Union Raid Boss HP Calculator

Use this calculator to estimate remaining boss HP after up to three player damage inputs. Select a level and boss, enter damage values, then run the calculation.

Data source: boss HP values are loaded from boss.json on this site.

How to Use

Select the raid level and boss.
Enter damage for Player 1 and Player 2.
Enter Player 3 damage, or enable Ignore Player 3.
Click Calculate to see remaining HP and bar visualization.

Level:

Boss:

Player Damage:

Player 1:

Player 2:

Player 3:

Ignore Player 3?

Remaining HP: 0

Quick FAQ

Q: Why does the level dropdown start at 1 even though internal values are zero-based?
A: The UI displays level +1 for readability while using the underlying dataset keys.

Q: Can this be used without a third player hit?
A: Yes. Enable Ignore Player 3 to calculate using two players only.