How this calculator works
At first level a character gets the maximum value of the class hit die plus the Constitution modifier. At each later level the rules offer a fixed average instead of a roll: half the hit die plus one, again plus the Constitution modifier. A level can never add less than one hit point in total, so a very low Constitution modifier is floored. Multiclassing gives the starting class its maximum die only at character level 1; every multiclass level uses the average of that class's die. Features then add on top: a hill dwarf gains one hit point per character level, the Tough feat gains two, and a draconic sorcerer gains one per sorcerer level. The maximum and minimum columns show what the same build would have if every level-up die were rolled high or low.
Formula
first level = hit die maximum + Constitution modifier. each later level = hit die / 2 + 1 + Constitution modifier, with a minimum of 1. Multiclass levels each use their own class die and the same average rule. Add 1 per character level for a hill dwarf, 2 per character level for Tough, and 1 per sorcerer level for Draconic Resilience.
Worked example
A level 5 fighter with a Constitution modifier of +2 starts with 10 + 2 = 12 hit points. Each of the four later levels adds 5 + 1 + 2 = 8, for 32 more, giving 44 hit points. The same character as a hill dwarf has 49, and with the Tough feat as well has 59. A level 10 wizard with +2 Constitution has 6 + 2 = 8 at first level plus nine times 4 + 2 = 6, for 62 hit points.
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Frequently asked questions
Should I use the average or roll for hit points?
The average is the default in organised play and is what most tables use because it avoids a unlucky string of low rolls. Rolling can give more or less; the maximum and minimum columns show the possible range for the same build. Your table's rule decides which one applies.
Do I add my Constitution modifier at every level?
Yes. The modifier is added to the hit points gained at every level, including multiclass levels. If your Constitution modifier increases later, the rules also add the new modifier retroactively to every level already taken.
How does multiclassing change first-level hit points?
Only your starting class gets the maximum die at character level 1. When you take a level in a new class, you gain that class's average hit points, not its maximum. This page follows that rule.
Do Hill Dwarf and Tough stack?
Yes. Both add hit points per level and neither replaces the other. A hill dwarf with the Tough feat adds three hit points per character level on top of the class and Constitution totals.