Have you ever been in a party or raid and half the group dies, and you wonder what the chances are of succeeding with what you have left? I have. I've developed a basic addon that analyzes group and enemy collective health and calculates your chance of winning. I call it WinChance. This also works for solo combat, so you can see what your chances are against an elite in the open world.
/winchance for options (can also right click frame)
Please comment any issues or errors that you find. Please also comment any improvements you want to see or suggestions to make it a better addon.
/winchance lock - Lock and unlock the window