D&D Hit Points Calculator
Calculate your D&D 5e total hit points by class, level, and Constitution modifier.
Uses official 5e average hit die rules for levels 2 and beyond.
How Hit Points Are Calculated in D&D 5e
At level 1, you always take the maximum value of your class’s Hit Die. At every level after that, you either roll your Hit Die or take the average (rounded up).
Most players (and most online play) use the fixed average because it is reliable and fair.
Formula (Using Fixed Average)
HP = (Max Hit Die + CON Modifier) + (Average Per Level + CON Modifier) × (Level − 1)
Note the CON modifier appears in both halves. Level 1 gets it too, and dropping it there is the single most common mistake in hand-rolled HP maths.
Hit Die by Class
| Hit Die | Classes | Max | Average |
|---|---|---|---|
| d12 | Barbarian | 12 | 7 |
| d10 | Fighter, Paladin, Ranger | 10 | 6 |
| d8 | Artificer, Bard, Cleric, Druid, Monk, Rogue, Warlock | 8 | 5 |
| d6 | Sorcerer, Wizard | 6 | 4 |
The average is the die’s midpoint rounded up: d12→7, d10→6, d8→5, d6→4.
Constitution Modifier
Your CON modifier is added to every level’s HP gain. A CON modifier of +3 gives +3 HP at level 1 and +3 HP at every subsequent level, so it compounds hard. Over 20 levels that one modifier is worth 60 hit points.
Example
A level 10 Paladin (d10) with CON modifier +2: Level 1 gives 10 + 2 = 12. Levels 2 through 10 are nine more levels at (6 + 2) = 8 each, so 72. HP = 12 + 72 = 84 HP.
Rolling instead of averaging
You can roll the die at each level up if your table allows it. The maths is identical, you just swap the fixed average for whatever you rolled. Rolling has a higher ceiling and a much worse floor: a d6 Wizard who rolls badly through the teens can end up 15 or more hit points behind the average, which at that class is close to a full level’s worth of survivability. Some tables let you re-roll 1s, some let you take the average if the roll is lower. Ask before you commit, because the choice is not reversible.
What this calculator leaves out
Plenty of things add hit points on top of the class formula. The Tough feat is the big one, +2 HP per character level, which is +40 at level 20. Hill Dwarves get +1 per level from Dwarven Toughness. A Draconic Sorcerer gets +1 per level as well. Raising your Constitution score mid-career is the subtle one, because a CON increase is applied retroactively to every level you already have, not just the ones ahead of you. Going from CON 14 to CON 16 at level 8 is worth +8 hit points on the spot, not +1.
Multiclassing works level by level: take your first class’s maximum die at character level 1, then the average of whichever class’s die you gained on each level after. This calculator assumes a single class.
How we build and check this calculator
This calculator runs entirely in your browser, so the numbers you enter stay on your device. The math behind it is written by hand and tested against worked examples and standard references before the page goes live.
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