Hit dice by class
| Hit die | Classes | Fixed value | Average roll |
|---|---|---|---|
| d6 | Sorcerer, Wizard | 4 | 3.5 |
| d8 | Bard, Cleric, Druid, Monk, Rogue, Warlock | 5 | 4.5 |
| d10 | Fighter, Paladin, Ranger | 6 | 5.5 |
| d12 | Barbarian | 7 | 6.5 |
Pick your die above, set your Constitution modifier, and roll.
Roll or take the average?
At 1st level you get the die's maximum. After that, each level you either roll the hit die or take the fixed value, then add your Constitution modifier either way.
The fixed value is half a point better than the average roll, so over a career it wins. Rolling is for people who like the gamble: a barbarian can roll a 12 or a 1. Many tables pick one rule for everybody.
Hit dice on a short rest
You have as many hit dice as your level. On a short rest you can spend some, rolling each one and adding your Constitution modifier to heal that much. A long rest gives back half of them.