Originally published June 24th 2024
In 5e HD is determined by size. Tiny is 1d4, small 1d6, medium 1d8, large 1d10, huge 1d12, and gargantuan is 1d20. I think that works wells.
For those unaware of what those categories include here is a plain english explanation.
Tiny = Garden gnome
Small = 5 year old
Medium = Adult
Large = Horse
Huge = Elephant
Gargantuan = Orca
This is all.