Damage Calculator is an in-game Mythic+ planning addon that estimates how much damage a specific dungeon spell will deal to your character after defensives, externals, buffs, armor, and versatility are applied.

What it does

Lets you pick a dungeon and browse/search spells by name or spell ID.
Filters spells by Tankbuster, Avoidable, and Trivial.
Supports keystone levels +2 to +30.
Handles affix logic automatically: toggle Fortified/Tyrannical at +7 to +9, both active at +10+.
Provides mitigation panels for Defensives, Externals, Group Buffs, and Group Actives.
Supports ranked mitigation entries (right-click to cycle rank where applicable).
Uses your Versatility, Avoidance and Armor to adjust results.
Shows a full result breakdown: Base Health, Effective Health, Base Damage, Final Damage, Remaining Health, plus mitigation/absorb details.
Accounts for spell damage variance: the displayed number is the upper bound (worst-case roll), so actual hits may be lower.

Supported dungeons

Algeth'ar Academy
Magisters' Terrace
Maisara Caverns
Nexus-Point Xenas
Pit of Saron
Seat of the Triumvirate
Skyreach
Windrunner Spire

How to open

Use /dc or /damagecalculator in chat.