Hit Points - Max HP and Hit Dice for D&D

A hit points calculator turns the level-up math from the D&D fifth edition rules into a single number, so building a character at session zero or leveling up mid-campaign takes seconds. Pick the class, level, Constitution modifier, and any racial or feat bonuses, and the calculator returns the maximum HP and the hit dice pool.

• • Building a new character: Get the right starting HP without applying the maximum-of-the-die rule and the Constitution modifier manually.
• • Leveling up: Roll or take the average for each new level in one step, instead of tracking partial sums.
• • Comparing two classes: Switch between Fighter and Barbarian, or Wizard and Sorcerer, and see the d10 vs d12 hit die trade-off at the same level.
• • Planning a Tough or Hill Dwarf dip: Toggle the bonuses to see how much extra HP they add before you spend an Ability Score Improvement.

Hit points matter at every level of D&D 5e. They decide whether your character survives a crit and how much healing a spell needs to deliver. The math is simple once you see it, but it is easy to forget a bonus or double-count the Constitution modifier, which is where this calculator earns its place at the table.

The result panel gives you max HP, level 1 base, level-up HP, and total feat plus racial bonus, and the same screen shows the hit dice pool in plain dice notation, ready to copy onto your character sheet.

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The hit points calculator reads the class to pick the hit die, sets the level 1 starting HP from the maximum face of that die, and adds the average die roll plus the Constitution modifier for every level beyond 1. Toggle the Tough feat, the Hill Dwarf racial trait, or the Draconic Bloodline sorcerer bonus on or off to see each bonus land in the result panel.

• die_max: 6 for Sorcerer or Wizard, 8 for the seven d8 classes, 10 for Fighter, Paladin, or Ranger, 12 for Barbarian.
• con_mod: (CON score - 10) divided by 2, rounded down. Negative values subtract from every level.
• avg_die: Average face rounded up: 4 for d6, 5 for d8, 6 for d10, 7 for d12.
• tough_bonus: 2 HP per character level if the Tough feat is enabled, otherwise 0.
• dwarf_bonus: 1 HP per character level if the character is a Hill Dwarf, otherwise 0.
• draconic_bonus: 1 HP per Sorcerer level if the Draconic Bloodline sorcerer flag is enabled, otherwise 0.

Every level of D&D 5e contributes the same kind of term: one hit die plus the Constitution modifier. The level 1 row is special because the SRD lets a new character take the maximum face of their die. For levels 2 and up the calculator averages the die so the result is reproducible.

According to Wizards of the Coast D&D 5e SRD v5.2.1, each class has a fixed hit die, and a character's hit points at level 1 equal the maximum face of that die plus their Constitution modifier.

If you write your character sheet as plain text in a notes app, the same ASCII converter you use for stat blocks is a good place to drop the hit dice pool line this tool generates.

Four ideas hold the whole hit points system together. Knowing them makes every result from this calculator easier to apply, and they explain why a hit points calculator can summarize the rules in a single result.

Once you can name these four ideas out loud, the SRD's hit points section becomes easier to read. Every bonus or feat in this calculator adds to one of those four ideas without changing the others, which is why the results line up with any character sheet you fill in by hand.

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Six steps take you from an empty form to a finished max HP and hit dice pool. Make sure every box reflects your character.

1. 1 Pick the class: Choose the class you are playing. The hit die size is shown next to each option.
2. 2 Set the level: Type the character's total level from 1 to 20. The result updates as soon as you change the number.
3. 3 Add the Constitution modifier: Pick the value that matches your CON score. A 14 Constitution is a +2 modifier; a 6 is a -2 modifier.
4. 4 Choose the roll mode: Leave it on Average (rounded up) for a stable total you can copy to your character sheet.
5. 5 Toggle racial and feat bonuses: Set Has the Tough feat, Is a Hill Dwarf, or Draconic Bloodline sorcerer to Yes if your character qualifies.
6. 6 Read the result panel: The Maximum hit points field is the headline number. The breakdown rows show where each point came from.

Picture a fourth-level Ranger with a 14 Constitution who just picked the Tough feat at level 4. Pick Ranger, set Level to 4, Constitution modifier to +2, leave Roll mode on Average, and set Has the Tough feat to Yes. The hit points calculator then shows Max HP 49, hit dice pool 4d10, and a full breakdown of where each point came from.

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Five concrete payoffs show why this calculator belongs on your session prep screen, and why a hit points calculator is the most direct way to keep every character on the same page at session zero.

• • Faster character creation: Drops a 1st-level or 5th-level build from a five-minute math exercise to a single click.
• • Fewer leveling mistakes: Surfaces the Constitution modifier and racial or feat bonuses in the same result panel.
• • Easy class comparison: Switch the class dropdown to compare single-class options and see where the d8 vs d10 hit die trade-off lands.
• • Visible hit dice pool: Shows the pool in NdX notation alongside the maximum HP, so you can spend hit dice without re-reading the SRD.
• • Reproducible averages: Uses the SRD average-roll rule by default, which makes character builds comparable across players.

The biggest payoff is consistency. Two players building the same class and level should always get the same number from this calculator, which removes a small but real source of arguments at session zero, and the visible breakdown shows where a +2 Constitution modifier is doing the most work.

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Five factors drive the final number. Knowing how each one enters the calculation makes it easy to debug a result that looks off, which is the main reason to keep this hit points calculator open while you level a character up.

• • Covers a single-class character. Multiclass HP rules are described in the article so you understand the math, but the form returns the single-class total.
• • Returns maximum hit points, not current hit points. Tracking current HP, healing, and death saves is up to your character sheet or VTT.
• • Some tables cap HP at 1 for level 1 characters with a negative Constitution modifier. The calculator returns the true arithmetic total instead, so check with your DM if you are below 1 HP.

When the result looks low, check the Constitution modifier and the Tough feat, since both add HP at every level. When it looks high, check the class and level: a level 20 Barbarian with a +5 Constitution and Tough crosses 300 HP, which catches new players off guard.

According to Wikipedia: Health (game terminology), hit points were coined by D&D co-creator Dave Arneson, and D&D 5e uses hit dice so each level rolls a class-specific die plus the Constitution modifier.

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