Kaido's HP Progression so far
Before the announcement of the Raid: 100%
The Raid: 99.96%
Rooftop before scabbards: 100%(healed)
After Scabbards: 94% (4% is attributed to Oden PTSD)
Big Mom Kaido reunite: 97%(Healing in progress)
NG vs Yonko Face-off: 99.99%
After Red Roc: 99.41%
After Haki-less One Giri and Killer: 98. 70%
After Auction House Trio Tag Team: 99.00% (Healing)
After Luffy, Law, Kid, Killer tag team: 98.70
After Luffy G4 attacks: 98.65%
After missed Zoro Hiryu Kaen scare: 92% (He huffs for a moment) but he returns back 98.36%
After g4 Gattling: 97.30%
After Zoro's Tatsumaki: 89%-91%
1009: 94% (Takes no damage;Recovers)
After Injection shot: 93.10%
After Extremely Nerfed Asura: 44%-53%
After Luffy's CoC Punches: 42.40%
Defeats Luffy and Recovers HP: 43.2%
Now he's been hovering in the 40's ever since