo Shimura [no Koto]
Sakura Haruno [WA]
Tsunade Senju [WA]
Fourth Raikage A
Mid Kage!
Might Guy [WA, 7G] / Kakashi Hatake [WA]
Kisame Hoshigaki
Gaara [WA]
Hebi Sasuke
Naruto Uzumaki [V2 four tails] / V2 four tails fight Orochimaru / Base Jiriaya
Sasori
Deidara
Third Kazekage
Rasa
Kakazu
Konan
Gamabunta / Manda / Katsuyu
Low Kage
Mei Terumi [WA]
Kakashi Hatake [PA]
Bos Sasuke
Chiyo
Darui
Mifune
Hidan
Beyond Conventional kage level
Kabuto Yakushi [WA, no ET]
Naruto Uzumaki [WA KCM]
Minato Namikaze [Alive] / Itachi Uchiha [Edo / Alive plus healthy]
Obito [Yellow mask no ninetails / Orange mask]
Killer Bee [BM]
Tobirama Senju [Edo]
Pain (Six Paths) [PA]
High Kage
Hanzo of the salamander
Orochimaru with P1 ET
Naruto Uzumaki [SM] / Sasuke Uchiha [FKS Danzo fight]
Itachi Uchiha [Sick]
Ay (3rd) [WA, no jar]
Jiraiya / Orochimaru [P1, no ET] / Mu [WA] / Gengetsu Hozuki [WA]
Hiruzen Sarutobi [Old]
Onoki [WA]
Fourth Mizukage
Danzo Shimura [no Koto]
Sakura Haruno [WA]
Tsunade Senju [WA]
Fourth Raikage A
Mid Kage!
Might Guy [WA, 7G] / Kakashi Hatake [WA]
Kisame Hoshigaki
Gaara [WA]
Hebi Sasuke
Naruto Uzumaki [V2 four tails] / V2 four tails fight Orochimaru / Base Jiriaya
Sasori
Deidara
Third Kazekage
Rasa
Kakazu
Konan
Gamabunta / Manda / Katsuyu
Low Kage
Mei Terumi [WA]
Kakashi Hatake [PA]
Bos Sasuke
Chiyo
Darui
Mifune
Hidan