TheoryCraft is a Wow addon that enchants your spell tooltips with additional information such as the real damage calculation for a target. It calculates your spell power and the target's resistance to give you an exact number. The addons will also display the DPS and crit for the spell.
Use the /tc command to view and change the options.
Download TheoryCraft for Wow Vanilla (1.12.1)
- Download TheoryCraft
- Unpack the Zip file
- Copy TheoryCraft into Wow-Directory\Interface\AddOns
- Restart Wow