5e hp calculator - Aaron Graves, PhDude Replica

D&D 5e Hit Point Calculator

Calculate maximum hit points for a single-class 5e character. Choose average gains or enter your rolled values level-by-level.

Class Hit Die

Character Level (1-20)

Constitution Score Con modifier: +2

HP Gain Method (Levels 2+)

Rolled HP values for levels 2+ (comma-separated) Enter one roll per level after 1st. Values must be between 1 and your hit die.

Include Tough feat (+2 HP per level)

Other flat HP bonus per level Examples: Draconic Resilience (+1), Hill Dwarf Dwarven Toughness (+1). Use 0 if none.

How 5e Hit Points Work

In Dungeons & Dragons 5th Edition, your hit points are based on your class hit die, Constitution modifier, and level progression. At level 1, you always start with maximum value of your class hit die. At each level after that, you either roll your class hit die or take the fixed average shown in your class table.

This calculator follows core 5e rules for a single-class character and gives you a clean HP estimate with a breakdown so you can verify every number.

Level 1 HP Formula

Level 1 HP = Max Hit Die + Constitution modifier + bonuses per level
If your total would be below 1, the result is treated as 1

Levels 2 and Up

Average method: gain (half die rounded down + 1) each level, plus your modifiers
Rolled method: gain your rolled die result each level, plus your modifiers
Minimum HP gained on level-up is 1

What This Calculator Includes

Class hit die options (d6, d8, d10, d12)
Constitution score to modifier conversion
Average or rolled HP level-up method
Tough feat toggle (+2 HP per level)
Custom flat bonus per level for features like Hill Dwarf or Draconic Bloodline
A full formula breakdown so you can audit the final number

Example Builds

Example 1: Level 5 Fighter, Constitution 16, average HP

A fighter uses a d10 hit die. Constitution 16 gives a +3 modifier.

Level 1: 10 + 3 = 13
Levels 2-5 average gain: 6 + 3 = 9 each
Total: 13 + (4 × 9) = 49 HP

Example 2: Level 8 Wizard, Constitution 14, Tough feat

A wizard uses a d6 hit die. Constitution 14 gives +2. Tough adds +2 per level.

Per-level bonus from CON + Tough = +4
Level 1: 6 + 4 = 10
Levels 2-8 average gain: 4 + 4 = 8 each
Total: 10 + (7 × 8) = 66 HP

Common HP Mistakes Players Make

Forgetting max hit die at level 1 (you do not roll level 1 HP)
Using Constitution score instead of Constitution modifier
Forgetting to add Tough every level, not just once
Mixing average and rolled values without tracking level-by-level
Confusing temporary HP with maximum HP

FAQ

Does this include temporary hit points?

No. Temporary HP is tracked separately and does not increase your maximum HP.

Does this handle multiclass characters?

This version is designed for single-class characters. For multiclass builds, calculate each class level segment separately and combine totals.

Can HP gained from level-up ever be zero or negative?

No. When leveling, the minimum HP gain is 1 in 5e.

Final Thoughts

If you want faster character prep, consistent level-up math, and fewer in-session errors, a dedicated 5e HP calculator is one of the easiest quality-of-life tools you can use. Plug in your values, check the breakdown, and get back to planning your next encounter.